SEC Petition Evaluation Report

Petition SEC-00250 ER Addendum (1987–1994) 

Report Rev Number: Addendum (1987-1994)

Report Submittal Date: 06/23/2021

Subject Expert(s): Tim Adler, Joe Guido

Site Expert(s): N/A

Petition Administrative Summary

Petition Under Evaluation

Petition Number: SEC-00250 Addendum (1987–1994)

Petition Type: 83.13

Petition Receipt Date: November 1, 2018

Qualification Date: March 6, 2019

DOE/AWE Facility Name: Y-12

Petition Class

Petitioner-Requested Class 

Definition:

All workers who worked in any area of Y-12 where uranium was fabricated or 

processed from January 1, 1980, to December 31, 2000.

Class Evaluated by NIOSH: All employees of the Department of Energy, its predecessor agencies, and their 

contractors and subcontractors who worked at the Y-12 Plant in Oak Ridge, 

Tennessee that may have incurred thorium exposures, during the period from 

January 1, 1977 through December 31, 1994 for a number of work days 

aggregating at least 250 work days, occurring either solely under this employment 

or in combination with work days within the parameters established for one or 

more other classes of employees in the Special Exposure Cohort.

NIOSH-Proposed Class(es) to be 

Added to the SEC:

None for the period evaluated in the addendum (1987-1994)

Related Petition Summary Information

SEC Petition Tracking Number(s): SEC-00018

SEC-00028 

SEC-00098 

SEC-00186 

SEC-00250 

SEC-00251

Petition Type: 83.13

83.13 

83.14 

83.14 

83.13 

83.14

DOE/AWE Facility Name: Y-12 Plant

Y-12 Plant 

Y-12 Plant 

Y-12 Plant 

Y-12 Plant 

Y-12 Plant
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Petition Status: Class added to the SEC for March 1943 through December 31, 1947

Class added to the SEC for January 1948 through December 31, 1957 

Class added to the SEC for March 1, 1943 through December 31, 1947 

Class added to the SEC for January 1, 1948 through December 31, 1957 

Class added to the SEC for January 1, 1977 through July 31, 1979 

Class added to the SEC for January 1, 1958 through December 31, 1976 

Related Evaluation Report Information 

Report Title: SEC Petition Evaluation Report for Petition SEC-00018

SEC Petition Evaluation Report for Petition SEC-00028 

SEC Petition Evaluation Report for Petition SEC-00098 

SEC Petition Evaluation Report for Petition SEC-00186 

SEC Petition Evaluation Report for Petition SEC-00250 

SEC Petition Evaluation Report for Petition SEC-00251

DOE/AWE Facility Name: Y-12 Plant

ORAU Preparation and Review

ORAU Lead Technical Evaluator: Joe Guido

ORAU Peer Review Completed By: Patrick McCloskey

DCAS Review and Approval

Peer Review Completed By:

[Signature on File]

Lara Hughes 

June 22, 2021

SEC Petition Evaluation Reviewed By:

[Signature on File]

Timothy Taulbee 

June 22, 2021

SEC Petition Evaluation Approved By:

[Signature on File]

Grady Calhoun 

June 22, 2021
SEC-00250 ER Addendum 06-23-21 Y-12 Plant

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Addendum to the SEC-00250 Y-12 Evaluation Report

Purpose and Scope of this Addendum (1987–1994)

This Addendum evaluates the feasibility of reconstructing internal radiation doses from thorium at the 

Y-12 Plant in Oak Ridge, Tennessee, during a period left unevaluated in the SEC-00250 Y-12 

Evaluation Report (ER) [NIOSH 2019]. The SEC-00250 designated evaluation period is from January

1, 1977 through December 31, 1994; during ER development, the period 1987–1994 was reserved for 

later evaluation.

In the SEC-00250 ER, NIOSH defined a single class of employees for which NIOSH cannot estimate 

radiation doses with sufficient accuracy. This class included all employees of the Department of 

Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Y-12 

Plant from January 1, 1977 through July 31, 1979. NIOSH proposed this class because there was a 

lack of sufficient thorium-related lung count data for this period. Sufficient thorium data were 

available for the period from August 1, 1979 through December 31, 1986, thus making it feasible to 

estimate thorium dose for that period. In addition, the ER established that estimating dose from all 

potential uranium intakes, external radiation exposures, and medical X-rays was feasible for the entire 

period under evaluation (January 1, 1977 through December 31, 1994).

In the SEC-00250 ER, NIOSH left unevaluated the feasibility of estimating thorium internal exposure 

from January 1, 1987 through December 31, 1994 due to lack of post-1986 activity-based thorium 

progeny data. Since issuing the SEC-00250 ER, NIOSH has received post-1986 activity-based 

thorium progeny data from Y-12 (i.e., Ac-228 and Pb-212). This Addendum presents NIOSH’s 

analysis of these data and their applicability for estimating maximum potential internal thorium doses

from January 1, 1987 through December 31, 1994.
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Evaluation Report Addendum Summary: SEC-00250, Y-12 Plant

Class Evaluated by NIOSH (in this Addendum)

All employees of the Department of Energy, its predecessor agencies, and their contractors and 

subcontractors who worked in any area at the Y-12 Plant in Oak Ridge, Tennessee that may have 

incurred internal thorium exposures during the period from January 1, 1987 through December 31, 

1994.

NIOSH Determination about the Proposed Class to be Added to the SEC (in this Addendum)

Since the SEC-00250 ER was issued, NIOSH has obtained sufficient post-1986 occupational internal 

monitoring data. Based on its analysis of these data, NIOSH found no part of the class under

evaluation in this Addendum for which it cannot estimate maximum radiation doses with sufficient 

accuracy.

Feasibility of Dose Reconstruction

As previously identified in the SEC-00250 ER, NIOSH found it is not feasible to estimate internal 

thorium exposures with sufficient accuracy for all employees at the site from January 1, 1977 through 

July 31, 1979 [NIOSH 2019]. 

For the period from August 1, 1979 through December 31, 1994, per EEOICPA and 42 CFR 83.13(c) 

(1), NIOSH has established that it has access to sufficient information to: (1) estimate the maximum 

radiation dose, for every type of cancer for which radiation doses are reconstructed, that could have 

been incurred in plausible circumstances by any member of the class; or (2) estimate radiation doses 

of members of the class more precisely than an estimate of the maximum dose [42 CFR Part 83, 2018, 

PDF p. 10]. Information available from the site profile and additional resources is sufficient to 

estimate the maximum internal and external potential exposure to members of the evaluated class 

under plausible circumstances during the specified period.

The NIOSH dose reconstruction feasibility findings described in the SEC-00250 ER and this 

Addendum are based on the following:

• As previously identified in the SEC-00250 ER, NIOSH has determined that there are insufficient

in-vivo monitoring data for thorium (i.e., lung counts) during the period from January 1, 1977 

through July 31, 1979. Available thorium lung count data during this period are mass-based 

results. As such, NIOSH does not have the ability to use these data to determine the associated 

intakes of thorium-232, thorium-228, and radium-228 with sufficient accuracy. Thus, NIOSH 

cannot determine with sufficient accuracy the internal exposures from thorium lung measurements 

during the period from January 1, 1977 through July 31, 1979.

• As previously identified in the SEC-00250 ER, NIOSH has determined that there are sufficient 

in-vivo and in-vitro monitoring data for uranium (i.e., lung counts and urinalysis) during the period 

from January 1, 1977 through December 31, 1994 to allow NIOSH to determine the potential 

intakes of uranium with sufficient accuracy.
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• NIOSH has assessed the available calutron-cyclotron-related radioisotope data produced at Y-12

by the ORNL Isotopes Division, to determine if a dose reconstruction infeasibility exists [ORAUT 

2018a]. NIOSH has concluded that no dose reconstruction infeasibilities existed with the 

exception of Pu-241, which was addressed in the SEC-00251 ER. 

• As previously identified in the SEC-00250 ER, beta, photon, and neutron monitoring data are 

available for Y-12 in the form of individual dosimetry during the evaluation period from January 

1, 1977 through December 31, 1994. Consistent with its findings in prior NIOSH evaluations of 

the Y-12 Plant, NIOSH finds that there is sufficient monitoring and source term information 

available to reconstruct external and medical X-ray doses for all workers at the Y-12 Plant during 

the period from January 1, 1977 through December 31, 1994. 

Pursuant to 42 C.F.R. § 83.13(c)(1), for the period from January 1, 1987 through December 31, 1994, 

NIOSH has determined that there are sufficient activity-based Pb-212 and Ac-228 in-vivo monitoring 

data to allow NIOSH to determine with sufficient accuracy the associated intakes of Th-232, Th-228,

and Ra-228. Thorium-related doses from January 1987 through December 1994 (excluding January–

May 1992) can be bounded by using either: (1) the Ac-228 and Pb-212 lung count data retrieved from 

the Y-12 Electronic Record Keeping System (1987–1991); or (2) the Ac-228 lung count data retrieved 

from the Y-12 Electronic Record Keeping System in conjunction with the associated chest wall 

thickness (1992–1994).

Health Endangerment Determination (for this Addendum Period).

Per EEOICPA and 42 C.F.R. § 83.13(c)(3), a health endangerment determination is not required 

because NIOSH has determined that it has sufficient information to estimate dose for the members of 

the evaluated class [42 CFR Part 83, 2018, PDF p. 11].
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Revised Excerpts from the SEC-00250 Y-12 Evaluation Report

NOTE: From this point forward, this SEC-00250 Y-12 ER Addendum only addresses those sections 

that require discussion regarding the 1987–1994 period; therefore, the section numbering is not 

contiguous. When deemed helpful to the reader, additional ER text is sometimes included for context.

3.2 Class Evaluated by NIOSH

This Addendum presents conclusions from NIOSH’s evaluation of Y-12 thorium dose reconstruction 

feasibility for the period reserved for later evaluation in the SEC-00250 Y-12 ER (i.e., January 1, 1987 

through December 31, 1994) [NIOSH 2019]. 

3.3 NIOSH Determination about the Proposed Class to be Added to the SEC

Since issuing the SEC-00250 ER, NIOSH has obtained sufficient post-1986 occupational internal 

monitoring data to bound internal doses from thorium exposures. Based on its analysis, NIOSH found 

no part of the class under evaluation in this Addendum for which it cannot estimate maximum 

radiation doses with sufficient accuracy. 

4.0 Data Sources Reviewed by NIOSH to Evaluate the Class

As is standard practice, NIOSH completed an extensive database and Internet search for information 

regarding the Y-12 Plant. The database search included the Department of Energy (DOE) Legacy 

Management Considered Sites database, the DOE Office of Scientific and Technical Information 

(OSTI) SciTech Connect database, and the Hanford Declassified Document Retrieval System. In 

addition to general Internet searches, the NIOSH Internet search included OSTI OpenNet searches, the 

Nuclear Regulatory Commission (NRC) Agency-wide Documents Access and Management 

(ADAMS) web searches, and the DOE-National Nuclear Security Administration-Nevada Site Officesearch. Attachment One includes a summary of the Y-12 Plant documents. The summary specifically 

includes data capture details and general descriptions of the documents retrieved. 

In addition to the database and Internet searches listed above, NIOSH identified and reviewed 

numerous data sources for information relevant to determining the feasibility of dose reconstruction 

for the class of employees under evaluation. This included determining the availability of information 

on personal monitoring, area monitoring, industrial processes, and radiation source materials. The 

following subsections summarize the data sources identified and reviewed by NIOSH. 

4.3 Facility Employees and Experts

NIOSH reviewed a total of twenty-three documented communications (interviews) for this 

Addendum. Six of the interviews had been previously reviewed for the 2018 evaluation of petition 

SEC-00251 (one conducted in 2012 for SEC-00046; five conducted in 2018 for SEC-00251). These 

six interviews were re-reviewed for this SEC-00250 ER Addendum effort. Seventeen additional 

interviews were performed during 2019–2020. Four of these were initiated by NIOSH to target 

specific SEC-00250 ER Addendum evaluation goals (described briefly below). The remaining thirteen 

interviews were initiated by the petitioner and petitioner’s representative inviting former workers to 

share their respective site knowledge and employment experiences.
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The four interviews initiated by NIOSH included former Y-12 and K-25 personnel. They focused on 

thorium chest counting process details to better understand the following three topics: 

1. The internal dosimetry program and lung counting system for thorium monitoring of Y-12 

workers at K-25 during the Y-12 lung counter shutdown in January 1992 through May 1992 and 

beyond. 

2. The internal dosimetry program and lung counting system for thorium monitoring of Y-12 

workers with the new HPGe Y-12 system starting in June 1992 and beyond. 

3. Potential radionuclide intakes for Y-12 workers as evidenced by workplace controls, monitoring 

policies and procedures, and bioassay data. 

Interviews reviewed or conducted in support of the SEC-00250 ER Addendum evaluation: 

• Documented Communication, 2012, Documented communication SEC-00046 with [Name 

redacted] on operation of the MIVRML counter for the monitoring of thorium intakes at Fernald. 

