05000298/LER-1979-035-03, /03L-0:on 791109,during Core Spray Operability Surveillance procedure,CS-MO-12A Valve Would Not Open Electrically.Caused by Failure of Axial Movement on Worm Set Clutch Collar.Valve Repaired

/03L-0:on 791109,during Core Spray Operability Surveillance procedure,CS-MO-12A Valve Would Not Open Electrically.Caused by Failure of Axial Movement on Worm Set Clutch Collar.Valve Repaired

ML19256G568
Person / Time
Site:	Cooper
Issue date:	12/07/1979
From:	Flannigan R NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19256G559	List: 05000298/LER-1979-035, Forwards LER 79-035/03L-0 05000298/LER-1979-035-03, /03L-0:on 791109,during Core Spray Operability Surveillance procedure,CS-MO-12A Valve Would Not Open Electrically.Caused by Failure of Axial Movement on Worm Set Clutch Collar.Valve Repaired
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912310467
Download: ML19256G568 (1)

LER-1979-035, /03L-0:on 791109,during Core Spray Operability Surveillance procedure,CS-MO-12A Valve Would Not Open Electrically.Caused by Failure of Axial Movement on Worm Set Clutch Collar.Valve Repaired

Event date:
Report date:
2981979035R03 - NRC Website

text

N RC.F oRM 366 U. S. NUCLEAR REGULATORY COMMISSloN (7 17)

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'80 EVENT DESCRIPTION AND PROBABLE CONSECUENCES In lDuring the performance or a CS opera ility surveillance procedure (S.P. 6.3.4.2) it I 0

2 gwas discovered that CS-MO-12A would not open electrically. At the time of the oc-1 a

3 lcurrence the redundant valve, CS-MO-llA, was closed. CS-MO-12A was manually opened j o

a land tagged in the open position. The CS system remained available and operable as I

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JJ J4 Ob J6 31 40 43 42 4J 44 47 cAUSE CESCRIPTION AND CORRECTIVE ACTIONS I 1 lThe cause of the failure was axial movement of the worm set clutch collar on the I

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