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? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Los Alamos National Laboratory Revision to the Special Exposure Cohort Petition Evaluation Report SEC\00109 James W.

Neton, Ph.D., CHP Associate Director for Science National Institute for Occupational Safety and Health Division of Compensation Analysis and Support September

2012 Denver, CO ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Background ? Previous NIOSH evaluations (SEC\00051, SEC\ 00061, and SEC\00170) have established SECs that include all employees from March 15,

1943 through December 31,

1975 ? Basis for the class was infeasibility of internal dose reconstruction for a number of radionuclides, including: ? Am, Cm, Np, Th, Sr ? Mixed fission and activation products ? ? ? ? Background―cont. ? The evaluation report for SEC\00051 recognized that the identified dose reconstruction issues might still exist for the post\1975 period ? On this basis, NIOSH qualified the current petition (SEC\00109) for evaluation ? ? ? ? ? ? ? ? ? ? ? ? ?? LANL Operations: 1976\2005 ? Weapons development and testing ? Critical assemblies, reactors, and reactor development ? Accelerators, x\ray equipment, and radiography sources ? Biomedical research ? Project Sherwood and fusion research ? Waste treatment and disposal ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Potential Radiation Exposure During the Class Period ? Internal sources of exposure ? Primary radionuclides ―Cs\137, H\3, Pu\238, Pu\239, uranium ? Exotic radionuclides as defined in SEC\00051 ―Mixed fission and mixed activation products ―Ac\227, Am\241, Cm\244, Np\237, Pa\231, Sr\90/Y\90, Th\ 230, Th\232 ? External sources of exposure ? Photon, beta, and neutron exposure from accelerators, reactors, x\ray machines, and radioactive materials ? ???? ? ? ? ? ? ? ? ? ? ? ? ? ? Previous Dose Reconstructions NIOSH OCAS Claims Tracking System Information available as of August 8,

2012 ? LANL claims submitted to NIOSH

1361 ? Claims with employment during the period evaluated (01/01/1976\12/31/2005)

863 ? Dose Reconstructions completed

627 (73%) ? Claims with start dates after 12/31/1975

386 ? Claims containing internal monitoring data

736 ? Claims containing external monitoring data

495 ? ? ? ? ? ? ? ? ? Petition Overview ? April 3, 2008:

42 CFR Part 83.13 petition received (SEC\00109) ? May 29, 2008: Petition qualified for evaluation ? January 22, 2009: NIOSH issued the initial SEC\

00109 Petition Evaluation Report (Rev. 0) ? Class evaluated: Service Support Workers from January 1,

1976 through December 31,

2005 ? NIOSH concluded that sufficient information was available for dose reconstructions ? No additional SEC class was recommended at that time ? ? ? ? ? ? ? ? ? ? ? ? ? Petition Overview―cont. ? Following additional review of the available data, NIOSH now finds that it lacks sufficient information to demonstrate feasibility of internal dose reconstruction for some radionuclides, including: ? Certain tritium compounds ? Fission and activation products ? Thorium ? Exotic alpha emitters, e.g., Am\241, Np\237, Ac\227, Pa\ 231, and Cm\244 ? ? ? ? ? ? Petition Overview―cont. ? August 13, 2012: NIOSH issued a revision to the SEC\00109 Petition Evaluation Report (Rev. 1) ? Revised previous decision to not recommend a class ? Class now recommended for all workers at LANL from January 1,

1976 through December 31,

1995 ? End date selection is based on NIOSH's presumption that LANL would have been in full compliance with

10 CFR