Telephone interview by ORAU Team and NIOSH; March 15, 2012; SRDB Ref ID: 110639 

[ORAUT 2012b]

• Documented Communication, 2018a, Documented communication SEC-00251 with [Name 

redacted] on thorium activities at Y-12. In-person interview by ORAU Team; August 15, 2018; 

SRDB Ref ID: 173936 [ORAUT 2018b]

• Documented Communication, 2018b, Documented communication SEC-00251 with [Name 

redacted] on thorium activities at Y-12. In-person interview by ORAU Team; August 16, 2018; 

SRDB Ref ID: 173937 [ORAUT 2018c]

• Documented Communication, 2018c, Documented communication SEC-00251 with [Name 

redacted] on thorium activities at Y-12. In-person interview by ORAU Team; August 16, 2018; 

SRDB Ref ID: 173938 [ORAUT 2018d]

• Documented Communication, 2018d, Documented communication SEC-00251 with [Name 

redacted] on thorium activities at Y-12. In-person interview by ORAU Team; August 16, 2018; 

SRDB Ref ID: 173939 [ORAUT 2018e]

• Documented Communication, 2018e, Documented communication SEC-00251 with [Name 

redacted] on post-1957 thorium activities at Y-12. In-person interview by ORAU Team; August 

16, 2018; SRDB Ref ID: 174343 [ORAUT 2018f]

• Documented Communication, 2019a, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. In-person interview by ORAU Team; December 11, 

2019; SRDB Ref ID: 179794 [ORAUT 2019a]

• Documented Communication, 2019b, Documented communication SEC-00250 with [Name 

redacted] Y-12 / K-25 thorium activities. In-person interview by ORAU Team; December 23, 

2019; SRDB Ref ID: 179795 [ORAUT 2019b]
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• Documented Communication, 2019c, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. In-person interview by ORAU Team; December 23, 

2019; SRDB Ref ID: 179739 [ORAUT 2019c]

• Documented Communication, 2020a, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. In-person interview by ORAU Team; January 9, 

2020; SRDB Ref ID: 180370 [ORAUT 2020a]

• Documented Communication, 2020b, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

August 20, 2020; SRDB Ref ID: 184817 [ORAUT 2020b]

• Documented Communication, 2020c, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by ORAU Team; September 1, 

2020; SRDB Ref ID: 184705 [ORAUT 2020c] 

• Documented Communication, 2020d, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

October 30, 2020; SRDB Ref ID: 184816 [ORAUT 2020d] 

• Documented Communication, 2020e, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

October 30, 2020; SRDB Ref ID: 184703 [ORAUT 2020e] 

• Documented Communication, 2020f, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by ORAU Team; October 30, 

2020; SRDB Ref ID: 184704 [ORAUT 2020f] 

• Documented Communication, 2020g, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

October 21, 2020; SRDB Ref ID: 184708 [ORAUT 2020g] 

• Documented Communication, 2020h, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

October 22, 2020; SRDB Ref ID: 184701 [ORAUT 2020h] 

• Documented Communication, 2020i, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

November 4, 2020; SRDB Ref ID: 184700 [ORAUT 2020i] 

• Documented Communication, 2020j, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

November 4, 2020; SRDB Ref ID: 184706 [ORAUT 2020j] 

• Documented Communication, 2020k, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

November 4, 2020; SRDB Ref ID: 184707 [ORAUT 2020k] 
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• Documented Communication, 2020l, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by NIOSH and ORAU Team; 

November 6, 2020; SRDB Ref ID: 184818 [ORAUT 2020l] 

• Documented Communication, 2020m, Documented communication SEC-00250 with [Name 

redacted] on Y-12 / K-25 thorium activities. Telephone interview by ORAU Team; November 11, 

2020; SRDB Ref ID: 184702 [ORAUT 2020m] 

4.4 Previous Dose Reconstructions

NIOSH reviewed its NIOSH DCAS Claims Tracking System (referred to as NOCTS) to locate

EEOICPA-related dose reconstructions that might provide information relevant to the time period 

under evaluation (January 1, 1987 through December 31, 1994). Table 4-1 summarizes the results of 

this review (NOCTS data available as of January 21, 2021). 

Table 4-1: No. of Y-12 Plant Claims Submitted Under the Dose Reconstruction Rule

Description Totals

Total number of claims submitted for dose reconstruction 6869

Total number of claims submitted for energy employees who worked during the period under evaluation 

(January 1, 1987 through December 31, 1994). 2763

Total number of claims submitted for energy employees who started their employment during the period 

under evaluation (January 1, 1987 through December 31, 1994) 806

Number of dose reconstructions completed for energy employees who worked during the period under 

evaluation (i.e., the number of such claims completed by NIOSH and submitted to the Department of Labor 

for final approval).

2616

Number of claims for which internal dosimetry records were obtained for the identified years in the 

evaluated class definition 1341

Number of claims for which external dosimetry records were obtained for the identified years in the 

evaluated class definition 2363

There are 2,763 Y-12 claims with some employment between 1987 through 1994. NIOSH reviewed 

each claim to determine whether internal and external personal monitoring records could be obtained 

for the employee. As indicated in Table 4-1, for employees who worked during the class period under 

evaluation, NIOSH has obtained internal and external monitoring data for approximately 49% and 

86% of the claims, respectively. 
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4.5 Additional Data Capture

Since the last Y-12 Data Capture Synopsis in June 2019, additional data capture activities have added 

506 documents to the SRDB. The activities included Internet searches for arc-melting reports, formal 

data capture requests made to Y-12 staff, and a trip to the DOE operations center in Germantown, 

Maryland to acquire Y-12 thorium inventory and process information. The formal data capture 

requests were for details on the “Protected Area” portal monitor functional checks, chest-wallthickness data, as well as requests to resolve discrepancies in Y-12’s external dosimetry and bioassay 

datasets. All formal data request issues were successfully completed.

4.6 Delta View Imaging System

Y-12 staff maintains the Delta View Imaging System, an electronic database that contains scanned 

images of hard-copy reports and monitoring data associated with Y-12 personnel. Examples of data 

in Delta View include in-vivo lung counts, input forms, multi-channel analyzer output, gamma 

spectrometry images, and data from Y-12 and X-10 analytical labs. Delta View stores images of 

documents and is searchable. The images in Delta View are accessible by individual name or ID 

numbers, analysis, and sample type, among other parameters. Y-12 provided to NIOSH an excerpt 

from this system in the form of a spreadsheet index and individual image files associated with each 

spreadsheet row. There were approximately 24,000 images provided, containing in-vivo data from

1989 through 1995 [Martin Marietta 1989–1995].

4.7 Y-12 Electronic Records System

Maintained by the Y-12 Internal Dosimetry department, the Electronic Records System (ERS) data 

contain analytical results by individual, ID, bioassay type, date, and radionuclide. Y-12 initially 

provided NIOSH with an excerpt from this system in spreadsheet format containing 62,932

individual lung count records from 1958–1986 (also included were two records from 1989 and one

from 1990) [Martin Marietta 1984–1995]. These data were later augmented with an additional 

13,829 measurements from 1987–1991 [Martin Marietta 1987–1991], 1,275 measurements from 

1992–1993 [Martin Marietta 1992–1993], and 3,139 measurements from 1994–1999 [Lockheed 

Martin 1994–1999]. Y-12 provided an additional file in August 2020 containing 735 lung counts 

performed on contract employees between 1975 and 1991 [Martin Marietta 1958–1991].

5.0 Radiological Operations Relevant to the Class Evaluated by 

NIOSH

The following subsections summarize radiological operations at the Y-12 Plant from January 1, 1977 to 

December 31, 1994 and the information available to NIOSH to characterize particular processes and 

radioactive source materials.

5.1 Y-12 Plant and Process Description

Descriptions of radiological operations and source terms relevant to this Addendum can be found in 

Section 5.1 of the original SEC-00250 Y-12 ER [NIOSH 2019]. The 2019 ER provides considerable 

scope and detail of the Y-12 Plant’s potential exposure areas, processes, and source terms.
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5.2 Radiological Exposure Sources from the Y-12 Plant Operations

Radiological exposure source information relevant to the entire SEC-00250 evaluated class can be 

found in Section 5.2 of the SEC-00250 Y-12 ER [NIOSH 2019]. No additional information related to 

specific thorium activities during the January 1987 – December 1994 period has been captured since 

the SEC-00250 ER was issued. None of the interviewees (see Section 4.3) could recall with certainty 

any specific thorium activities occurring at the Y-12 Plant throughout the 1987–1994 period. 

However, NIOSH was able to retrieve inventory data specific to thorium for this period, as shown in 

Table 5-3 below.

Table 5-3: Y-12 Thorium Inventory (1986–1995)

Year Th Inventory (kg)

1986 5437

1987 4101

1988 4171

1989 4185

1990 4180

1991 4166

1992 4888

1993 4885

1994 5499

1995 18066

Source: [Livengood 2019]

A NIOSH review of thorium inventory records obtained from the DOE Nuclear Materials 

Management and Safeguards System (NMMSS) for the period 1986 through 1994 revealed that: (1)

there were relatively consistent thorium inventories between 1986 and 1994; and (2) the source of a 

thorium inventory increase in 1995 was related to the receipt of material categorized as “weapons 

awaiting disassembly feed” [Chaffman 2019]. Additional research into operations with thorium and 

information from the interviews indicated that there were no thorium activities other than arc melting 

during the period of evaluation at Y-12 [ORAUT 2018c,d,e]. It was concluded that the increase in 

thorium inventory is because of an increase of stored material that is unlikely to be a source of internal 

exposure. 

6.0 Summary of Available Monitoring Data for the Class Evaluated 

by NIOSH

The following subsections provide an overview of the available internal monitoring data for the 

thorium dose estimation feasibility assessment presented in this Addendum. 

6.1 Available Y-12 Plant Internal Monitoring Data

The subsections below address the availability of data related to thorium. Details regarding the various 

analyses used and the associated minimum detectable activities are presented in ORAUT-TKBS0014-5, Technical Basis Document for the Y-12 Plant-Occupational Internal Dose [ORAUT 2012a].
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6.1.2 Available Thorium Data

NOTE: In the SEC-00250 ER, NIOSH concluded that it had sufficient thorium data to estimate 

radiation dose for the period from August 1, 1979 through December 31, 1986 [NIOSH 

2019]. However, at that time, NIOSH was continuing to work with the Y-12 site to receive 

post-1986 activity-based thorium progeny data (i.e., data including results for Ac-228 and 

Pb-212). These data could allow NIOSH to estimate the maximum internal potential 

exposure from thorium for the period from January 1, 1987 through December 31, 1994. 

Therefore, NIOSH reserved its evaluation of internal exposure from thorium for the period 

1987–1994. This Addendum reflects the subsequent availability of these activity-based 

thorium progeny data. 

Background 

Lung counting data for uranium are available to NIOSH for the entire period under evaluation 

(January 1, 1977 through December 31, 1994). There are 772 thorium lung counts available from 

1977 through 1982. These data were received directly from Y-12 in spreadsheet form [BWXT 

2005]. All of these data are reported as total thorium in units of mass (mg). In the prior Y-12 

evaluation, NIOSH determined that these mass-based data could not be used to reconstruct internal 

dose from thorium. No additional mass-based data have been identified for the 1987–1994 period. 

In the prior evaluation, NIOSH used the ‘analysis type’ field associated with each measurement record 

in the lung count spreadsheet to identify Pb-212 and Ac-228 results within thorium-related lung 

counts (e.g., analysis types 3, 6, and 7) [Martin Marietta 1984–1995]. Table 6-3A below (Table 7-1 

from the SEC-00250 ER) summarizes the total number of thorium-related measurements of Ac-228 

and Pb-212 by year. One thousand-seven (1007) data points for thorium counts containing Pb-212 and 

Ac-228 data are available for the time period from August 1979 through December 1986.

Table 6-3A: Thorium Records 1979-1986

Year No. of Individuals** No. of Ac/Pb Measurements 

Used in Analysis

1979* 43 55

1980 110 128

1981 142 208

1982 83 179

1983 130 166

1984 87 89

1985 83 84

1986 95 98

Total 512 1007

Source: SEC-00250 Y-12 ER, Table 7-1 [NIOSH 2019].

* Data start in August 1979

** NOTE: The values in Column 2 represent the number of unique individuals 

monitored during each specific year. The Total value in the last record in 

Column 2 does not represent the sum of the values in that column. It 

represents the actual number of unique individuals monitored from 1979–

1986.
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In the interim, NIOSH obtained an update to the Y-12 lung count data excerpt file [Martin Marietta 

1984–1995], which includes results from 1987–1991 [Martin Marietta 1987–1991]. In addition, 

NIOSH identified additional lung count measurements within the Delta View system that were 

inadvertently excluded from the Y-12 Dosimetry Records System. A total of 52 measurements were 

identified for the period 1987 through 1991 [Martin Marietta 1989–1991]. 

The additional thorium-related data that have become available since the SEC-00250 Y-12 ER was 

issued are discussed below.

Available Activity-based Thorium Progeny Data 

Thorium-related lung count data during the period under evaluation in this Addendum (January 1, 

1987 through December 31, 1994) are now available from three measurement systems: 

1. The Y-12 in-vivo counting facility using a sodium iodine (NaI)-based detector system operating 

from January 2, 1987 through December 10, 1991; 

2. A low-energy germanium (LEGe)-based detector system operating at K-25 for Y-12 from 

January 13, 1992 through January 6, 1994; 

3. A LEGe-based detector system operating at Y-12 from May 14, 1992 through December 29, 

1994. 

Records for measurements performed using these three systems are available from both the Delta 

View Imaging System extract file described in Section 4.6 [Martin Marietta 1989–1995] and 

extracts from the Y-12 Electronic Record Keeping System described in Section 4.7 [Martin 

Marietta 1958–1991, 1987–1991, 1992–1993; Lockheed Martin 1994–1999]. The number of 

available thorium-related lung count data provided by these data sources are detailed below.

