ML19253C328

LER 79-024/03L-0:on 791025,vacuum Breaker AO 2-1601-20B Failed to Open During Calibr & Functional Test.Caused by Component Failure.Solenoid Valve 2-1601-50B Rebuilt 791025

ML19253C328
Person / Time
Site:	Quad Cities
Issue date:	11/14/1979
From:	Wykoff D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19253C323	List: ML19253C322 ML19253C328
References
LER-79-024-03L-03, LER-79-24-3L-3, NUDOCS 7911300525
Download: ML19253C328 (1)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h s o 2 l While performing procedure QlS 48-1, Pressure Suppression Chamber and Reactor [

o 3 l Cuilding Vacuum Breaker Actuation Calibration and Functional Test, vacuum breaker l o 4 l A0 2-1601-20B failed to open (TS 3 7.A.3.a). Primary containment integrity was o s I maintained as valve A0 2-1601-20B failed closed, and the vacuum breaker function of l o e l the system was maintained by the 100 percent flow path through redundant valve l 0 7 l A0 2-1601-20A. Check valves 1601-31A f, B were operable. i 0 8 l l 7 8 9 80 SYSTE M CAUSE CAUSE COMP. VA LV E CODE CODE SueCODE CCVPONENT CODE SUSCODE 3USCOCE

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40 42 43 44 CAUSE DESCRIPTION AND CORRECTlvE ACTIONS h i o l The cause of this occurrence was component failure. THe solenoid valve, 2-1601-50B, I m that controls the air supply to the pneumatic operator of valve A0 2-1601-20B I

, 2 l failed to operate. Excessive wear of the solenoid allowed the plunger to bind. I gl The 2-1601-50B solenoid valve was rebuilt on October 25, 1979 and valve A0 2-1601-20B l i 4 [

was proven operable. l 7 8 9 80 STA S  % POWER OTHER STATUS bl5 RY DISCOVERY DESCRIPTION i s l E l@ l 0l 4 l 9 l@l NA l Routine Test l B l@l ACTIVITY CO TENT RELEASED OF RELE ASE AYOUNT OF ACTIVITY LOCATION OF RELE ASE 7

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