Proposed Rules. Proposed rule and opportunity for public comment
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/register/2011/01/25/2011-1500A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
BILLING CODE 3410-02-P DEPARTMENT OF ENERGY 10 CFR Part 835 [Docket No. HS-RM-09-835] RIN 1901-AA-95 Occupational Radiation Protection; Revision AGENCY: Department of Energy. ACTION: Proposed rule and opportunity for public comment. SUMMARY: The Department of Energy
(DOE)proposes to revise the values in an appendix to its Occupational Radiation Protection requirements. The derived air concentration values for air immersion are calculated using several parameters. One of these, exposure time, is better represented by the hours in the workday, rather than the hours in a calendar day, and is therefore used in the revised calculations. DATES: Public comments on the proposed revisions must be received on or before February 24, 2011. ADDRESSES: You may submit comments, identified by Docket No. HS-RM-09-835 and/or RIN 1901-AA-95, by any of the following methods: • *Federal eRulemaking Portal: http://www.regulations.gov.* Follow the instructions for submitting comments. • *E-mail: Judy.Foulke@hq.doe.gov.* Include Docket Number HS-RM-09-835 and/or RIN 1901-AA-95 in the subject line of the message. • *Mail:* Dr. Judith D. Foulke, Office of Worker Safety and Health Policy (HS-11), U.S. Department of Energy, 1000 Independence Avenue, SW., Washington, DC 20585. FOR FURTHER INFORMATION CONTACT: Judith Foulke,
(301)903-5865, *e-mail: Judy.Foulke@hq.doe.gov.* SUPPLEMENTARY INFORMATION: Background The requirements in title 10, Code of Federal Regulations, part 835 (10 CFR part 835), *Occupational Radiation Protection,* are designed to protect the health and safety of workers at DOE facilities. One situation that must be addressed is the exposure of workers to radioactive material dispersed in the air. Based on calculations involving doses to the organs of the body, levels of contamination in the air that will not cause the dose limits for workers to be exceeded are established for specified radionuclides. These values are given in appendix C. DOE first published, a final rule on December 14, 1993, (58 FR 65485), amending 10 CFR part 835. In the June 8, 2007, (72 FR 31903) amendment to part 835, DOE revised the values in appendix C to part 835, *Derived Air Concentration
(DAC)for Workers from External Exposure during Immersion in a Cloud of Airborne Radioactive Material.* The calculations done for the 2007 amendment were based on a 24-hour day. However, to be consistent with other occupational exposure scenarios, such as those used in developing the appendix A DACs, an 8-hour per day exposure scenario is more reasonable. Need for Revisions This proposed rule revises the values in appendix C to part 835, *Derived Air Concentration
(DAC)for Workers from External Exposure during Immersion in a Cloud of Airborne Radioactive Material.* List of Subjects in 10 CFR Part 835 Federal buildings and facilities, Nuclear energy, Nuclear materials, Nuclear power plants and reactors, Nuclear safety, Occupational safety and health, Radiation protection, and Reporting and recordkeeping requirements. Issued in Washington, DC, on January 11, 2011. Glenn S. Podonsky, Chief Health, Safety and Security Officer, Office of Health, Safety and Security. Accordingly, for the reasons set forth in the preamble, part 835 of Chapter III of 10 CFR is proposed to be amended as set forth below: PART 835—OCCUPATIONAL RADIATION PROTECTION 1. The authority citation for part 835 continues to read as follows: Authority: 42 U.S.C. 2201, 7191; 50 U.S.C. 2410. 2. Amend appendix C to part 835, by revising the table to read as follows: Appendix C to Part 835—Derived Air Concentration
(DAC)for Workers From External Exposure During Immersion in a Cloud of Airborne Radioactive Material Air Immersion DAC Radionuclide Half-Life (µCi/mL) (Bq/m 3 ) Ar-37 35.02 d 3E+00 1E+11 Ar-39 269 yr 1E-03 5E+07 Ar-41 1.827 h 3E-06 1E+05 Kr-74 11.5 min 3E-06 1E+05 Kr-76 14.8 h 1E-05 3E+05 Kr-77 74.7 h 4E-06 1E+05 Kr-79 35.04 h 1E-05 6E+05 Kr-81 2.1E+05 yr 7E-04 2E+07 Kr-83m 1.83 h 7E-02 2E+09 Kr-85 10.72 yr 7E-04 2E+07 Kr-85m 4.48 h 2E-05 1E+06 Kr-87 76.3 min 4E-06 1E+05 Kr-88 2.84 h 1E-06 7E+04 Xe-120 40.0 min 1E-05 4E+05 Xe-121 40.1 min 2E-06 8E+04 Xe-122 20.1 h 8E-05 3E+06 Xe-123 2.14 h 6E-06 2E+05 Xe-125 16.8 h 1E-05 6E+05 Xe-127 36.406 d 1E-05 6E+05 Xe-129m 8.89 d 2E-04 7E+06 Xe-131m 11.84 d 5E-04 1E+07 Xe-133 5.245 d 1E-04 5E+06 Xe-133m 2.19 d 1E-04 5E+06 Xe-135 9.11 h 1E-05 6E+05 Xe-135m 15.36 min 1E-05 3E+05 Xe-138 14.13 min 3E-06 1E+05 [FR Doc. 2011-1500 Filed 1-24-11; 8:45 am]
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