• Y-12 In-Vivo Facility: A total of 14,486 measurements were performed between January 2, 

1987 and December 10, 1991. Of these, a total of 3,459 measurements were analyzed for 

thorium (indicated as type 7, thorium) and each contain an Ac-228 and Pb-212 result in units of 

nCi. These results are contained in the excerpt file from the Y-12 electronic records system 

(described in Section 4.7). Table 6-3B shows the yearly and monthly distribution of these data.

Table 6-3B: Yearly and Monthly Distribution of Y-12 In-Vivo Facility Lung Count Data for Thorium

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

1987 14 23 25 36 28 26 18 3 1 7 20 39 240

1988 38 40 38 40 29 25 40 71 47 62 59 58 547

1989 48 43 31 35 71 77 42 77 52 70 66 53 665

1990 52 115 81 57 90 67 46 71 57 65 57 67 825

1991 113 89 88 79 71 88 82 187 148 139 58 40 1182

Source: [Martin Marietta 1987–1991]
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NIOSH can use the ‘analysis type’ provided in the lung count spreadsheet [Martin Marietta 1984–

1995] to identify Pb-212 and Ac-228 results within thorium-related lung counts (e.g., analysis 

types 3, 6, and 7) [Martin Marietta 1958–1991, 1987–1991]. Table 6-3C summarizes the total 

number of thorium-related measurements of Ac-228 and Pb-212 by year. Based on this dataset, 

there are 3,459 thorium counts containing Pb-212 and Ac-228 data for the time period from

January 1, 1987 through December 31, 1991. 

Table 6-3C: Thorium Records 1987–1991

Year No. of Unique Individuals* No. of Ac/Pb Measurements 

Used in Analysis

1987 220 240

1988 500 547

1989 599 665

1990 712 825

1991 1059 1182

Total 1799 3459

Source: [Martin Marietta 1958–1991, 1987–1991]

* NOTE: The values in Column 2 represent the number of unique individuals 

monitored during specified years. In addition, some individuals were monitored 

in multiple years. Thus, the value in the last record in Column 2 (i.e., 1,799) 

does not represent the sum of the values in that column; it represents the actual 

number of unique individuals monitored from 1987–1991. The Total value in 

the last record in Column 3 (i.e., 3,459) does represent the sum of the number of 

yearly measurements presented in that column.

• K-25 LEGe-based Detector: A total of 198 measurements were performed between January 13, 

1992 and January 6, 1994. These results are contained in the Y-12 Delta View System image 

collection (described in Section 4.6). The majority of these measurements (147 of 198) were 

performed between January 13, 1992 and May 19, 1992 and contained Th-232 results in units 

of nCi. All of the 147 results were annotated with a preceding “<” flag along with the 

annotation “MDA activity reported.” Some of the measurements performed after May 1992 (20 

of 51) used a different reporting format that did not include any information specific to Th-232. 

Table 6-3D shows the yearly and monthly distribution of these data. For months that are not 

reported, no data were available. 

Table 6-3D: Yearly and Monthly Distribution of K-25 LEGe-based Thorium Lung Count Data

Year Jan Feb Mar Apr May Nov Dec Total

1992 19 64 21 15 28 10 17 174

1993 1 NA 2 1 NA NA 3 4

Source: [Martin Marietta 1989–1995]

NA = Not Available
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• Y-12 LEGe-based Detector: NIOSH obtained an excerpt from the Y-12 ERS containing lung 

count measurements for 1992 through 1994 [Martin Marietta 1992–1993, Lockheed Martin 

1994–1999]. This dataset (ERS) did not classify counts by analysis type (as was done earlier); 

however, all measurements reported results for Ac-228. NIOSH identified additional lung count 

measurements within the Delta View system that were inadvertently excluded from the Y-12 

Dosimetry Records System. A total of 76 measurements were identified in the Delta View 

System for the period 1992–1994 [Martin Marietta 1992–1995]. Table 6-3E summarizes the 

available Ac-228 measurements between 1992 and 1994. A total of 2,196 measurements were 

performed between May 14, 1992 and December 29, 1994. Each of these measurements 

contains Ac-228 results in units of nCi. These results are contained in the excerpt file from the 

Y-12 electronic records system (as described in Section 4.7). Table 6-3E shows the yearly and 

monthly distribution of these data. Table 6-3F shows the number of individuals monitored and 

the number of Ac-228 results within this dataset. 

Table 6-3E: Yearly and Monthly Distribution of Y-12 LEGe-based Thorium Lung Count Data

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

1992 NA NA NA NA 8 35 94 87 100 109 14 13 460

1993 90 68 77 93 109 86 82 95 72 55 36 23 886

1994 40 84 93 47 97 84 64 69 130 63 46 33 850

Source: [Martin Marietta 1992–1993; Lockheed Martin 1994–1999].

NA = Not Available 

Table 6-3F: Thorium Records 1992-1994

Year No. of Individuals No. of Ac-228 Measurements

1992 a 452 b 460 b

1993 770 b 886 b

1994 719 c 850 c

Total 1616 e 2196

a Data start in May 1992.

b Source: [Martin Marietta 1992-1993]

c Source: [Lockheed Martin 1994-1999]

d Source: [Martin Marietta 1989–1995]

e NOTE: The values in Column 2 represent the number of unique individuals 

monitored during the specified years. In addition, some individuals were monitored 

in multiple years. Thus, the value in the last record in Column 2 (i.e., 1616) does not 

represent the sum of the values in that column; it represents the actual number of 

unique individuals monitored from 1992–1994. The Total values in the last record in 

Column 3 (i.e., 2196) and Column 4 (i.e., 2193) do represent the sum of the number 

of yearly measurements presented in those columns.
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7.1 Pedigree of Y-12 Plant Data

This subsection answers questions that are necessary to perform a feasibility evaluation. Data Pedigree 

addresses the background, history, and origin of the data, such as:

• Have any site methodologies changed over time?

• Do the primary data source and secondary data source match?

• Are the data internally consistent?

All these factors form the basis of the researcher’s confidence and later conclusions about the data’s 

quality, credibility, reliability, representativeness, and sufficiency for determining the feasibility of 

dose reconstruction. The feasibility evaluation presupposes that data pedigree issues have been settled.

7.1.1 Internal Monitoring Data Pedigree Review

In determining the pedigree of the Y-12 Plant monitoring data and the sufficiency of available thorium 

data to bound worker doses, NIOSH evaluated the following:

• The overall suitability of the Y-12 Plant’s internal monitoring program

• Internal thorium exposure sources and exposure potential of the workforce

• Internal exposure monitoring data availability and quality

• Internal reviews and assessments of Y-12 monitoring data

Y-12’s radiation monitoring program has been well-documented and relevant documents have been 

captured and reviewed for appropriateness. NIOSH has found no evidence of significant deficiencies 

in monitoring program documentation, execution, or reporting that would prevent proper assessment 

of occupational thorium doses for the period under evaluation.

Although approaches to worker selection and sampling frequency have been modified over time, 

Y-12’s internal monitoring program participation, since its inception, has been based on worker 

exposure potential. Monitoring results have historically been compared to Plant Action Values (PAV) 

that have been based on contemporary ICRP guidelines. Work adjustments and assignments have 

been made when results exceeded ten percent of PAVs. Over time, actual monitoring results have 

increasingly been used to guide program modification.

By the 1960s, routine urinalysis and in-vivo monitoring programs were maintained for all personnel 

assigned to work regularly with uranium, thorium, plutonium, and tritium [Union Carbide 1965, PDF

p. 20]. Since that time, in-vivo radioactivity measurement has been used to determine lung activity 

(both uranium and thorium were reported). In these earlier years, workers considered to have exposure 

potential were scheduled for quarterly and spot urinalysis sampling, and in-vivo counts at 

approximately six-month intervals [Union Carbide 1963, PDF pp. 23, 40].

Based on measured worker-exposure experience and revised ICRP recommendations regarding 

excretion-rate indications of lung burdens, the selection and method of worker monitoring was 

modified in the early 1970s [Union Carbide 1972, PDF pp. 2–3]. This modification incorporated an 

increasing reliance on body-counting and a reduction in urinalyses.
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As documented in Y-12’s 1992 Technical Basis for the Internal Dosimetry Program, individuals are 

selected for participation in the bioassay program if they work in an area where routine air monitoring 

is performed. The frequency of participation depends on the air-monitoring results in their work area. 

The minimum lung count frequency described for areas where routine air monitoring is performed is 

once a year [Martin Marietta 1992, PDF p. 32–33].

As mentioned in Sections 4.6 and 4.7, and detailed in Section 6, Y-12 stored monitoring data in two 

repositories within the period currently under evaluation (1987–1994). These two repositories are: (1)

the Delta View Imaging System, comprised of scanned images of hard-copy reports and monitoring 

data printouts associated with Y-12 personnel dosimetry data and in-vivo results; and (2) the site’s 

electronic record system (ERS) containing analytical results by individual, ID, bioassay type, date, 

and radionuclide.

NIOSH compared the Delta View Imaging System dataset with the contents of the first two datasets

made available from the ERS. Although most workers’ results could be identified in both datasets, 

it became apparent that some discrepancies existed. Some workers’ data was found in the Delta 

View system but not in the ERS (669 records for the 1989–1991 period and 169 records for the 

1992–1994 period). In addition, NIOSH noted that worker records, regardless of year, were 

predominantly from the 7000- and 9000-series departments that contained subcontracted 

construction workers. 

In May 2020, NIOSH sent a data capture request to Y-12 (ORO-FY20-008) to clarify the apparent 

data-repository discrepancies and assess this potential data-pedigree issue [ORAUT 2020n]. Y-12 

records personnel responded on August 20, 2020 with a data file intended to augment the existing 

1958–1991 electronic data system lung count dataset [Martin Marietta 1958–1991]. The file

contains an additional 735 measurements for contract personnel that were previously excluded.

Y-12 also provided a more-detailed accounting of other previously-identified missing records (i.e., 

those located in the Delta View system but not in the Y-12 dosimetry record system) that remained 

absent from the 735 additional records [Martin Marietta 1989–1991; 1992–1995].

For the 669 records NIOSH identified for the 1989–1991 time period:

• 568 were provided in the update file.

• 6 were determined to be invalid measurements by Y-12.

• 43 were measurements for non-employees at the Y-12 site (i.e., measurements performed for other 

facilities).

• 52 were valid measurements but were inadvertently excluded from the electronic dosimetry record 

system due to a migration error. Y-12 indicated that the Delta View version of these records serves 

as the copy of record.

For the 169 records identified for the 1992–1994 time period:

• 89 were determined to be invalid measurements by Y-12.

• 4 were determined to be actually present in the Y-12 dosimetry record-keeping system under a 

different SSN (i.e., the SSN on the paper record was incorrect).

• 76 were valid measurements but were inadvertently excluded from the electronic dosimetry record 

system due to a migration error. Y-12 again indicated that the Delta View version of these records 

serves as the copy of record.
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Though Y-12’s “dose of record” for the period under evaluation occasionally resides in only one of 

two possible repository formats (i.e., the ERS and Delta View records systems), Y-12 has supplied

NIOSH with both sources of the monitoring data applicable to the period under evaluation for this 

Addendum. Coupled with the results of NIOSH’s evaluation of the Y-12 monitoring program, 

NIOSH concludes that the available monitoring data are sufficient in terms of quality, 

completeness, and representativeness for evaluating thorium intakes for the entire period under 

evaluation (1987–1994).

NIOSH’s data pedigree evaluation concludes that data are of sufficient quality to use in bounding 

internal thorium doses from January 1, 1987 through December 31, 1994. Additional details regarding 

specific data availability and methods used to bound internal thorium doses are discussed below in 

subsection 7.2.

7.2 Evaluation of Bounding Internal Radiation Doses at Y-12 Plant 

The principal source of internal radiation doses for members of the class under evaluation was 

airborne thorium particulate material. The following subsections address the ability to bound 

internal doses, methods for bounding doses, and the feasibility of internal dose reconstruction.

7.2.3 Methods for Bounding Internal Dose at the Y-12 Plant

The following subsections summarize the methods for bounding internal thorium dose at Y-12 during 

the period under evaluation in this Addendum (January 1, 1987 through December 31, 1994).

7.2.3.2 Methods for Analyzing Thorium Bioassay Data

Lung count results that include Ac-228 and Pb-212 data are now available for the period January 1, 

1987 through December 31, 1991. These data can be used in the same manner described in the 

SEC-00250 Y-12 ER (and below) to bound thorium-related doses. 

For the period June 1, 1992 through December 31, 1994, NIOSH only has access to Ac-228 lung

count results. However, NIOSH developed a study of the Y-12 lung counting system (DCAS-RPRT008) that establishes a relationship between the chest-wall thickness (CWT) for an individual being 

monitored by the lung counting system and the minimum detectable Pb-212 activity associated with 

that count [NIOSH 2020]. The CWT value is entered into the equation derived in DCAS-RPRT-008 

(shown in Figure 7-1 below) to arrive at the minimum detectable Pb-212 activity. This Pb-212 

activity, along with the already-available Ac-228 result, are then used in the same manner as the prior 

data (i.e., from 1987–1991) to bound the thorium dose.

