ML20245B680

Forwards AEOD Technical Rept Re Mispositioning of Reverse Acting Valve Controllers

ML20245B680
Person / Time
Site:	Susquehanna
Issue date:	12/03/1987
From:	Stewart J NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
To:	Rosenthal J NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
Shared Package
ML20245B685	List: ML20245B680 ML20245B842
References
NUDOCS 8904260219
Download: ML20245B680 (1)

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UNITED STATES i 8 k NUCLEAR REGULATORY COMMISSION  !

7. ;E WASHINGTON, D. C. 20555

'+4 r December 3,1987 MEMORANDUM FOR: Jack E. Rosenthal, Chief Reactor Operations Analysis Branch Division of Safety Programs, AE0D THRU: George F. Lanik, Chief Reactor Systems Section GE and CE Reactor Operations Analysis Branch Division of Safety Programs, AEOD  !

FROM: Joseph P. Stewart, Reactor Systems Engineer Reactor Systems Section GE and CE Reactor Operations Analysis Branch Division of Safety Programs, AE0D

SUBJECT:

MISPOSITIONING OF " REVERSE ACTING" VALVE CONTROLLERS I

A copy of the subject AE0D technical review report is enclosed. This study was initiated in response to an event at Susquehanna Unit 2 which involved controllers of service water regulating valves for room coolers. The investigation of this event of mispositioning of the " REVERSE ACTING" valve controllers found:

I. If a loss-of-coolant-accident occurred while the valve controllers were

, mispositioned, and the accident made the controllers inaccessible, then the LPCI and core spray system could become inoperable because of overheated switchgear.

2. The licensee's corrective actions were adequate and appropriate.

A data search for similar events of mispositioning of " REVERSE ACTING" controllers causing both trains of safety systems to become inoperable during postulated accidents was negative. Therefore, this report finalizes and concludes the investigation of the event, n

Joseph P. Stewart, Reactor Systems Engineer Reactor Systems Section GE and CE Reactor Operations Analysis Branch Division of Safety Programs, AE0D fnclosures: As stated cc w/ enclosure: //

L. Gifford, GE R. Borsum, B&W

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C. Brinkman, CE I.

M. Beaumont, W POQ,._.

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