ML19323B643
| ML19323B643 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 04/25/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Berry G POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| References | |
| NUDOCS 8005140014 | |
| Download: ML19323B643 (3) | |
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UNITED STATES y
g NUCLEAR REGULATORY COMMISSION r
wAsmucToN.o, c. 20sss APRll ! 5 1980 Docket No 50-333 Mr. George T. Berry General Manager and Chief Engineer Power Authority of the State of New York 10 Columbus Circle New York, New York 10019
Dear Mr. Berry:
SUBJECT:
EFFECT OF A DC POWER SUPPLY FAILURE ON ECCS PERFORMANCE It has generally been recognized that the loss of a direct current (DC) power supply could disable several emergency core cooling system components and thereby could result in a limiting single failure condition for some breaks. The enclosed letter report was submitted to the NRC staff by the General Electric Cogany to provide a definitive, generic, reference analysis of the effects of DC power supply failures on ECCS conformance calculations. The NRC staff is reviewing the analysis which compares the peak cladding tegeratures associated with various postulated DC power supply failure (ECCS egipment availability) cases to the peak cladding temperatures for a HiCI (small break) failure and LPCI injection valve (large break) failure cases. Since the study was based on plant design information which may have been incoglete or nut-of-date, some uncer-tainty exists whether the worse ECCS system availability combinations have been identified for your operating BWRs. Accordingly, in order that we may have an adequate level of assurance that the systems corre-binations assumed in the generic analysis are conservative for FitzPatrick Nuclear Power Plant, we request that you confirm the conclusion of the reference study regarding the mininum ECCS equipment availability with a DC power supply failure. Include in your response a list of the ECCS equipment that would be available for large and small (1) recircula-tion loop discharge breaks, and (2) recirculation loop suction breaks.
The listing of equipment available should take into account not only DC power supply failure, but also loss of equipment due to water spillage.
Please provide a schedule for your response within 30 days of the receipt of this letter.
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Mr. George T. Berry 2-APRIL 2 51!B0 This request for generic information was approved by GA0 under clearance number B-180225(579018); this clearance expires October 31, 1980.
Sincerely.
s_
Thoma to, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
General Electric Conpany letter (R. E. Engel) to USNRC (P. S.
Check), "DC Power Source Failure for BW/3 and 4," dated November 1, 1978.
cc w/ enclosure:
See next page ed S
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Mr. George T. Berry 3-APRIL 2 5 1980 Power Authority of the State of New York cc:
Mr. Charles M. Pratt Assistant General Cotnsel Power Authority of the State of New York 10 Colimbus Circle New York, New York 10019 Mr. Peter W. Lyon Manager - Nuclear Operations Power Au'hority of the State of New York 10 Coltm6us Circle New York, New York 10019 Mr. J. D. Leonard, Jr.
Resident Manager James A. FitzPatrick Nuclear Power Plant P. O. Box 41 Lycc:afng, New York 13093 Director, Technical Development Prograns State of New York Energy Office Agency Sailding 2 Empire State Plaza Albany, New York 12223 State University College at Csweco Penfield Library - Dccuments Oswego, %ew York 13126 George M. Wilverding, Licensing Superrisor Power Au:hority of the State of New Y:rk 10 Coltmous Circle New York, New York 10019 l
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