For 1992 and 1993, NIOSH retrieved from the Delta View image collection the CWT values from the 

output files associated with the majority of these counting records (2193 out of 2196) [Martin Marietta 

1989–1995]. The CWT value is provided for each measurement in the Y-12 Electronic Record 

Keeping System starting in 1994 [Lockheed Martin 1994-1999]. Table 7-1A below summarizes the 

available Ac-228 and CWT data between 1992 and 1994. Figure 7-1 farther below (Figure 10 in 

DCAS-RPT-008) shows the relationship between CWT and Pb-212 activity [NIOSH 2020, PDF p. 

18]. The relationship shown in Figure 7-1 can be used to determine the Pb-212 activity based on CWT 

data when Pb-212 data are not available.
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Table 7-1A: Thorium Records 1992-1994

Year No. of Individuals No. of Ac-228 Measurements No. of CWT Measurements

1992 a 452 b 460 b 459 d

1993 770 b 886 b 884 d

1994 719 c 850 c 850 c

Total 1616 e 2196 2193

a Data start in May 1992.

b Source: [Martin Marietta 1992-1993]

c Source: [Lockheed Martin 1994-1999]

d Source: [Martin Marietta 1989–1995]

e NOTE: The values in Column 2 represent the number of unique individuals monitored during 

the specified years. In addition, some individuals were monitored in multiple years. Thus, the 

value in the last record in Column 2 (i.e., 1,616) does not represent the sum of the values in that 

column; it represents the actual number of unique individuals monitored from 1992–1994. The 

Total values in the last record in Column 3 (i.e., 2,196) and Column 4 (i.e., 2,193) do represent 

the sum of the number of yearly measurements presented in those columns.

The resulting Ac-228 and Pb-212 data are employed as specified in ORAUT-OTIB-0076, Guiding 

Reconstruction of Intakes of Thorium Resulting from Nuclear Weapons Programs [ORAUT 2014]. In 

summary, thorium intakes are evaluated using chest counts and DCAL (Dose and Risk Calculation) 

software computational methods to account for disequilibrium and independent kinetics. Additional 

assumptions include: 

• Pb-212 and/or Ac-228 activities can be established. 

• A two-separation thorium production process operated at Y-12 [ORAUT 2018e]; however, 

because the thorium may have been separated once before Y-12 received it, three separations will 

be assumed (this is a claimant-favorable approach). 

Although Th-232 results were reported for lung counts performed during the period January 1992 

through May 1992, NIOSH lacks sufficient information to interpret these results in a manner that 

would allow the determination of associated Th-228 and Ra-228 activities. Based on the inventory 

analysis presented in Section 5.2 of this Addendum, NIOSH concludes that data from June 1992 

through December 1994 can be used to bound exposures during January 1992 through May 1992 

because inventory quantities were consistent throughout the 1992–1994 time period. 
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Figure 7-1: MDA for Pb-212 as a Function of Chest Wall Thickness (CWT)

Source: NIOSH 2020, PDF p. 18

7.2.4 Internal Dose Reconstruction Feasibility Conclusion 

NIOSH has determined that there are sufficient activity-based Pb-212 and Ac-228 in-vivo monitoring 

data to allow NIOSH to determine the associated intakes of thorium-232, thorium-228, and 

radium-228 with sufficient accuracy for the period from January 1, 1987 through December 31, 1994. 

7.4 Evaluation of Petition Basis for SEC-00250

The following subsections evaluate the assertions made by the petitioner on behalf of petition SEC00250 for the Y-12 Plant that were reserved for consideration in this Addendum (i.e., not resolved in 

the SEC-00250 ER published on July 17, 2019). 

7.4.1 Uranium and Thorium Contamination Existed in the Machine Shop

Issue: The petitioner submitted Additional Supporting Document re contaminated machines [9201-01 

Machines Contaminated, no date]. 

Response: The cited document consists of a two-paragraph narrative of unknown origin indicating that 

depleted uranium and thorium contamination was found on equipment in 9201-01 in 2012. The values 

quoted indicated that the contamination was “fixed” (i.e., removable contamination was not present). 

NIOSH was able to locate a radiological survey conducted on May 17, 2012 that identifies fixed 

contamination levels on a saw in 9201-1 with levels matching the value cited by the petitioner (i.e., 

240,000 dpm/100 cm2

 fixed, no removable contamination) [BWXT 2012]. The identity of the activity 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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source (i.e., whether it was thorium, uranium, or some mixture of the two) was not provided on the 

survey. 

NIOSH reviewed the available DOE Occurrence (ORPS) reports master list [DOE 2019a] and the 

DOE Noncompliance Tracking System (NTS) reports master list [DOE 2019b]. NIOSH was unable to 

locate any additional information from these two sources. 

No specific detail on either the nature of the contamination or its accessibility to individual workers 

was located, nor was such information provided by the petitioner. Although NIOSH was unable to 

verify that the identified contamination was related to thorium activities, since the survey indicated 

that the activity was fixed (i.e., no removable component) NIOSH concludes that the petitionerprovided information is not inconsistent with the conclusion that dose reconstruction for thorium is 

feasible for the period under evaluation in this Addendum (January 1, 1987 through December 31, 

1994). 

7.5 Summary of Feasibility Findings for Petition SEC-00250

This report provides feasibility conclusions for completing dose reconstructions for employees at the 

Y-12 Plant from January 1, 1987 through December 31, 1994. NIOSH found that the available 

monitoring records, process descriptions, and source term data available are sufficient to complete 

thorium internal dose reconstructions for the proposed class of employees from January 1, 1987 

through December 31, 1994. 

Table 7-2 summarizes the complete results of the feasibility findings for SEC-00250, including the 

thorium finding documented in this Addendum. 

Table 7-2: Summary of Feasibility Findings for SEC-00250

Source of Exposure

January 1, 1977 through 

July 31, 1979

Reconstruction Feasible 

(Yes or No)

August 1, 1979 through 

December 31, 1986

Reconstruction Feasible 

(Yes or No)

January 1, 1987 through 

December 31, 1994

Reconstruction Feasible 

(Yes or No)

Internal (U) Yes Yes Yes

Internal (Th) No Yes Yes1 

Internal (calutron-cyclotronrelated radioisotopes) Yes Yes2 NA2

External (Gamma, Beta, Neutron) Yes Yes2 Yes

Occupational Medical X-ray Yes Yes Yes

1 Previously “Reserved” in the SEC-00250 Evaluation Report, the evaluation documented in this Addendum concludes that 

reconstruction of internal thorium dose is feasible for January 1, 1987 through December 31, 1994.

2 Isotopes Group calutron and cyclotron operations managed by ORNL X-10 but located on the Y-12 campus ended on 

December 31, 1983.

As of January 21, 2021, 2,763 claims have been submitted to NIOSH for individuals who worked at 

Y-12 Plant during the period under evaluation in this Addendum. Dose reconstructions have been 

completed for 2,616 individuals (~95%).
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8.0 Evaluation of Health Endangerment for the Petition SEC-00250

Addendum

The health endangerment determination for the class of employees covered by this evaluation report is 

governed by both EEOICPA and 42 C.F.R. § 83.13(c)(3). Under these requirements, if it is not 

feasible to estimate with sufficient accuracy radiation doses for members of the class, NIOSH must 

also determine that there is a reasonable likelihood that such radiation doses may have endangered the 

health of members of the class. Section 83.13 requires NIOSH to assume that any duration of 

unprotected exposure may have endangered the health of members of a class when it has been 

established that the class may have been exposed to radiation during a discrete incident likely to have 

involved levels of exposure similarly high to those occurring during nuclear criticality incidents. If the 

occurrence of such an exceptionally high-level exposure has not been established, then NIOSH is 

required to specify that health was endangered for those employees who were employed for a number 

of work days aggregating at least 250 work days within the parameters established for the class or in 

combination with work days within the parameters established for one or more other classes of 

employees in the SEC. 

The evaluation presented in this Addendum is specific to internal dose reconstruction feasibility at the 

Y-12 Plant for the period from January 1, 1987 through December 31, 1994. NIOSH concludes that it 

has access to sufficient information to estimate the maximum radiation dose for every type of cancer 

for which radiation doses are reconstructed, and that could have been incurred in plausible 

circumstances by any member of the class for the period from January 1, 1987 through December 31,

1994.

NIOSH’s evaluation determined that it is feasible to estimate radiation dose for members of the 

NIOSH-evaluated class with sufficient accuracy based on the sum of information available from 

available resources. Therefore, a health endangerment determination is not required.

9.0 Class Conclusion for the Petition SEC-00250 Addendum

Based on its full research of the class under evaluation, NIOSH found no part of the said class for

which it cannot estimate radiation doses with sufficient accuracy. This class includes all on-site 

personnel who worked at the Y-12 Plant from January 1, 1987 through December 31, 1994.

NIOSH has carefully reviewed all material sent in by the petitioner, including the specific assertions 

stated in the petition, and has responded herein (see Section 7.4). NIOSH has also reviewed available

technical resources and many other references, including the SRDB, for information relevant to 

SEC-00250. In addition, NIOSH reviewed its NOCTS dose reconstruction database to identify 

EEOICPA-related dose reconstructions that might provide information relevant to the petition 

evaluation.

These actions are based on existing, approved NIOSH processes used in dose reconstruction for 

claims under EEOICPA. NIOSH’s guiding principle in conducting these dose reconstructions is to 

ensure that the assumptions used are fair, consistent, and well-grounded in the best available science. 

Simultaneously, uncertainties in the science and data must be handled to the advantage, rather than to 

the detriment, of the petitioners. When adequate personal dose monitoring information is not 

available, or is very limited, NIOSH may use the highest reasonably possible radiation dose, based on 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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reliable science, documented experience, and relevant data to determine the feasibility of 

reconstructing the dose of an SEC petition class. NIOSH contends that it has complied with these 

standards of performance in determining the feasibility or infeasibility of reconstructing radiation dose 

for the class under evaluation. 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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10.0 References 

42 CFR 83 [2018]. Procedures for designating classes of employees as members of the special 

exposure cohort under the Energy Employees Occupational Illness Compensation Program Act of 

2000. [SRDB Ref ID: 179160] 

9201-01 Machines Contaminated [no date]. 9201-01 machines contaminated with depleted uranium 

and thorium. Supporting document from Y-12 petitioner. No author, no date (content mentions 2012). 

[SRDB Ref ID: 176786] 

BWXT [2005]. Thorium lung count results by year spreadsheets. Y-12 Plant. Excel sheets containing 

Y-12 thorium lung count results for 1958–1982. Provided to NIOSH by Y-12 on May 13, 2005. Oak 

Ridge, TN: BWXT. SRDB Ref ID: 17073 

BWXT [2012]. Survey to support finding contaminated hoses and saw TF400. Oak Ridge, TN: 

BWXT. May. [SRDB Ref ID: 183188] 

Chaffman S [2019]. Thorium inventory and transactions, tables and graphs. Email to Cettin J with 

attachments with Y-12 data. Germantown, MD: U.S. Department of Energy, National Nuclear 

Security Administration. December 18. [SRDB Ref ID: 178888] 

DOE [2019a]. Y-12 ORPS report list. Washington, DC: U.S. Department of Energy. Accessed March 

11. [SRDB Ref ID: 183140] 

DOE [2019b]. Y-12 Noncompliance Tracking System list spreadsheet. Washington, DC: U.S. 

Department of Energy. Accessed September 14. [SRDB Ref ID: 183158] 

Livengood G [2019]. Historical review of accountable nuclear materials at the Y-12 Plant. Email to 

Connell W. Washington, DC: U.S. Department of Energy. December 17. [SRDB Ref ID: 180497] 

Lockheed Martin [1994–1999]. Y-12 lung counts 1994–1999. Data for various dates from 1994 

through 1999. Oak Ridge, TN: Lockheed Martin. [SRDB Ref ID: 177942] 

Martin Marietta [1958–1991]. Y-12 lung count spreadsheet. Data for various dates from 1958 through 

1991. Oak Ridge, TN: Martin Marietta. [SRDB Ref ID: 182925] 

Martin Marietta [1984–1995]. Y-12 lung count spreadsheet. Data for various dates from 1984 through 

1995. Oak Ridge, TN: Martin Marietta. [SRDB Ref ID: 176724] 

Martin Marietta [1987–1991]. Y-12 lung counts spreadsheet. Data for various dates from 1987 

through 1991. Oak Ridge, TN: Martin Marietta. [SRDB Ref ID:177978] 

Martin Marietta [1989–1991]. Delta View not in Y-12 extract - LMS comments 1989-1991. Oak 

Ridge, TN: Martin Marietta. [SRDB Ref ID: 182927] 

Martin Marietta [1989–1995]. [Delta View] 1989-1995 whole-body count data. Y-12 Plant Delta 

View data for various dates from 1989 through 1995. Oak Ridge, TN: Martin Marietta. [SRDB Ref 

ID: 176611] 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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Martin Marietta [1992]. Technical basis for the internal dosimetry program at the Y-12 Plant. Oak 

Ridge, TN: Martin Marietta. March 2. [SRDB Ref ID: 59682] 

Martin Marietta [1992–1993]. Y-12 lung counts 1992–1993. Data for various dates from 1992 through 

1993. Oak Ridge, TN: Martin Marietta. [SRDB Ref ID: 177941] 

Martin Marietta [1992–1995]. Delta View not in Y-12 extract – LMS comments 1992-1995 

spreadsheet. Oak Ridge, TN: Martin Marietta. [SRDB Ref ID: 182926] 

NIOSH [2019]. Special exposure cohort (SEC) petition SEC-00250 Y-12. Cincinnati, OH: U.S. 

