ML20062H977

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Responds to Re Encl G Trust Concerns About Health Effects of 790328 Accident & Purging Reactor Bldg Atmosphere.Several of Trust Concerns Result from Misunderstanding & Misapplication of Info
ML20062H977
Person / Time
Site: Crane 
Issue date: 08/21/1980
From: Dircks W
NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
To: Goodling B
HOUSE OF REP.
References
NUDOCS 8009110501
Download: ML20062H977 (9)


Text

{{#Wiki_filter:i gM%q ,,p _ k UNITED STATES NRC PUBUC 3e g NUCLEAR REGULATORY COMMISSION { E WASHINGTON, D. C. 20555 g n g ,/ OClWENT ROOM 4.... Dockct No. 50-320 AUG 211980 The honorable Bill Goodling United States House of Representatives Washington, D. C. 20515

Dear Congressman Goodling:

I am writing in response to your note of June 23, 1980, to the NRC regarding the letter of June 19, 1980, from your constituent, Geraldine Trust. Ms. Trust expressed concern about the health effects of the TMI-2 accident of March 28,1979, and purging the reactor building atmosphere. I am enclosing three documents which address the concerns in Ms. Trust's letter: 1. " Final Environmental Assessment for Decontamination of the Three Mile Island Unit 2 Reactor Building Atmosphere" (NUREG-0662, Vol.1) 2. " Answers to Questions About Removing Krypton from the Three Mile Island, Unit 2 Reactor Building" (NUREG-0673) 3. Huclear Station" (NUREG-0558) pact of the Accident at the Three Mile Island " Population Dose and Health Im Several of Ms. Trust's concerns result from misunderstanding and misapplication of certain information and I have addressed them below. The assumption that venting 57,000 Ci of krypton-35 will result in a whole body 5 mrem dose (and the corresponding extrapolation to a resultant whole body dose from 13,000,000 Ci of noble gases released during the accident) is erroneous. The 5 mrem dose is an annual design objective of Appendix I to 10 CFR Part 50 for maintaining releases of radioactive materials in gaseous effluents from normal operating reactor plants as low as reasonably achievable. The corresponding annual desip objective for beta skin dose is 15 mrem. It is not the expected dose resulting from venting 57,000 Ci of krypton-85. As shown in the staff's Environmental Assessment (Reference 1), the reactor building purge is expected to result in a 0.2 mrem whole body dose and a beta skin. dose of 11 mrem. 4 Krypton-85 is not a neutron emitter but is an emitter of beta radiation. A. good summary of the physical and chemical characteristics of krypton-85 can be found in Section 7 of Reference 1. 4 8009110501 }

The Honorable Bill Goodling Ms. Trust also expresses concern about the health effects resulting from venting the TMI-2 reactor building atmosphere. Section 7 of Reference 1 provides a detailed discussion of anticipated health effects and places the risk of this evolution in perspective. As Section 7 shows, the health risks associated with the purge are negligible. It should be noted that authorization to purge the TMI-2 reactor building was provided by the Commission on June 12, 1980, purging commenced on June 28, and was concluded on July 11. The purge was completed well within the dose design objectives discussed above. I trust that the enclosed information and above connents adequately respond to Ms. Trust's concerns. Sincerely, We61T, A.RehTtf illias J. Dircks, Acting gExecutive Director for Operations q

Enclosures:

1. NUREG-0662, Volune 1, May 1980 L 2. NUREG-0673 3. NUREG-0558 4. Incoming letter dated 6/23/80 ?

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