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SEC-00189 Oak Ridge National Laboratory (X-10)

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SEC-00189 Oak Ridge National Laboratory (X-10) SEC Petition Evaluation Report Petition SEC-00189 Report Rev #:0 Report Submittal Date: August 15, 2012 Subject Expert(s): Michael Domal, Roger Halsey Ray Clark, Keith Varnado Site Expert(s): N/A Petition Administrative Summary Petition Under Evaluation Petition # Petition Petition Qualification DOE/AWE Facility Name Type Receipt Date Date SEC-00189 83.13 July 18, 2011 October 11, 2011 Oak Ridge National Laboratory (X-10) Petitioner-Requested Class Definition All contractor employees, subcontractor employees, and AEC employees who were monitored or should have been monitored for any of the various radionuclides and fission products present at the X-10 plant while working in all areas at the Oak Ridge National Laboratory (X-10) from January 1, 1943 through December 31, 1952. Class Evaluated by NIOSH All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Oak Ridge National Laboratory (X-10) in Oak Ridge, Tennessee, from January 1, 1943 through July 31, 1955. NIOSH-Proposed Class(es) to be Added to the SEC All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Oak Ridge National Laboratory (X-10) in Oak Ridge, Tennessee, from June 17, 1943 through July 31, 1955, 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. Related Petition Summary Information SEC Petition Tracking #(s) Petition Type DOE/AWE Facility Name Petition Status N/A N/A N/A N/A Related Evaluation Report Information Report Title DOE/AWE Facility Name N/A N/A ORAU Lead Technical Evaluator: Michael Domal ORAU Peer Review Completed By: Michael Kubiak Peer Review Completed By: [Signature on File] 8/16/2012 Timothy D. Taulbee Date SEC Petition Evaluation Reviewed By: [Signature on File] 8/17/2012 J. W. Neton Date SEC Evaluation Approved By: {Signature on File] 8/17/2012 Stuart L. Hinnefeld Date Page 1 of 131 SEC-00189 08-15-12 ORNL (X-10) This page intentionally left blank 2 of 131 SEC-00189 08-15-12 ORNL (X-10) Evaluation Report Summary: SEC-00189 Oak Ridge National Laboratory (X-10) This evaluation report by the National Institute for Occupational Safety and Health (NIOSH) addresses a class of employees proposed for addition to the Special Exposure Cohort (SEC) per the Energy Employees Occupational Illness Compensation Program Act of 2000, as amended, 42 U.S.C. § 7384 et seq. (EEOICPA) and 42 C.F.R. pt. 83, Procedures for Designating Classes of Employees as Members of the Special Exposure Cohort under the Energy Employees Occupational Illness Compensation Program Act of 2000. Petitioner-Requested Class Definition Petition SEC-00189 was received on July 18, 2011, and qualified on October 11, 2011. The petitioner requested that NIOSH consider the following class: All contractor employees, subcontractor employees, and AEC employees who were monitored or should have been monitored for any of the various radionuclides and fission products present at the X-10 plant while working in all areas at the Oak Ridge National Laboratory (X-10) from January 1, 1943 through December 31, 1952. Class Evaluated by NIOSH Based on its preliminary research, NIOSH expanded the petitioner-requested class. NIOSH evaluated the following class: All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Oak Ridge National Laboratory (X-10) in Oak Ridge, Tennessee, from January 1, 1943 through July 31, 1955. NIOSH-Proposed Class(es) to be Added to the SEC Based on its full research of the class under evaluation, NIOSH has defined a single class of employees for which NIOSH cannot estimate radiation doses with sufficient accuracy. The NIOSH- proposed class includes all employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Oak Ridge National Laboratory (X-10) in Oak Ridge, Tennessee, from June 17, 1943 through July 31, 1955, 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. Feasibility of Dose Reconstruction Per EEOICPA and 42 C.F.R. § 83.13(c)(1), NIOSH has established that it does not have 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 maximum dose. Information available from the site profile and additional resources is not sufficient to document or estimate the maximum internal and external potential exposure to members of the proposed class under plausible circumstances during the specified period. 