Department of Health and Human Services, Centers for Disease Control and Prevention, National 

Institute for Occupational Safety and Health. July 17. [SRDB Ref ID: 180255] 

NIOSH [2020]. Evaluation of the Pb-212 detection limit for a lung count at the Y-12 facility from 

1992–1995. DCAS-RPT-008 Rev. 00. Cincinnati, OH: U.S. Department of Health and Human 

Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and 

Health, Division of Compensation Analysis and Support (DCAS). April 27. [SRDB Ref ID: 181252] 

ORAUT [2012a]. Y-12 National Security Complex – occupational internal dose. ORAUT-TKBS0014-5 Rev. 03. Oak Ridge, TN: Oak Ridge Associated Universities. March 12. [SRDB Ref ID: 

109202] 

ORAUT [2012b]. Documented communication SEC-00046 with [Name redacted] on operation of the 

MIVRML counter for the monitoring of thorium intakes at Fernald. Oak Ridge, TN: Oak Ridge 

Associated Universities Team. March 15. [SRDB Ref ID: 110639] 

ORAUT [2014]. Guiding reconstruction of intakes of thorium resulting from nuclear weapons 

programs. ORAUT-OTIB-0076 Rev. 00. Oak Ridge, TN: Oak Ridge Associated Universities. July 10. 

[SRDB Ref ID: 133669] 

ORAUT [2018a]. Monitoring feasibility evaluation for exotic radionuclides produced by the Oak 

Ridge National Laboratory Isotopes Division. ORAUT-RPRT-0090 Rev. 00. Oak Ridge, TN: Oak 

Ridge Associated Universities Team. March 29. SRDB Ref ID: 170258] 

ORAUT [2018b]. Documented communication SEC-00251 with [Name redacted] on thorium 

activities at Y-12. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 15. [SRDB Ref 

ID: 173936] 

ORAUT [2018c]. Documented communication SEC-00251 with [Name redacted] on thorium 

activities at Y-12. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 16. [SRDB Ref 

ID: 173937] 

ORAUT [2018d]. Documented communication SEC-00251 with [Name redacted] on thorium 

activities at Y-12. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 16. [SRDB Ref 

ID: 173938] 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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ORAUT [2018e]. Documented communication SEC-00251 with [Name redacted] on thorium 

activities at Y-12. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 16. [SRDB Ref 

ID: 173939] 

ORAUT [2018f]. Documented communication SEC-00251 with [Name redacted] on thorium 

activities at Y-12. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 16. [SRDB Ref 

ID: 174343] 

ORAUT [2019a]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. December 11. [SRDB 

Ref ID: 179794] 

ORAUT [2019b]. Documented communication SEC-00250 with [Name redacted] Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. December 23. [SRDB 

Ref ID: 179795] 

ORAUT [2019c]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. December 23. [SRDB 

Ref ID: 179739] 

ORAUT [2020a]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. January 9. [SRDB Ref 

ID: 180370] 

ORAUT [2020b]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. August 20. [SRDB Ref 

ID: 184817]

ORAUT [2020c]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. September 1. [SRDB 

Ref ID: 184705] 

ORAUT [2020d]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. October 30. [SRDB Ref 

ID: 184816] 

ORAUT [2020e]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. October 30. [SRDB Ref 

ID: 184703] 

ORAUT [2020f]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. October 30. [SRDB Ref 

ID: 184704] 

ORAUT [2020g]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. October 21. [SRDB Ref 

ID: 184708] 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

27 of 49 

ORAUT [2020h]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. October 22. [SRDB Ref 

ID: 184701] 

ORAUT [2020i]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. November 4. [SRDB 

Ref ID: 184700] 

ORAUT [2020j]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. November 4. [SRDB 

Ref ID: 184706] 

ORAUT [2020k]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. November 4. [SRDB 

Ref ID: 184707] 

ORAUT [2020l]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. November 6. [SRDB 

Ref ID: 184818] 

ORAUT [2020m]. Documented communication SEC-00250 with [Name redacted] on Y-12 / K-25 

thorium activities. Oak Ridge, TN: Oak Ridge Associated Universities Team. November 11. [SRDB 

Ref ID: 184702] 

ORAUT [2020n]. ORAUT data capture strategy ORO FY20-008 (Y-12). Oak Ridge, TN: Oak Ridge 

Associated Universities Team. May 28. [SRDB Ref ID: 183429] 

Union Carbide [1963]. Y-12 radiation safety manual. Y-1401. Y-12 Plant. Oak Ridge, TN: Union 

Carbide Corporation Nuclear Division. July 23. SRBD Ref ID: 174178. 

Union Carbide [1965]. Y-12 radiation safety manual. Y-1401. Y-12 Plant. Oak Ridge, TN: Union 

Carbide Corporation Nuclear Division. March 24. SRBD Ref ID: 8577. 

Union Carbide [1972]. Uranium urinalysis program. Y-12 Plant. Oak Ridge, TN: Union Carbide 

Corporation Nuclear Division. January 10. SRBD Ref ID: 59678. 
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

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Attachment One: Data Capture Synopsis 

Table A1-1: Summary of Holdings in the SRDB for the Y-12 Plant

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Primary Site/Company Name: Y-12 Plant

1942-present, DOE 

Alternate Site Names: Y-12 National Security Complex

Physical Size of the Site: 811 acres holding over 350 

buildings.

Site Population: In 1945, more than 22,000 workers at the 

site. During the Cold War 8,000 people worked around the 

clock. Noted 6,866 employees in June 1963 and 6,000 in 

2011. In October 2018, Y-12 reported more than 4,700 

federal and contractor employees work at the site.

Bioassay data, 86-inch cyclotron program and radiation protection, 

buildings and years where thorium was present, foundry health 

physics, handling and working with Np, in-vivo monitoring program 

and results, list of names and badge numbers, neutron field 

measurement, uranium air limits and their impact on Y-12, personnel 

notebooks, plant procedures, plutonium air problem, progress reports, 

radiation generating devices, radiation safety manual, radiological 

incidents, radiological surveys (airborne, contamination, etc.), record 

book of materials, run sheets from 86-inch cyclotron, separation of 

isotopes, neutron film results, sunflower foundry employees, thorium 

program lung count results, transuranic hazard assessment, uranium in 

effluent, urinalysis and fecal sample program related information, 

various technical basis documents, applying thorium surface 

contamination limits, internal dosimetry program, background 

subtraction and critical level for ET1 dosimeters, estimating the 

shallow dose equivalent, dosimetry quality control program 

information, building radiation and contamination periodic surveys, 

neutron-photon radiation surveys, container surveys for outgoing 

shipments, calibration and operation of the in-vivo lung counter, 

employee bioassay and film/TLD reports, plant health physics 

quarterly reports, thorium contamination survey results, thorium air 

sample results, air sampling system and locations, thorium processing, 

a process knowledge expert interview, data reduction software for invivo counting, dosimetry data with thorium in-vivo counts for a Y-12 

employee, a 1964 Y-12 radiation safety manual, a whole body count 

column header key, 1951-1999 lung count data, the old, da, and dah 

external dosimetry databases, protective force orders, dose rates of 

portal monitor check sources, history of accountable Y-12 sources, 

various revisions of the Y-12 external dosimetry TBD, Y-12 reviews 

and explanations of the external dosimetry databases, Y-12 

reconciliation of differences between the internal dosimetry database 

and DeltaView bioassay result cards, and a survey to support finding 

contaminated hoses and saw.

09/28/2020 968
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29 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

State Contacted: NA State was not contacted due to Y-12 being an active Department of 

Energy site.

NA NA

Albany Research Center A 1950 report on the chemical properties of californium and quarterly 

radiation reports.

03/21/2013 2

Ames Laboratory Ames histories, 1951-1953 radiation work permits, survey reports, and 

thorium shipments to other facilities.

01/25/2016 8

Argonne National Laboratory-East Organization of National Nucleonic Program, personnel procedure for 

transferring to Y-12 in 1943, monthly Operation Clean Sweep status 

reports, a 1951 chemical processing meeting program, 1953 

Radiological Physics Division reports, EBR-I construction plans, and 

plutonium scrap processing information.

01/29/2020 7

Battelle Laboratory-King Avenue Thorium reports, a 1951 material balance report, a radiation excursion 

in Building 9213, an AEC material transfer matrix, and a nuclear 

battery report.

01/09/2013 7

Brookhaven National Laboratory Ambient air monitoring parameters at DOE facilities and monthly 

reports.

10/22/2008 4

Cincinnati Public Library A Manhattan Project History. 08/06/2008 1

Claimant Provided Work products from inter-agency working groups and links between 

exposure to occupational hazards and illnesses in the DOE contractor 

workforce, an extrusion video, radon measurements, a site walking 

tour, a contamination survey and environmental report, a hearing 

before the workers' compensation board state of New York, Y-12 

contaminated scrap shipped to the East Tennessee Technology Park, 

and a Y-12 building directory.

01/04/2019 9

Colorado Mesa University Recovery of uranium from carnotite ores, progress reports of carnotite 

studies, separation of uranium from urine, stack sampling, radiation 

emergencies, and new methods for interpreting neutron data from 

various dosimeter types.

10/16/2012 10

DCAS SEC Viewer Occupational dose reports, Special Exposure Cohort petitions, a 

Special Exposure Cohort Petition Qualification report, radiological 

surveys, a Defense Nuclear Facilities Safety Board audit report, and a 

response to a Defense Nuclear Facilities Safety Board

recommendation. 

10/21/2019 13
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30 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Department of Labor / Paragon Background report and evaluation of resurvey requirements for the 

former Atomic Energy Commission portion of the Lake Ontario 

Ordinance Works (LOOW), request for scrap evaluation, shipment of 

Schenectady wastes to Oak Ridge, a complex-wide mixed waste 

report, a mercury waste management report, notice of a recommended 

claimant decision, and a visit from Cotter Corporation personnel.

03/15/2019 13

DOE Albuquerque Complex NNSA NURE activation analysis system correspondence. 01/13/2012 1

DOE Environmental Consolidated Business Center 

(EMCBC) - Denver

Rocky Flats thorium shipments to Y-12. 02/12/2014 1

DOE Environmental Measurements Laboratory Air sampling for the control of internal exposure from enriched 

uranium at Y-12, a beryllium study, criticality alarms and accident 

dosimetry, and in-vivo counting as a device for evaluating uranium 

exposure.

01/21/2011 4

DOE Germantown Beryllium history, waste disposal, monthly accountability reports, 

thorium information, site histories, Manhattan District History 

sections, records holding area search procedures, DOE reasonable 

search protocol spreadsheet, a 1965 plant missions matrix, 

accountability station codes, and a data tracking spreadsheet.

09/17/2015 23

DOE Legacy Management - Grand Junction Office Accomplishments of the National Lead Company of Ohio, Electro 

Metallurgical weekly production report, requests for material transfers, 

storage/disposal requests, electromagnetic separation of isotopes at 

Oak Ridge, results of mobile gamma scanning activities, results of soil 

sample analysis, return of thorium from Savannah River programs, 

return of thorium from Davison Chemical, LOOW production report 

describing materials shipped to Y-12, budget reviews, an accidental 

radiation excursion at Y-12, a contractor list, lithium metal purchase 

contracts, and history of Hanford.

08/30/2011 59
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Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

DOE Legacy Management - Morgantown Health and mortality studies of federal nuclear workers, uranium in 

urine samples, appraisal of occupational medical program, bioassay 

department highlights report, comparison of FMPC's uranium in urine 

sample results with Y-12's results, comprehensive epidemiologic data 

resource, DOE studies finding excess cancer mortality at several DOE 

nuclear facilities, disposal of thorium residues, Extrusion Plant (RMI) 

receipts and shipments, progress and production reports and orders, 

material balance report by facility, plutonium content of NLO feed 

materials, production order enriched uranium to Y-12, results of 

uranium urines, thorium shipments, thorium bioassay, recycled 

uranium data, trip reports, FUSRAP reports, environmental reports, 

uranium urine exchange program information, report of analysis, 

comparisons of various sites' bioassay programs, transmittal of a 

bioassay investigation, and TLD monitoring.

08/26/2019 171

DOE Legacy Management - MoundView (Fernald 

Holdings, includes Fernald Legal Database)

Air emissions annual report, annual report of the Health and Safety 

Division, Colonie site receipts of depleted uranium, DOE health and 

mortality study, environmental reports, Grand Junction processing of 

feed material scraps, incineration of radioactive solid wastes, major 

thorium campaigns and accountability documents, radioactive waste 

shipments, radiological incidents, shipping and receipt documents for 

enriched uranium and thorium, thorium bioassay investigations, 

thorium derby metal for Y-12, thorium nitrate specifications, trip 

reports, and Y-12 Plant thorium powder or pellet procurement 

specifications.

02/01/2012 86

DOE Legacy Management - MoundView (Fernald 

Holdings, includes Fernald Legal Database) / Albany 

Research Center

The 1958 symposium on uranium industry occupational health 

experiences.

09/30/2003 1

DOE Legacy Management - Westminster Complex-wide external dosimetry technical basis document, 

plutonium/actinide recovery history, lifetime dose calculations from 

systemic burden and lung count data, technical services quarterly 

report, Elza Gate bioassays sampling logs, NIOSH worker study 

protocol comments, and reports of analysis.

01/14/2016 6

DOE Nuclear Materials Management and Safeguards 

System (NMMSS)

Material transfers between Y-12 and Rocky Flats, Y-12 thorium 

inventory, and transactions tables and graphs.

