ML19225C110
| ML19225C110 | |
| Person / Time | |
|---|---|
| Site: | Skagit |
| Issue date: | 06/29/1979 |
| From: | Black R NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| To: | Leed R LEED, R.M. |
| References | |
| 790628, NUDOCS 7907260490 | |
| Download: ML19225C110 (2) | |
Text
{{#Wiki_filter:a "'cg% a UNITED STATES + 'l NUCLEAR REGULATORY COMMISSION /h E" o WASM NG To N. o. C. 20555 N f a / 6 [ / [.) j's e ~ . a {- June 28, 1979 j. .y gg P(jgCfc gC w L--- .-{ i y ~p y Cl3,.,,, p\\ ' Roger M. Leed, Esq. NG n. s 1411 Fourth Avenue If
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~ %2 In the Matter of Puget Sound Power 6 Light Company, et al. (Skagit Nuclear Power Project, Units 1 and 2) Docket Nos. STN 50-522 and STN 50-523
Dear Mr. Leed:
This is in response to your letter to me dated May 30, 1979 in which you request updated accident rates for the E6-A aircraft that operate out of b'hidbey Island Naval Air Station. You stated that you believe that the accident frequency for this aircraft has increased since the NRC Staff did its aircraft accident probability assessment based on this aircraft for the Skagit site and, therefore, the Staff's calculations might have to be modified. The air crash rate used in the Staff's risk assessment (10 per hour) was based on the peace-time crash rate of U.S. combat aircraft. This rate was developed for use in Standard Review Plan Section 3.5.1.6 and was calculated from an analysis of 2136 United States Navy, Marine Corps, and Air Force accidents during the period 1963 to 1973 of which 56 accidents involved the A6 aircraft or variations thereof. Production of the A6 ceased in 1969 and the basic aircraft has been converted since that time. One of these con-versions is the E6-A which you have referred to in your letter. At this time, the Staff does not believe that a reassessment of the aircraft hazard risk at Skagit is warranted for the following reasons: 1) The crash rate utilized in the Staff's assessment (10 crashes per hour) is conservative because the actual-5 peace time crash rate of combat aircraft is about 10 per hour. See Affidavit of Jacques B. J. Read on Military Aviation, dated July 16, 1976, p.8. 2) The A6 accident experience represents about 2.6 percent of the total accident data base and includes accidents which are not considered relevant to the Skagit site, e.g., carrier launch-and-recovery accidents. Therefore, even if it can be shown that the A6 or E6-A accident rate has increased in recent years and that the accidents have A 413 219 -=J 700 260 f/O
relevance to the_Skagit site, it would have a very miniaal impact on the 10 accident rate used in the assessment. 3) Finally, because all A6 airframes are between 10 and 20 years old, the Staff expects that before the Skagit facilities are proposed to become operational in the mid-to-late 1980's, the A6 will likely be replaced by newer aircraft models in the Pacific fleet. You also requested information concerning the NRC Staf f Practice and Procedure Digest (NUREG-0386). It is available from the National Technical Information Service, Springfield, Virginia 22161 at $6.50 per copy. In addition, pur-suant to your request, enclosed is a copy of Planning Basis for the Develop-mant of State and Local Government Radiological Emergency Response Plen: in Support of Light Water Reactor Plants (NUREC-0396). Finally, we have advised our distribution services to put you on a mailing list for newly published NUREGs. Sincerely, Richard L. Black Counsel for NRC Staff
Enclosure:
As stated cc w/o enclosure: Service List 413 220}}