Division of Compensation Analysis and 

Support

Program Evaluation Report

Document Number: DCAS-PER-033

Effective Date: 12/9/2011

Revision No. 0

Reduction Pilot Plant TBD Revision Page 1 of 3

Author: Signature on file Date: 12/9/2011 

 Dave Allen, HP Team Leader

Approval: Signature on file Date: 12/9/2011 

 J.W. Neton, Associate Director for Science

Supersedes: None

RECORD OF ISSUE/REVISIONS

ISSUE 

AUTHORIZATION 

DATE

12/9/2011

EFFECTIVE 

DATE

12/9/2011

REV. NO. 

0

DESCRIPTION

New document to determine affect of 

revising the Reduction Pilot Plant TBD 

on previously completed claims.

1.0 Description

The Reduction Pilot Plant1Technical Basis Document (OCAS-TKBS-0004) was issued

on 8/13/2008. This document superseded the Oak Ridge Associated University versions 

of this TBD (ORAUT-TKBS-0004).

2.0 Issue Evaluation

Several changes in the Dose Reconstruction methodology occurred in this revision to the 

TBD. Most changes reflect a decrease in the estimated dose. However, the estimate of 

internal dose increased from 1956 through 1963 and for 1978 and 1979. The inhalation 

estimate for operators went from approximately 3.83 pCi/day (1400 pCi/yr) to 44 

pCi/day. The original intake was the geometric mean of a lognormal distribution with a 

geometric standard deviation of 4.3. The new estimate is a single bounding value.

While the internal dose estimate increased, other exposure pathways decreased. Due to 

the nature of some of the changes, the magnitude of the effect on individual dose 

estimates will vary from claim to claim. 

3.0 Plan for Resolution or Corrective Action

3.1 Determining the potential population of claims

 

1 The Department of Labor changed the name of this site from the Huntington Pilot Plant to the Reduction 

Pilot Plant. The name change does not affect the NIOSH dose reconstruction. Therefore, the names are 

used interchangeably in this document.
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-033

Effective Date: 12/9/2011 Revision No. 0 Page 2 of 3

The criteria used to determine the population of claims potentially affected by this 

revision are:

1. Probability of Causation (PC) less than 50%;

2. Most recent version of the dose reconstruction approved by DCAS on or prior to 

August 13, 2008

3. Employed at the Reduction Pilot Plant between 1956 and 1963 or during 1978 or 

1979.

These criteria were used to generate the list of 32 potentially affected claims. 

3.2 Determination of claims which will not change due to TBD revision. 

The dose for each of the 32 claims was recalculated using all current dose reconstruction 

methods including the current version of the TBD. From that recalculated dose, a new 

probability of causation was determined. The table below shows the results of the 

original and revised PC.

Claim Original PC (%) Revised PC (%)

A 0.6 3.06

B 1.14 0.3

C 1.43 8.47

D 1.53 0.95

E 1.9 2.06

F 2.17 0.37

G 3.37 0.71

H 3.4 1.69

I 4.19 0.7

J 4.82 1.16

K 5.32 1.56

L 6.85 2.36

M 9.92 2.36

N 11.82 9.6

O 11.86 2.87

P 13.45 3.92

Q 13.8 12.04

R 13.85 21.63

S 16.07 3.27

T 16.39 27.43

U 18.34 24.86

V 19.02 38.31

W 20.2 39.31

X 21.2 38.25
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-033

Effective Date: 12/9/2011 Revision No. 0 Page 3 of 3

Y 24.12 33.57

Z 27.53 44.96

AA 33.94 42.17

AB 36.87 15.75

AC 37.22 5.86

AD 39.18 1.47

AE 39.2 22.55

AF 46.98 26.49

The TBD revision resulted in an increase in the PC for 12 of the 32 claims (37.5%) while 

the PC decreased for the remaining 62.5% of the claims. The highest revised PC did not 

exceed 50%. Therefore, NIOSH will not ask DOL to return any of the previously 

completed Reduction Pilot Plant claims based on the revision to the TBD.