12/17/2019 3
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32 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

DOE Oak Ridge Operations Material accountability reports, description of thorium processing, 

safety meetings, PCB meetings, bioassay results, external exposure 

results, TLD processing, fluorine control, artificial urine reports, 

asbestos worker files, the mobile body counter, U-233 history and 

inventories, trip reports, TLD problems, respiratory program 

occurrence report, periodic progress reports, and environmental 

reports. 

01/13/2014 66

DOE Oak Ridge Operations Records Holding Task Group 

(RHTG) Vault

Building index, contamination control, discontinuation of DuPont film, 

employee work history records, external exposure reports, film badge 

program, foundry beta radiation control, health physics records, 

internal exposures at Y-12, personnel participating in decontamination 

work, monthly health physics report, collection and recovery of 

airborne tuballoy, monthly production reports, production statistics 

and thorium inventories, radiological incidents, radiological surveys, 

reduction of radiation exposures, technical basis for beta skin dose 

calculations at the Y-12 plant, uranium dust concentrations, urinalysis 

and whole body count information, African Metals invoices, materials 

in 0101 area - Clinton Engineer Works, review of shipment recovery 

values, and the storage of U-235 from Los Alamos at Clinton Engineer 

Works.

02/10/2020 165

DOE Office of Scientific and Technical Information 

(OSTI)

Closed-cycle beta process, alpha II calutron development, uranium 

recovery by spray cleaning, thorium receipts, radiological surveys, 

pocket meter logbook notes, material transfers, coating of metallic 

thorium, material inventories, health physics logbooks, personnel 

monitoring, internal exposure study, applied health physics program 

review, calibrating and reading TLDs, periodic reports, and airborne 

uranium.

09/24/2018 86

DOE Portsmouth Paducah Project Office (PPPO) Transfers of enriched uranium to Y-12, transfers of Reduction Pilot 

Plant contaminated scrap to Y-12, 1950-1951 Oak Ridge National Lab 

flash estimates, neutron threshold detection modification project, and 

confirmatory accountable material inventory and measurements.

02/20/2020 7

East Tennessee Technology Park (ETTP) & Oak Ridge 

Gaseous Diffusion Plant (K-25)

Special form material procedures, health physics procedures, 

implementation plan for DOE Order 5480.11, the ETTP internal 

dosimetry program, technical basis, and evaluations, 10 C.F.R. 835 

implementing program documents, worker safety and health program 

documents, a nondestructive assay survey, 1958 radiation protection 

training programs, a radiological work authorization, and Oak Ridge 

Reservation annual air emission reports. 

01/24/2019 46
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33 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Federal Records Center - Atlanta Uranium tolerances, finger film, biological research at Mound, tritium 

information, and an Oak Ridge Operations Office health protection 

status report.

08/12/2004 5

Federal Records Center - Boston Personnel termination exposure summaries. 04/27/2012 1

Federal Records Center - Chicago Contamination control limits, a tritium release limits position paper, 

radiological control manuals, and technical basis documentation.

06/20/2013 6

Federal Records Center - Dayton Radiation dose determinations from indium foils in multi-plant 

security badges, limits for material from K-25 and Y-12 potentially 

contaminated with tritium, a Health Physics Division annual report, 

transfers of highly enriched uranium, a RCRA facility investigation, 

K-25 closure plans, and dose estimates for a Y-12 incident.

06/06/2014 9

Federal Records Center - Denver Mortality among radiation workers at a plutonium weapons facility, 

beryllium purchasing, fire protection workshop proceedings, a 1967 

review of criticality accidents, a reference to Y-12 degraded building 

conditions, and a listing of mixed waste streams.

09/12/2017 6

Federal Records Center - Kansas City Reports of urinalysis with sample routing logs, Tiger Team findings, a 

1990 de-identified annual exposure report summary, and the process 

for handling contaminated parts returned to Kansas City Plant.

10/09/2013 5

Federal Records Center - Lee's Summit DOE unusual incident reports, a volumetric release analysis, 

environment, safety, and health performance indicators, 1988 bioassay 

results, a West Valley fact book, analyses of Tiger Team findings, 

waste minimization, mixed waste evaluation and strategies, DOE 

safety and health indicators, and an effluent system report.

06/08/2016 40

Federal Records Center - San Bruno Beta run reports, personnel medical records handling, personnel 

assignment logs, schedule for track B, a personnel dosimetry 

intercomparison, medical and health physics quarterly reports, 

plutonium and fission products metabolism, and health chemistry 

accident reports.

02/12/2018 14

Feed Materials Production Center (FMPC) / SRDB Oak Ridge Reservation Environmental Report for 1988 Volume 1: 

Narrative, Summary, and Conclusions.

12/18/2020 1

Fernald / SC&A Mobile in-vivo radiation monitoring laboratory brochure. 06/26/2003 1

General Atomics The 1958 criticality incident at Y-12. 08/16/2005 1

Goldberg, Persky, and White PC - Mancuso Collection A 1973 contractor list, a records retention discussion, correspondence, 

the health and mortality study manual draft, annual film badge and 

bioassay summaries 1947-1968, and a local news article regarding a 

small fire in 1976.

01/10/2017 9

Hagley Museum & Library General history of Clinton Engineer Works, race for the bomb, the 

Hanford story, and uranium experimental program on heat treatment.

09/29/2010 8
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34 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Hanford In-vivo counting method for determining the uranium lung burden, 

annual and monthly progress reports, environmental monitoring and 

protection committee information, smelting uranium-contaminated 

ferrous metal scrap, production of tritium, health physicist reports, a 

wastewater treatment review, inventories, material losses, uranium 

mass balance project document index and attachments, accountability 

reports, accountability survey data, and inspection criteria for enriched 

uranium powder.

04/16/2019 61

Hanford / SRDB Health Physics Survey of Ferrous Metal Smelting Operation. 04/07/2020 1

Idaho National Laboratory (INL) Material transfers between Y-12 and INL facilities, handling of Y-12 

material at INL, correspondence, visitor badge reports, criticality 

safety evaluations, a documented communication, a list of 

publications, visitor traffic logs, a contaminated rail car report, ICPP 

Visitor Cards, and employee previous exposure histories.

11/19/2018 162

INL Electronic Document Management System (EDMS) The results of an EDMS keyword search. 06/29/2016 1

Interlibrary Loan Environmental levels of radioactivity at Atomic Energy Commission 

installations, work history reports for oxide conversion facility, 

proceedings of a short criticality safety course, the Seaborg journal, 

and the proceedings of an incineration conference.

05/29/2012 24

Internet - Defense Technical Information Center (DTIC) An occupational dose reconstruction bibliography, uranium alloy 

metallurgy bibliography, defense nuclear facilities safety board reports 

to Congress, actinide research quarterly reports, physical metallurgy of 

uranium alloys, the characterization of enriched uranium oxide 

particles, best manufacturing practices, Y-12 nuclear forensic 

capabilities and experience, hollow-anode ion source for the cyclotron, 

and the Defense Nuclear Facilities Safety Board 23rd annual report to 

Congress.

03/26/2019 25

Internet - DOE Environmental assessments of proposed Y-12 projects and effluent 

releases.

01/09/2014 2

Internet - DOE Comprehensive Epidemiologic Data 

Resource (CEDR)

Health physics hygiene progress reports and the impact of downsizing 

and reorganization on employee health and well-being at the DOE Y12 Plant.

01/23/2010 3

Internet - DOE Hanford Declassified Document Retrieval 

System (DDRS)

Fourth Atomic Energy Commission Air Cleaning Conference, 

specifications for Savannah River Site slugs, periodic department 

reports, trip reports, and a shipment of uranium rods to Y-12. 

09/22/2015 9

Internet - DOE Health, Safety, and Security (HSS) 10 C.F.R. 835 exemption requests and the twenty-fourth DOE annual 

radiation exposures report.

02/07/2017 3
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

35 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - DOE Legacy Management Preliminary survey of the Elza Gate warehouse area, removal of 

uranium from soil, beryllium-associated worker registries, annual 

occupational exposure reports, a former worker medical screening 

report, the Legacy Management strategic plan comments resolution 

legend, and documentation supporting the overpacking of waste 

thorium at Fernald including Y-12 generated waste.

04/08/2019 13

Internet - DOE Legacy Management Considered Sites A 1951 monthly progress report. 10/25/2007 1

Internet - DOE National Nuclear Security Administration 

(NNSA) Library

Violation citations related to a uranium fire, the final site-wide 

environmental impact statement, the history of the Nuclear Materials 

Management and Safeguards System, and the consolidation of the 

site's nuclear footprint.

11/16/2015 5

Internet - DOE Noncompliance Tracking System (NTS) Noncompliance with Nevada Test Site waste acceptance criteria, a 

discussion of isolated non-uranium contamination areas, inadequate 

control of materials used in maintenance of enriched uranium oxide, 

calibration program deficiencies, a glovebox fire, deficiencies in 

radiological work permit compliance, missed routine bioassay 

samples, and unanalyzed material in Building 9720.

03/11/2019 9

Internet - DOE Oak Ridge Operations Release of a parcel of land to the city of Oak Ridge, the demolition of 

Building 3704, photographs of Building 9401-2, environmental waste 

management plans, and the 2016 Oak Ridge Reservation annual 

environmental report.

01/07/2019 8

Internet - DOE Occurrence Processing and Reporting 

System (ORPS)

Personnel contamination reports and roll-ups, legacy contamination 

discoveries, legacy contamination roll-ups, contaminated items 

discovered in areas not controlled for contamination, personnel intakes 

of radioactive material, radioactive material spills, uranium fires, and 

criticality safety infractions.

09/14/2020 76

Internet - DOE Office of Scientific and Technical 

Information (OSTI)

The 2006 Oak Ridge Reservation annual environmental report, a 1958 

Argonne National Laboratory Chemical Engineering Division report, a 

2016 air emissions report, pedestrian special nuclear material 

monitors, fuel fabrication research and reports, transportation plans, 

quality assessments, an analysis of personnel error occurrence reports, 

a summary spent fuel report, materials characterization capabilities of 

DOE laboratories and production plants, and a scoping package for 

environmental remediation.

10/26/2020 27
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36 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - DOE OpenNet Criticality accident at the Y-12 Plant, declassification of the quantity 

of enriched lithium produced at Y-12, Manhattan District history, 

monthly status and progress reports, semiannual reports of the Atomic 

Energy Commission, operational accidents and radiation exposure 

experience, release of radioactivity to the environs request by AEC, 

uranium dust exposure and lung cancer risk in four uranium processing 

operations, trip reports, Oak Ridge Institute of Nuclear Studies 

medical research reports, a californium-252 report, fuel slug studies, 

Manhattan Project field progress reports, material transfers, a plant 

tour, National Radiobiology Project interviews, Massachusetts General 

Hospital uranium study, calculation of potential incident doses, 

radiobiology reports, neutron exposure dosimetry by in-vivo sodium24 measurements, organization charts, material transfer security 

requirements, material balance reports, a beryllium study surveillance, 

and an injury claim.

06/15/2020 157

Internet - DOE OPEXShare Uranium Accumulation Discoveries at Y-12. 07/08/2020 1

Internet - DOE OSTI Energy Citations Clean atmosphere approach to radiological decontamination of 

concrete surfaces, model for uranium lung clearance at the Y-12 Plant, 

Y-12 discharge of enriched uranium to the sanitary sewer, study of 

TLD beta calibration factor for exposure to depleted uranium, coaxial 

germanium detectors in the Y-12 in-vivo monitor, disposal of United 

Nuclear Company materials at Y-12, environmental survey report, 

modeling of Elza Gate contaminated material, a Pinellas Plant 

feasibility study, a report on remediation through natural phenomena, a 

mathematical model for lung counting, the feasibility of in-vivo 

thorium measurements, ORNL Chemical Technology Division reports, 

a 2011 DOE occupational radiation exposure report, a nuclear accident 

dosimetry intercomparison study, the disposal of spent nuclear fuel, 

and the abstracts from a pollution prevention conference. 

08/28/2013 54
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37 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - DOE OSTI Information Bridge DOE Complex buried waste characterization assessment, Conversion 

and Blending Facility highly enriched uranium to low enriched 

uranium as uranium hexafluoride, disposition of highly enriched 

uranium obtained from the Republic of Kazakhstan environmental 

assessment, electromagnetically enriched isotopes inventory, 

environmental evaluation and reports, export license issued for DOE 

Oak Ridge for shipment of uranium-235, human radiation 

experiments, in-vitro data and comments, list of ERDA radioisotope 

customers, occupational dose reduction, post construction report for 

the United Nuclear Corporation disposal site, radiological risk 

assessment of a radioactively contaminated site, remedial investigation 

of Bear Creek Valley at the Oak Ridge Y-12 Plant, sampling approach 

for characterization of the Scarboro community, testing of the Y-12 

Plant criticality accident alarm system detectors at the Sandia Pulsed 

Reactor Facility, metal fabrication program for the Clinton 

Engineering Works and the Hanford Engineering Works including the 

dummy slug program, waste vitrification projects, Y-12 salvage yard 

scrap metal characterization study, Y-12 Plant solid waste 

management system, a beryllium exposure assessment, a uranium 

hydride report, and hazardous and mixed waste generation.

08/26/2013 172

Internet - DOE OSTI.Gov (formerly OSTI SciTech 

Connect)

High-level radioactive waste reports, low-level radioactive waste 

reports, spent nuclear fuel strategic plans, spent fuel storage, 

environmental reports, groundwater protection and quality reports, 

waste generation and pollution prevention reports, a tank 

characterization survey, a Y-12 Tiger Team assessment, dosimetry 

quality assurance, the status of environmental initiatives, periodic 

project reports, life cycle analysis approach to D&D projects, strategic 

special nuclear material inventory differences, an Oak Ridge dose 

reconstruction report, a SNAP reactor program progress report, and 

control technology for radioactive atmospheric emissions.

