National Institute for Occupational Safety and Health

Overview of Changes to the Rocky Flats Plant Site 

Profile

LaVon Rutherford, CHP

DCAS Health Science Administrator

Advisory Board on Radiation and Worker Health 

Rocky Flats Plant Work Group Meeting

October 04, 2022
Overview

 Provide a summary of the major changes to the Rocky Flats 

Plant (RFP) Site Profiles

– RFP – Introduction, Rev. 02, 8/04/2020

– RFP – Site Description, Rev. 02, 8/20/2020

– RFP – X-ray, Rev. 03, 8/19/2019

– RFP – Occupational Environmental Dose, Rev. 03, 9/02/2020

– RFP – Occupational Internal Dose, Rev. 04, 9/01/2020

– RFP – Occupational External Dose, Rev. 03, 1/14/2019

 Provide a status of the revision of the RFP internal coexposure model.

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Summary of changes to RFP TBDs
RFP TBD - Introduction

 No substantive change other than indicating that the

other sections of the site profile were revised due to 

Advisory Board comments and items associated with 

SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

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RFP TBD – Site Description

 No substantive changes

 Updated to reflect Advisory Board comments and items 

associated with SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

 Updated references

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RFP TBD – X-rays

 Updated to reflect Advisory Board comments and items 

associated with SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

 Updated X-ray doses based on information presented in 

ORAUT-OTIB-0006, Revision 05

 Updated references

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RFP TBD – Occupational Environmental Dose (1 of 2)

 Updated to reflect Advisory Board comments and items 

associated with SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

 Added impact discussion on FBI raid in 1989

– Information from white paper developed and issued (2015) 

during SEC review

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RFP TBD – Occupational Environmental Dose (2 of 2)

 Updated internal intakes for consistency with external 

assumption

– Occupancy time updated 

 Updated onsite ambient values

 Attachment B was deleted

– Already discussed in a previous section

 Updated references

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RFP TBD – Occupational Internal Dose (1 of 2)

 Updated to reflect Advisory Board comments and items 

associated with SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

 Updated annotations and attributions

 Updated references

 Updated co-exposure study

– capture data from OCAS-TIB-0014

– Added intake rates for type SS plutonium

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RFP TBD – Occupational Internal Dose (2 of 2)

 Changed guidance for post-1989 plutonium mixtures to 

only assume 10 year aged

 Incorporated white papers associated with SEC-000192

– Potential exposure from neptunium

– Possible presence of magnesium-thorium alloys

– Exposure to tritium

– Exposure from the critical mass lab, and

– Impact of the FBI raid

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RFP TBD – Occupational External Dose (1 of 2)

 Updated to reflect Advisory Board comments and items 

associated with SEC-00192

 Identified current SEC classes associated with Rocky Flats 

and feasibility limitations

 Updated references

 Updated attributions and annotations

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RFP TBD – Occupational External Dose (2 of 2)

 Incorporated whitepapers associated with Gamma cell 

220 cobalt-60 irradiator

 Added additional guidance on

– The application of co-exposure dose

– Dosimetry gap analysis, and 

– Interpretation of external dosimetry record notations

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Status of Revising Rocky Flats Co-exposures 
RFP Co-exposure study status

 Rocky Flats co-exposure models being updated in 

accordance with IG-006, Criteria for the Evaluation and 

Use of Co-exposure datasets

 Rocky Flats Internal co-exposure update has started

– Being worked during downtime of other co-exposure 

updates

– Do not have a good completion estimate

 Do not have a good date for the start of the external coexposure model

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Questions?

For more information, contact CDC

1-800-CDC-INFO (232-4636)

TTY: 1-888-232-6348 www.cdc.gov

The findings and conclusions in this report are those of the authors and do not necessarily represent the 

official position of the Centers for Disease Control and Prevention.

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