3 of 131 SEC-00189 08-15-12 ORNL (X-10) NIOSH determined that radioactive materials did not arrive on site until June 17, 1943 at the earliest. Principal sources of internal and external radiation for members of the proposed class included exposures to plutonium, uranium, thorium, mixed fission products, and various cyclotron-related radionuclides. Principal sources of external radiation also included reactors that operated during the proposed class period. NIOSH determined in its evaluation that it did not locate sufficient data, including bioassay results and air monitoring concentrations, to estimate with sufficient accuracy the total internal dose from exposures to all the principal sources of internal radiation during the period from June 17, 1943 through July 31, 1955. NIOSH found that it may be feasible to reconstruct internal doses to plutonium for employees during the period from January 1, 1944 through July 31, 1955. It may also be feasible to reconstruct the following internal exposures for a portion of the evaluation period: - Internal exposures to thorium from January 1, 1944 through December 31, 1947. - Internal exposures to uranium from January 1, 1949 through July 31, 1955. - Internal exposures to mixed fission products from January 1, 1950 through July 31, 1955. NIOSH has determined that cyclotron-related radionuclides produced at the nearby Y-12 Facility were processed at the ORNL facility during the period under evaluation. To allow cyclotron-related operations and exposures at the two sites to be collectively evaluated, NIOSH has reserved the evaluation of ORNL exposures to various radionuclides produced as a result of Y-12 cyclotron operations. The availability of ORNL (X-10) internal monitoring data is summarized in the following table. Summary Section: Available ORNL (X-10) Internal Monitoring Data Year Internal Sources 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 Plutonium Air Bio Air Bioassay Uranium No Data Bioassay Thorium Air Data No Data Bio Fission Products No Data Bioassay Reactor/Cyclo- Reserved for a joint ORNL (X-10) and Y-12 evaluation tron/Accelerator NIOSH found that external exposures could be reconstructed for all employees during the period from June 17, 1943 through July 31, 1955. 4 of 131 SEC-00189 08-15-12 ORNL (X-10) Prior to October 3, 1947, occupational medical X-rays were performed at Oak Ridge Hospital (an EEOICPA-covered site located on what was then the Clinton Engineering Works site). Starting October 3, 1947, occupational X-rays were performed on the ORNL site. Therefore, NIOSH has determined that it is applicable and feasible to reconstruct occupational medical X-ray exposures for ORNL (X-10) workers during period from June 17, 1943 through July 31, 1955. Pursuant to 42 C.F.R. § 83.13(c)(1), NIOSH determined that there is insufficient information to either: (1) estimate the maximum radiation dose, for every type of cancer for which radiation doses are reconstructed, that could have been incurred under plausible circumstances by any member of the class; or (2) estimate the radiation doses of members of the class more precisely than a maximum dose estimate. Although NIOSH found that it is not possible to completely reconstruct radiation doses for the proposed class, NIOSH intends to use any internal and external monitoring data that may become available for an individual claim (and that can be interpreted using existing NIOSH dose reconstruction processes or procedures). Therefore, dose reconstructions for individuals employed at ORNL (X-10) during the period from June 17, 1943 through July 31, 1955, but who do not qualify for inclusion in the SEC, may be performed using these data as appropriate. Health Endangerment Determination Per EEOICPA and 42 C.F.R. § 83.13(c)(3), a health endangerment determination is required because NIOSH has determined that it does not have sufficient information to estimate dose for the members of the proposed class. NIOSH did not identify any evidence supplied by the petitioners or from other resources that would establish that the proposed class was exposed to radiation during a discrete incident likely to have involved exceptionally high-level exposures, such as nuclear criticality incidents or other events involving similarly high levels of exposures. However, evidence indicates that some workers in the proposed class may have accumulated substantial chronic exposures through intakes of radionuclides, combined with external exposures to gamma, beta, and neutron radiation. Consequently, 42 C.F.R. § 83.13(c)(3)(ii) requires NIOSH to specify that health was endangered for those workers covered by this evaluation who were employed for at least 250 aggregated work days either solely under this employment or in combination with work days within the parameters established for one or more other SEC classes.
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