08/28/2018 120

Internet - Energy Employees Claimant Assistance Project 

(EECAP)

A RCRA landfill analysis for the United Nuclear Corporation disposal 

site, assessment of enriched uranium storage safety issues, 

Development Division periodic reports, operation of the chip oxidation 

facility, uranium removal from contaminated soils, radiological 

analysis of groundwater data, and reduction of airborne radioactivity 

levels at the Building 9201-5 arc melt sawing operation.

03/26/2014 14
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38 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - Google Accountability and control of sealed radioactive sources, annual site 

environmental reports, Clinton Engineer Works photos, Clinton 

Laboratory expands to Y-12 buildings, depleted uranium operations at 

Y-12, division progress reports, Eastman at Oak Ridge during World 

War II, environment monitoring assessment and reports, 

epidemiological studies, evaluation of iodine-131 releases, historical 

evaluation of the film badge dosimetry program at Y-12, liquid waste 

disposal at Oak Ridge National Laboratory, major relocation of highly 

enriched uranium completed at Y-12, Manhattan Engineer District 

history, neutron and gamma dosimeter intercomparison study, Oak 

Ridge, Tennessee, warehouses site fact sheet, operating Oak Ridge's 

calutrons, radiological incidents, site X, Oak Ridge, Tennessee (map), 

status of highly enriched uranium processing capability at Y-12 

building 9212, study of metal hydrides, toxicological profile for 

uranium, Oak Ridge 86-inch cyclotron, urine bioassay program, 

personal air sampling (PAS) data in the internal dosimetry program, 

Y-12 history and fact sheet, environmental restoration, DOE 

occupational radiation exposure reports, characterization of 

contaminated scrap metal, oral history interviews, transuranic waste 

management, the characterization strategy for Building 9201-5, 

contractor performance evaluation reports, the determination of 

thorium in thorium metal, unexpected uptakes, Project Sapphire dose 

rate analysis, IAEA technical reports, a plutonium experiment report, 

and a Y-12 fact sheet. 

08/18/2020 545

Internet - Hathitrust A 1962 dosimetry badge orientation experiment. 10/21/2015 1

Internet - Health Physics Journal Identification of Oak Ridge Reservation emission sources, a urinalysis 

intercomparison study, an analysis of cesium body burdens, the 

retention of uranium in the chest, radioactivity distributions in the 

metallurgical processing of thorium, and a comparison of lung dose 

estimates from air sampling and bioassay data.

03/26/2019 7

Internet - Idaho National Laboratory (INL) Shipments of purified uranium powder to Oak Ridge. 07/13/2016 3

Internet - International Atomic Energy Agency (IAEA) The status of stable isotope enrichment and services. 12/19/2016 1

Internet - Journal of Occupational and Environmental 

Hygiene

No relevant documents identified. 03/26/2019 0

Internet - National Academies Press Complex-wide safety and health management, research opportunities 

in D&D projects, [Name redacted] biographical memoirs, 

contaminated sites risk-informed decision making, and radioactive 

waste reports.

06/01/2020 6
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

39 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - National Institute for Occupational Safety and 

Health (NIOSH)

Special exposure cohort petition evaluation reports, NIOSH residual 

radioactive and beryllium contamination reports, designation of 

additional members of the SEC, the minutes of Work Group meetings, 

the Kansas City Plant issues matrix, and an Advisory Board on 

Radiation and Worker Health review of the Y-12 site profile.

12/16/2020 38

Internet - National Service Center for Environmental 

Publications (NSCEP) (formerly NEPIS)

Environmental radiation data, environmental cleanup standards and 

regulations, transuranium elements dose limits and radiation 

protection, Y-12 records of decision, Superfund reports to Congress, 

and an overview of waste solidification and stabilization at Superfund 

sites. 

02/09/2016 19

Internet - National Technical Information Service (NTIS) Feasibility study of the correlation of lifetime health and mortality 

experience of AEC and AEC contractor employees progress reports.

08/21/2006 2

Internet - Nuclear Regulatory Commission (NRC) 

Agencywide Document Access and Management 

(ADAMS)

DOE inventory report, evaluation of the potential for recycling of 

scrap metals from nuclear facilities, feasibility study for the United 

Nuclear Corporation disposal site at the Oak Ridge Y-12, integrated 

database U.S. spent fuel and radioactive waste inventories, projections, 

and characteristics, a soil management plan for the Oak Ridge Y-12, 

disposition of surplus highly enriched uranium, environmental impact 

statements, a Y-12 safety analysis report, advance notifications of 

shipments, facility hazard assessments, export licenses and shipments, 

NRC export license applications, receipt of fuel from the BWX 

Technologies CX-10 reactor, and a 60-day notification of a materials 

transfer incident. 

05/11/2020 137

Internet - Oak Ridge National Laboratory (ORNL) ORNL Division and Laboratory periodic reports mentioning Y-12, 

radiation safety for Y-12 Building 9204-3 isotope separation 

operations, report on a calutron ion source, the recovery of uranium 

from acid liquors, a 1979 thorium utilization progress report, an 

Isotopes Development Center research planning meeting, and Oak 

Ridge Reservation annual environmental reports. 

06/18/2019 169

Internet - Portsmouth Gaseous Diffusion Plant The 1980 DOE Analytical Services Forum. 09/07/2009 1

Internet - University of North Texas The evaluation of Organic Moderated Reactor Experiment fuel 

elements containing uranium oxide from Oak Ridge and the 

specification for Y-12 uranium in the High Flux Isotope Reactor fuel 

elements.

02/04/2020 2

Internet - US Army Corps of Engineers (USACE) A 2016 Formerly Utilized Sites Remedial Action Program (FUSRAP) 

update.

05/17/2018 1

Internet - Washington State University (U.S. Transuranium 

and Uranium Registries)

No relevant documents identified. 04/08/2019 0
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

40 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Internet - Y-12 Y-12 anecdotes including one on thorium production. 08/01/2018 1

Iowa State University Library An interview with [Name redacted]. 09/18/2013 1

Iron Mountain Storage Facility, Cranberry, PA Survey of control over source and special nuclear materials, National 

Distillers and Chemicals Corporation.

09/11/2006 3

Kansas City Plant Statement of [Name redacted] before the subcommittee on Military 

Procurement Committee on National Security, US House of 

Representatives, radiological incidents, receipt of potentially 

contaminated parts, radiological surveys and air samples, operations 

reports, and dosimetry services.

03/04/2015 21

Kansas City Plant / SC&A Notes from the review of Kansas City Plant classified documents. 08/16/2013 1

Lawrence Berkeley National Laboratory (LBNL) Laboratory contracts 1948. 02/06/2007 1

Lawrence Berkeley National Laboratory (LBNL) / SC&A Long-range studies of uranium workers and Oak Ridge radiation 

worker population.

05/13/2009 1

Lawrence Livermore National Laboratory (LLNL) Project Pluto meeting minutes, a glove box incident report, 

determinations of possible excursion yields and exposure rates, 

feasibility of liquid material transfers, and the Rocky Flats body 

counter.

11/16/2017 11

Los Alamos National Laboratory (LANL) Excursions at the Oak Ridge criticality experiments facility, 

nonnuclear consolidation environmental assessment, polonium 

contamination at Pajarito, low-level mixed waste streams for the DOE 

Complex, corrected information on a plutonium shipment, a uranyl 

nitrate slurry problem, decontaminating plutonium from oralloy parts 

for Y-12, radioactive waste disposal and related issues, and reference 

to a Y-12 document in a LANL radiological work permit.

10/14/2019 12

Los Alamos National Laboratory (LANL) - LAHDRA Waste minimization at a plutonium processing facility, a low-level 

complex-wide mixed waste report, spent fuel inventories, and an 

environmental impact statement for the storage and disposition of 

weapons-usable fissile material.

12/13/2007 5

Mel Chew & Associates A 1994 radiation exposure summary, laboratory procedures for 

thorium analyses, individual and group exposure histories, fecal 

uranium measurements, the uranium in urine program, recycled 

uranium data spreadsheets, and plutonium urine results.

12/14/2014 62

Metals & Controls Corp Analysis of possible nuclear material losses and possible liabilities 

associated with present fuel manufacturing.

08/24/2004 1

MJW Proceedings of a short nuclear criticality safety course. 10/16/2003 1
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

41 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Mound Disposition of depleted salvage material, exposure to polonium from a 

neutron source, fabrication of weapon components, a shipment of 

irradiated bismuth slugs, polonium characteristic X-rays, polonium 

hazards, and correspondence concerning a lithium compound.

05/18/2010 11

Mound Museum Schedule of material transfers. 07/14/2008 1

National Archives and Records Administration (NARA) - 

Atlanta

AEC handbook on Oak Ridge operations, annual health protection 

review, bioassay results and procedures, calutron beam study, control 

of radiation hazards by Carbide and Carbon Chemicals Division, 

environmental data, equipment numbering system, film badge program 

description, hazards of piles at Y-12, monthly accountability reports, 

organization charts, personnel exposure data, progress reports, 

radiological and criticality incidents, radiological surveys, report of 

annual health protection review - New Brunswick Lab, reports of 

destruction of classified material, radiochemistry reports, shipments 

from Metal Hydrides to AEC facilities, shipping receipts, work done at 

Iowa State College, first aid stations, and handling fissionable 

material.

09/01/2015 147

National Archives and Records Administration (NARA) - 

Atlanta / SC&A

Decontamination of gloves. 09/26/2003 1

National Archives and Records Administration (NARA) -

Chicago

Fuel preparation for the ZPR-III Reactor. 06/12/2015 1

National Archives and Records Administration (NARA) -

College Park

Meteorological conditions, machining of uranium metal, 

accountability reports, thorium reports, researcher notes, Manhattan 

District history sections, and monthly status and progress reports.

03/11/2014 23

National Archives and Records Administration (NARA) -

Kansas City

Historical information from property insurance association on Niagara 

Falls Storage Site / African Metals leased areas, a survey of the 

Nuclear Chemicals and Metals Facility before and after a shipment to 

Y-12, radon emission data, TLD occupational exposure reports, a trip 

report, and the 1995 transuranic waste baseline report.

07/11/2016 6

National Archives and Records Administration (NARA) -

Seattle

Material transfers and a continuous air monitor calibration. 08/23/2017 5

Nevada Test Site (NTS) The Y-12 electron beam welder, references to Y-12 bioassay 

protocols, RWP sign-in sheets, and shipments of reactor fuel and waste 

from NTS to Y-12.

12/12/2018 6

New York State Archives A Manhattan District history section, SF material accountability 

reports 1952-1958, and waste disposal at Lake Ontario Ordnance 

Works.

03/20/2012 3
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

42 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

New York Department of Environmental Conservation Recovery of uranium from Sylvania scrap and disposal of special 

material under Contract AT(40-1)-2558.

07/31/2008 2

NIOSH Production and use of recycled uranium, audit report confirmatory 

bioassay testing at selected sites, highly enriched uranium safety and 

health vulnerabilities associated with storage of highly enriched 

uranium, Los Alamos Scientific Laboratory information, 

nondestructive testing of uranium, radioactive waste shipment, 

recycled uranium mass balance project, history of the Oak Ridge 

National Laboratory's first 25 years, strikes at Y-12, the evaluation of 

health physics problems in thorium processing, trip reports, AEC 

reports to Congress, documented communications, worker outreach 

meeting minutes, recycled uranium processing at Fernald, neutron 

dose assignment white paper, ORAU report on estimating radiological 

dose, Y-12 history documents, SC&A reviews and NIOSH responses, 

an evaluation of the Pb-212 lung count detection limit, and an update 

for the Advisory Board on Radiation and Worker Health.

12/02/2020 74

NIOSH - Health Related Energy Research Branch (HERB) 

Library

Oxide conversion facility work history reports. 09/08/2003 1

NIOSH / SC&A BWXT-ORAU correspondence 2003-2005, recycled uranium project 

report, highly enriched uranium working group reports, Np-237 and U238 alloy radiation safety requirements, remarks on personnel 

monitoring at Y-12, technical basis document for the internal 

dosimetry program at Y-12, uranium urinalysis program, and a Y-12 

Complex description.

02/05/2009 16

NIOSH OCAS Claims Tracking System (NOCTS) A 1957 special separations logbook and a log entry regarding an Am241 lung burden.10/16/2018 2

Nuclear Regulatory Commission (NRC) Public Document 

Room

A trip report, the sixth intercomparison of nuclear accident dosimeters, 

the draft environmental assessment for treatment of low-level and 

mixed waste, in-vivo counts for two Kerr-McGee employees involved 

in a thorium explosion and the Town of Tonawanda, NY, a 

radiological contingency plan, characterization of a Mallinckrodt 

plant, U-233 report, and references to Y-12 in a NUMEC license 

renewal application.

04/23/2018 10
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

43 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Oak Ridge Associated Universities (ORAU) Brief history of the Y-12 external monitoring program, correction 

factors for film badge data, dosimetry records and radiation hazards 

questionnaire, film badge data, names of persons having dosimetry 

information, radiation dosimetry for epidemiologic lung cancer study, 

history of buildings at Y-12, information on the calutron program for 

uranium enrichment, plutonium urinalysis results, health physics 

reports for buildings and departments, polonium urinalysis reports, 

uranium and plutonium urinalysis reports, individual employee 

bioassay reports, tritium urinalysis reports, Building 9805-1 tritium 

reports, high dose investigation reports, and letter regarding worker 

radiation exposure data used in epidemiological studies.

