ML19323B676
| ML19323B676 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 04/25/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Arnold D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| References | |
| NUDOCS 8005140060 | |
| Download: ML19323B676 (3) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION y
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APRIL
- 2. 5 1999 j
Docket No. 50-331 Mr. Duane Arnold, President Iowa Electric Light & Power Comany P. O. Box 35l Cedar Rap, ids, Iowa 52406
Dear Mr. Arnold:
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 temperatures associated with various postulated DC power supply failure (ECCS egipment availability) cases to the peak cladding te@eratures for a HPCI (small break) failure and LPCI injection valve (large break) failure cases. Since the study was based on plant design information which may have been incomplete or out-of-date, some uncer-tainty exists whether the worse ECCS system availability combinations have been identified for your operating BWRs.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 com-binations assumed in the generic analycis are conservative for Duane Arnold Energy Center, we request that you confirm the conclusion of the reference study regarding the minicum 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 (l) recirculation 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.
o Mr. Duane Arnold APRi!. 2 5 1990 This request for generic information was. approved by GA0 under clearance number B-180225(579018); this clearance expires October 31, 1980.
Sincerely, Th
. Ippolito, Chief ~
Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
General Electric Company letter (R.E.Engel)toUSNRC(P.S.
Check), "DC Power Source Failurt for BWR/3 and 4," dated November 1, 1978.
cc w/ enclosure:
See next page m
APRIL 2 5 1980 Mr. Quane Arnold 3-Iowa Electric Light & Power Company cc:
Mr. Robert Lowenstein, Esquire Harold F. Reis Esquire Lowenstei', Newman, Reis and Axelrad n
1025 Connecticut Avenue, N. W.
Washington, D. C.
20036 Cedar Rapids Public Library 426 Third Avenue, S. E.
^
Cedar Rapids, Iowa 52401 t
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