Internal Dosimetry Coworker Intake and Exposure Model for the W. R. Grace Company, Erwin, Tennessee White Paper National Institute for Occupational Safety and Health March 1, 2019 Matthew G. Arno and Karen S. Kent Oak Ridge Associated Universities Team Thomas P. Tomes Division of Compensation Analysis and Support Page 1 of 40 This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution. White Paper Internal Dosimetry Coworker Intake and Exposure March 1, 2019 Model at the W. R. Grace Company, Erwin, Tennessee TABLE OF CONTENTS INTRODUCTION .......................................................................................................................... 6 PURPOSE ....................................................................................................................................... 6 BACKGROUND ............................................................................................................................ 7 BIOASSAY DATA ...................................................................................................................... 10 COWORKER INTAKE RATES BASED ON BIOASSAY (1965-1973) ................................... 11 EXPOSURE MODEL TO DEVELOP PLUTONIUM INTAKE RATES BASED ON AIRBORNE CONCENTRATION DATA (1976-1993) .......................................................... 12 ORAUT-OTIB-0070 METHOD TO DEVELOP PLUTONIUM INTAKE RATES (1974-1975) .............................................................................................................................. 12 REFERENCES ............................................................................................................................. 14 Attachment A, Plutonium Coworker Statistical Analysis Methods.............................................. 17 Bioassay Data ........................................................................................................................... 17 Analysis .................................................................................................................................... 17 Intake Modeling ........................................................................................................................ 17 Intake Assignment .................................................................................................................... 18 Plutonium Statistical Analysis Results ..................................................................................... 20 Attachment B, Plutonium Coworker Statistical Analysis Instructions ......................................... 28 Data Sources: ............................................................................................................................ 28 Instructions ................................................................................................................................ 28 Attachment C, Exposure Model To Develop Plutonium Intakes Based on Airborne Concentration Data ................................................................................................................... 30 Methods .................................................................................................................................... 30 Airborne Concentration Data .................................................................................................... 30 Analysis .................................................................................................................................... 32 Intake Modeling and Assessment ............................................................................................. 33 Attachment D, Plutonium Bioassay Program Review .................................................................. 36 1965 through 1973—Plutonium Production Period ................................................................. 36 1974 through 1989—Post-Production Period ........................................................................... 37 1990 through 1993—Plutonium Facility D&D ........................................................................ 40 Page 2 of 40 This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution. White Paper Internal Dosimetry Coworker Intake and Exposure March 1, 2019 Model at the W. R. Grace Company, Erwin, Tennessee Tables Table 1. Timeline of plutonium activities at W. R. Grace. ............................................................ 7 Table 2. Plutonium activity processed by project at W. R. Grace. ................................................ 8 Table 3. Summary of plutonium processes at W. R. Grace. .......................................................... 8 Table 4. Default plutonium assumptions, SEFOR MOX. ........................................................... 10 Table 5. Plutonium intake rates based on bioassay (Type M) (dpm/d). ...................................... 11 Table 6. Plutonium intake rates based on bioassay (Type S) (dpm/d). ........................................ 11 Table 7. Total alpha intake rates based on airborne concentration data (dpm/d). ....................... 12 Table 8. Plutonium intake rates (Type M) (dpm/d). .................................................................... 13 Table 9. Plutonium intake rates (Type S) (dpm/d). ..................................................................... 13 Table A-1. 50th and 84th percentile urinary excretion rates of plutonium gross alpha, 1967 to 1973 (dpm/d). .............................................................................................................. 18 Table A-2. Type M plutonium gross alpha intake rates (dpm/d). ................................................ 19 Table A-3. Type S plutonium gross alpha intake rates (dpm/d). ................................................. 19 Table C-1. Determination of plutonium vs. uranium areas. ........................................................ 31 Table C-2. Plutonium gross alpha air concentration results (1976 to 1993). .............................. 32 Table C-3. 50th--percentile plutonium intake rates (dpm/d). ...................................................... 33 Table D-1: Plutonium bioassay data in NOCTS 1974 through 1989. ......................................... 38 Figures Figure A-1. Predicted plutonium gross alpha bioassay results calculated using IMBA- derived plutonium gross alpha intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1967 to 1968, Type M .............................................................. 20 Figure A-2. Predicted plutonium gross alpha bioassay results calculated using IMBA- derived plutonium gross alpha intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1969 to 1971, Type M ............................................................... 20 Figure A-3. Predicted plutonium gross alpha bioassay results calculated using IMBA- derived plutonium gross alpha intake rates (line) compared with measured bioassay results (dots), 50th percentile, 1972 to 1973, Type M ............................................................... 21 Figure A-4. Predicted plutonium gross alpha bioassay results calculated using IMBA- derived plutonium gross alpha intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1967 to 1968, Type M ............................................................... 21 Page 3 of 40 This is a working document prepared by NIOSH’s Division of Compensation Analysis and Support (DCAS) or its contractor for use in discussions with the ABRWH or its Working Groups or Subcommittees. Draft, preliminary, interim, and White Paper documents are not final NIOSH or ABRWH (or their technical support and review contractors) positions unless specifically marked as such. This document represents preliminary positions taken on technical issues prepared by NIOSH or its contractor. NOTICE: This report has been reviewed to identify and redact any information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution. White Paper Internal Dosimetry Coworker Intake and Exposure March 1, 2019 Model at the W. R. Grace Company, Erwin, Tennessee Figure A-5. Predicted plutonium gross alpha bioassay results calculated using IMBA- derived plutonium gross alpha intake rates (line) compared with measured bioassay results (dots), 84th percentile, 1969