ML19305E489
| ML19305E489 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 04/11/1980 |
| From: | Ballard R Office of Nuclear Reactor Regulation |
| To: | Broshean J AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 8005120531 | |
| Download: ML19305E489 (3) | |
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C WASHINGTON, D. C. 20555 o, % nut /y8 APR '.1 EGO Docket ilos. 50-275 and 50-323 Mr. James fl. Broshean 301 Utah Street Oceano, California 93445
Dear fir. Broshean:
Your letter of July 30, 1979, to Mr. Harold Denton regarding the Diablo Canyon fluclear Generating Station has been referred to me for reply.
Please accept our apologies for the extensive delay in responding to your letter.
This delay was caused in part by several staff project management reassignments for the Diablo Canyon case.
With respect to your concerns of earthquake risks at the Diablo Canyon site, the flRC has conducted an exhaustive analysis on this matter. This analysis included consideration of geologic structure, geologic history and earthquake history in the area of the proposed Diablo Canyon site. The seismic issues including earthquake risk at Diablo Canyon were presented before the Atomic Safety and Licensing Board (ASLB) which held extensive hearings on this matter from December 1978 through September 1979.
The final comments and conclusions of the ASLB were as follows:
"The Staff review of the seismic design of the Diablo Canyon plant was the most extensive ever undertaken by the Staff of the f1RC.
(Knight Testimony at 54). The Applicant's review was also extraordinarily thorough.
"The Board finds that the Applicant has demonstrated through appropriate analysis and tests that Category I structure, systems, and components will perform as required during the seismic load of the safe shutdown earthquake.
"The Board finds that the Category I structures, systems and compnents will be adequate to assure (a) the int grity of the reactor coolant oressure boundary, and (b) the capability to shut down the reactor and maintain it in a safe condition.
"The Board finds that the evidence demonstrates that all structures, systems, and components of the Diablo plant necessary for continued operation without undue risk to the health and safety of the public will remain functional and within applicable stress and deformation limits when subjected to the effects of the operating basis earthquake in combination with normal operating loads.
THIS DOCUMENT CONTAINS POOR QUALITY PAGES
e.
Mr. James N. Broshean APR 11 Egg "The Board finds that the necessary safety functions will be maintained during the safe shutdown earthquake where, in the safety-related structures, systems and components, the design for strain limits is i.. excess of the yield strain."
If you are interested in further details of.he treatment of seismic issues, I refer you to Supplement No. 7 to the Safety Evaluation Report for the Diablo Canyon Nuclear Power Station, issued by the NRC in May of 1978, and to the transcripts of the ASLB hearings. Thes. documents are available in the Documents and Maps Department of the California Polytechnic State University Library, San Luis Obispo, California.
As to the releases of low level radioactive emissions from operating nuclear power plants, both the U.S. Nuclear Regulatory Ccommission and the U. S.
Environmental Protection Agency have established regulations to limit such releases to levels that would not produce any known health or safety risks to either the plant operating staff or the general public.
1 We thank you for your interest regarding these mutters and trust we have appropriately addressed your concerns.
Sincerely,
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d le Ronald L. Ballard, Chief Environmental Projects Branch 1 Division of Site Safety and Environmental Analysis i
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