09/09/2020 231

Oak Ridge Associated Universities (ORAU) / Mel Chew & 

Associates

Tritium urinalysis reports. 05/14/2012 4

Oak Ridge Institute for Science and Education (ORISE) Data collection and validation for the Oak Ridge nuclear facilities 

mortality study.

06/11/2003 1

Oak Ridge Library for Dose Reconstruction Status report on Clinch River study, high-flux isotope reactor 

description, engineering development of hydraulic fracturing as a 

method for permanent disposal of radioactive wastes, contaminant 

releases, uranium releases, annual applied health physics reports, 

environmental levels of radioactivity, aerial radiological surveys, 

annual environmental reports, waste disposal reports, recovery of 

uranium from fiberglass air filters, incident reports, historical uranium 

releases, fallout measurements, material accountability reports, stack 

sampling, facility and department periodic reports, analysis of the 

1989 UF6 release, and worker mortality rates. 

08/15/2011 301
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

44 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Oak Ridge National Laboratory (X-10) Radiological incidents, history of the Analytical Chemistry Division of 

Oak Ridge National Laboratory, Aircraft Nuclear Propulsion Project 

progress report, cyclotron operations, electromagnetic isotope 

separations, evaluation of neutron dosimetry, exposures received from 

typical diagnostic X-ray examinations at ORNL, health physics 

instrument manual, neutron dosimetry with the ORNL badge, Oak 

Ridge 86-inch cyclotron, X-ray facility reviews, production of 

radioisotopes in the ORNL 86-inch cyclotron, quarterly progress 

report, radiation safety manual, stable isotope separation in calutrons, 

technical basis for nuclear accident dosimetry, inventory of 

electromagnetically enriched isotopes, X-10 medical X-ray 

compliance survey, Y-12 film monitoring program, releases of thorium 

in Building 9204-1, 86-inch cyclotron target ruptures, area, equipment, 

and personnel contamination occurrence reports, periodic ORNL 

Division reports including material accountability, isotopic power 

materials, isotopes development center, and operations and individual 

dosimetry records. 

03/31/2016 290

ORAU Team Accounting for incomplete personal monitoring data on penetrating 

gamma doses, exposure matrix for the Mallinckrodt Chemical 

Company, effect of threshold energy and angular response of NTA 

film on missed neutron dose at Y-12, annual report radiation exposures 

for DOE and contractor employees, radiological incidents, external 

radiation monitoring at Y-12, health and mortality among contractor 

employees at DOE facilities, history and evaluation of the film badge 

dosimetry program at Y-12, potential missed dose to nuclear weapons 

assemblers, specific tables of isotopic production, Tiger Team 

assessment of the Pantex Plant, Y-12 exposure database, analysis of 

electronic personnel exposure data from Y-12, documented 

communications, technical basis documents, data capture strategies, 

technical information bulletins, thorium air sample data spreadsheet, 

Y-12 quarterly health physics reports, in-vivo input and output 

radiation monitoring reports, quarterly health physics and industrial 

hygiene reports, annual body counter reports, an example of actinium 

and lead body counting reporting, and neutron dose from highly 

enriched uranium. 

03/28/2019 153
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

45 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Paducah Gaseous Diffusion Plant Alpha hazards from neptunium, computer program for whole body 

count, disposal of stored "tru" waste, environmental assessments and 

reports, estimates of transuranium alpha fed to Paducah cascade, 

exposure assessments, health protection information on uranium metal, 

in-vivo monitoring results, inventory of radioactivity released to 

environment, land burial of radioactive waste at the Paducah Plant, 

licensing of byproduct material, neptunium and plutonium plant 

material balance, dust studies, radiation protection program, 

radioactive contaminants in Paducah scrap, radioactive effluent 

release, monitoring and control, radioactive waste management, 

radiological incidents, study of plutonium and fission products, 

technical basis for the Centralized External Dosimetry System, trip 

reports, waste disposal criteria, and Y-12 TLD results that include 

Paducah area dosimeters.

10/06/2006 13

Pantex Monitoring procedures for items from Y-12 received at Pantex. 07/19/2011 1

Personal Files – [Name redacted] The sixteenth through the twenty-first DOE annual reports of radiation 

exposure.

10/11/2006 6

Personal Files – [Name redacted] A DOE contractor health and mortality report. 04/06/2010 1

Personal Files – [Name redacted] Office of Oversight Radiological Protection task team reports, a 

DOELAP status report and handbook, dosimetry program reviews, 

Bechtel-Jacobs technical basis documents, a Building 9201-2 

characterization, the development of IMBA, a radiation dosimeter 

pamphlet, and meeting minutes.

07/16/2018 19

Reactive Metals, Inc. (RMI) Historic radionuclide releases from Oak Ridge Operations facilities, 

1987, a 1985 uranium release report, report of a 1985 Martin Marietta 

Energy Systems visit to RMI, and RMI's 1980, 1983, 1984, and 1987 

environmental management appraisals. 

08/17/2006 5

Rocky Flats Environmental Technology Site (RFETS) The flammability and explosion potential of transuranic waste and 

audit responses.

08/31/2012 2

Sandia National Laboratories-Albuquerque Technical basis for workplace air monitoring of airborne radioactive 

material at Y-12, Ross Aviation shipment surveys and documents, the 

1991-1993 ORNL bioassay QC program, Webdose database external 

doses 2006-2008, and approval of the revised Radiological Control 

Manual.

09/09/2014 7
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

46 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Savannah River Site (SRS) Dosimetry visitors cards, radiation survey log sheets, a trip report, 

material transfers, SRS monthly reports, the thoria fuel irradiation 

program, californium packaging facility, laboratory fume hood 

minimum acceptable face velocities, and the SRS response to the 1998 

DOE Bioassay Enforcement Moratorium.

02/28/2019 15

S. Cohen & Associates (SC&A) Assessment for acceptance of enriched uranium at Y-12, radiation 

worker health at Y-12, Oak Ridge reservation annual site 

environmental report, photographic film as a pocket radiation 

dosimeter, recycled uranium mass balance project information, a trip 

report, criteria for acceptance of enriched uranium at Y-12, incident 

reports, unclassified thorium documents, special nuclear material 

licensing, documents issued to SC&A by BWXT Y-12, and 

documented communications.

04/26/2011 21

SC&A / Atlanta NARA Thorium metal processes. 09/26/2003 1

SC&A / Idaho National Laboratory Environmental report, airborne radionuclide waste management 

information, a mercury shipment, a survey of waste management 

practices, and Idaho Chemical Processing Plant periodic reports.

06/24/2010 13

SC&A / Internet - DOE OpenNet Linking Legacies. 05/24/2017 1

SC&A / NIOSH The generation and flow of recycled uranium. 08/14/2003 1

SC&A / Y-12 Mobile lung counter data, and fires and explosives investigations. 07/28/2010 2

Science Applications International Corporation (SAIC) Annual summaries of whole body radiation exposures to external 

penetrating radiation, 1960-1973.

09/02/2004 14

SLAC National Accelerator Laboratory 1969 Visitor badge neutron and photon results. 01/29/2018 1

Southern Illinois University Nuclear fuel fabrication, Oak Ridge site description, observations on 

uranium exposures, visit requests, and the transcripts of Advisory 

Board on Radiation and Worker Health meetings.

11/01/2008 9

University of Colorado Norlin Library A formal safety program cost/benefit study. 04/10/2006 1

University of Rochester Radiation Safety Office Return of uranium peroxide to Oak Ridge, 1961 material 

accountability reports, and a 1961 nuclear materials management 

station code listing.

08/20/2008 3

University of Tennessee Library Creation of Clinton Engineer Works, a health physics report, health 

physics and exposure records, a calutron newspaper article, personnel 

monitoring records, the Biology Division Hot Laboratory, the 

decontamination of Building 9204-1, burial of Y-12 wastes, and a 

survey of Building 9206. 

10/11/2011 14
SEC-00250 ER Addendum 06-23-21 Y-12 Plant 

47 of 49 

Data Capture Information General Description of Documents Captured Date Completed Uploaded to 

SRDB

Unknown Annual radiation dose reports, annual environmental reports, 

designation of race tracks by number Y-12 and extension, dosimeter 

response characterization, estimation of radiation doses to the lungs of 

early uranium workers, excretion of uranium from mixed exposures 

under industrial conditions, fifth semiannual report of the atomic 

energy commission, flow of materials through the nuclear weapons 

complex, glossary of Y-12 coded terminology, health physics survey 

instruments used at Clinton, in-vivo method to determine uranium lung 

burden, Mallinckrodt Plant inspections, miscellaneous Fernald 

documents, monthly status and progress reports, neutron dose 

equivalent and energy spectra measurements at ORNL and Y-12, 

overview of the history of Y-12, protective equipment evaluation, 

radiation safety manual, radiological incidents, radiological surveys, 

relationship between in-vivo and urinalysis data collected, Rocky Flats 

site history, Simonds Saw & Steel material balance report, 

Westinghouse Nuclear Fuels Division and Westinghouse Atomic 

Power Development information, a Comprehensive Epidemiologic 

Data Resource brochure, and X-ray radiation measurements in 

calutron cubicles.

03/14/2011 230

Unknown / SC&A The 1991 DOE indoor radon study. 10/09/2003 1

Unknown / SRDB Environmental monitoring reports and environmental levels of 

radioactivity for Oak Ridge facilities.

12/18/2020 12

Unknown / Y-12 The Y-12 outdoor scoping survey. 06/10/2004 1

United States Army Corps of Engineers (USACE) Lake Ontario Ordnance Works document search and remediation 

reports.

11/29/2007 2

United States Enrichment Corporation (USEC) A 1977 radiation termination report, the ERDAM 0525 annual 

occupational exposure reporting form, and a US Navy report on 

radioactive wastes.

10/06/2006 3

Weldon Spring Analysis of long term data on uranium in air at Y-12. 11/29/2004 1

Westinghouse Site (MO) Accidental radiation excursion at Y-12, estimated lung exposure, invivo count results, and procedures and assignments for restricted 

personnel.

04/09/2009 7

Westinghouse Nuclear Fuels Division (WNFD) 1968 - 1972 Shipping information and orders. 04/24/2009 1

Y-12 / SC&A Medical examination reports, occupational medical review reports, 

environmental pollution and control data, radiation exposure data, and 

Y-12 specifications for recycle material receipts. 

07/28/2010 5

TOTAL 5,576
SEC-00250 ER Addendum 06-23-21 Y-12 Plant

48 of 49 

Table A1-2: Database Searches for the Y-12 Plant

Database / Source Keywords / Phrases Hits Selected

Defense Technical Information Center (DTIC) 

http://www.dtic.mil/dtic/ (Link no longer active)

COMPLETED 03/26/2019 

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

14,950 6

DOE Hanford Declassified Document Retrieval System

(DDRS) and Public Reading Room 

http://reading-room.labworks.org/Catalog/Search.aspx

COMPLETED 04/05/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

4 1

DOE Legacy Management Considered Sites 

https://www.lm.doe.gov/Considered_Sites/ (Link no longer 

active) COMPLETED 04/08/2019 

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

3,872 2

DOE National Nuclear Security Administration (NNSA) - 

Nevada Site Office 

https://nnsa.energy.gov/library

COMPLETED 04/01/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

1,468 4

DOE Noncompliance Tracking System 

https://nts.ntc.doe.gov/NTSReports/Search (Link no 

longer active) (Subscription required) 

COMPLETED 10/04/2018

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

158 1

DOE Occurrence Reporting and Processing System https://

orps.doe.gov/ORPS/orps.asp (Link no longer active)

(Subscription required) COMPLETED 10/04/2018 

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

817 0

DOE OpenNet 

http://www.osti.gov/opennet/advancedsearch.jsp (Link no 

longer active) COMPLETED 04/05/2019 

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

3,882 133

DOE OSTI.Gov 

https://www.osti.gov/search/

COMPLETED 04/22/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

409,550 50

Energy Employees Claimant Assistance Project (EECAP) 

http://www.eecap.org

COMPLETED 03/26/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

19 0

Google 

http://www.google.com

COMPLETED 04/09/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

4,732,597,100 36

Health Physics Journal 

http://journals.lww.com/health-physics/pages/default.aspx

COMPLETED 03/26/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

219 1
SEC-00250 ER Addendum 06-23-21 Y-12 Plant

49 of 49 

Database / Source Keywords / Phrases Hits Selected

Journal of Occupational and Environmental Hygiene 

https://oeh.tandfonline.com/ 

COMPLETED 03/26/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

9 0

National Academies Press 

http://www.nap.edu/

COMPLETED 04/08/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

15,124 0

National Service Center for Environmental Publications

(NSCEP) 

http://nepis.epa.gov/ 

COMPLETED 04/09/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

317 14

NRC ADAMS Reading Room 

https://adams.nrc.gov/wba/

COMPLETED 04/05/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

1,210 83

United States Army Corps of Engineers (USACE) 

http://www.usace.army.mil/ 

COMPLETED 04/08/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

10 0

U.S. Transuranium & Uranium Registries 

http://www.ustur.wsu.edu/

COMPLETED 04/08/2019

Database search terms and Internet URL are available in the Excel file 

called “Y-12 Rev 03, (SEC-00250) 02-15-2021” 

29 0