ML20023B832

LER 81-053/03L-1:on 811120,discovered That Single Failure of Electrical Power Supply Could Either Isolate Both Condenser Sys or Cause Failure to Isolate.Logic for Initiation & Isolation of Condenser Sys Reviewed

ML20023B832
Person / Time
Site:	Nine Mile Point
Issue date:	04/18/1983
From:	Randall R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20023B831	List: ML20023B830 ML20023B832
References
LER-81-053-03L, LER-81-53-3L, NUDOCS 8305060428
Download: ML20023B832 (1)

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! i 8 G1 F4 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I O I 21 l While performing a design review encompassine the problem renorted on LER 81-53.

. I O 3 l Rev. O, and Appendix k criteria, it was discovered that a single failure of an l l0 l4 l [ electrical power supply could, in one case, isolate both emernency condenser systems.1 lO lsl l and in another case, cause a failure to isolate. Since the reactor was defueled for i O c I a major maintenance outage and the safety system was not challenced. safety conse- I gl quences were minimal. I 1018l 1 I F 8 9 80 SYSTEM CAUSE CAUSE COMP, VALVE CODE CODE SUSCODE COMPONENT CODE SU8 CODE SUSCODE 7

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