ML20039F010

LER 81-035/03L-0:on 811204,during Core Spray Valve Test, Breaker for V14-11A Tripped & Reactor Shutdown Commenced. Caused by Breaker Not Latching When Closed,Allowing Breaker to Trip Below Setpoint.Breaker Replaced

ML20039F010
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	12/30/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20039F004	List: ML20039F003 ML20039F010
References
LER-81-035-03L, LER-81-35-3L, NUDOCS 8201110717
Download: ML20039F010 (1)

Text

NRC FORM 366 U.S. NUCLEAR REGULATLRY COMMISSION

, LICENSEE EVENT REPORT LER 81-35/3L o

l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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? 8 9 l V l LICENSEE T l V CODE l Y l S14l 1 l@l 0 l 0 l -lt.lCENSE 15 0 l 0l 0l Ol 0l -l 0l 250l@l4 NUMSER 26 l1LICENSE l1 l1TYPE l 1J0l@l5 7 CAl T 58l@

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? 8 60 61 DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE EVENT DEf.CRIPTION AND PROBABLE CONSEQUENCES h 10121 l During an alternate test on the Core Spray Valve per T. S. 3.5.C.3, the breaker i I o I a l I for V14-11 A tripped. Rx shutdown commenced per T. S. 3.5.C.4. The breaker was re- l 10141 l set and tested satisfactorily at that time. The Core Spray System was declared 1 10151 l operational and Rx shutdown ceased. The potential consequences to the health and i 1016 I l safety of the nublic were min imal . There were no nrevious renorenble occu rrenc e s l 10 l 7 l l of this type. l 10181i  !

7 8 9 80 DE CODE SUSC E COMPONENT CODE SU8 CODE S E

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,_ SEQUENTI AL OCCURRENCE REPORT REVISION LER RO EVENT YE AR REPORT NO. CODE TYPE N O.

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JJ J4 35 3e 31 40 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lt 101 l Af ter further evaluation, the MCC breaker was replaced in order to perform additionall I i I i I [.tgsr in n. The removed breaker was found to be not latchinn when closed. This condi-1 i ,121 l tion allowed the breaker to trip below its set point. The breaker was a @ HFA and g I was replaced with a @ liFB. The valve was successfully retested. l I

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