ML19256G568

LER 79-035/03L-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

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: ML19256G558 ML19256G568
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912310467
Download: ML19256G568 (1)

Text

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

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATioN)

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1 3 3 L6CENSEE EODE 34 '5 LICENSE NuvdEH 25 26 LICENSE TYPE J0 CON'T ScSE ILI@l0!5I0l0l0l2l9l8l@l1 Il lolol7lo h 1 o l nl -l , o@ '80 6 60 61 DOCKET NUYBER 68 69 EVENT DATE 74 75 AEPORT C ATE EVENT DESCRIPTION AND PROBABLE CONSECUENCES In 0 2 lDuring the performance or a CS opera ility surveillance procedure (S.P. 6.3.4.2) it I a 3 gwas discovered that CS-MO-12A would not open electrically. At the time of the oc- 1 o a lcurrence the redundant valve, CS-MO-llA, was closed. CS-MO-12A was manually opened j

[o s land tagged in the open position. The CS system remained available and operable as I a is lwas the redundant system. There vere no advpese affects to rho nnblic bpilth and 1 0 17 Isafety. The even* is renp*4rino. (Ref. TUR 7 o -(17 c cn c n en i n g FGVO-11 A T  !

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JJ J4 Ob J6 31 40 43 42 cAUSE CESCRIPTION AND CORRECTIVE ACTIONS I 1 lThe cause of the failure was axial movement of the worm set clutch collar on the I i i lLimitorque SMB-2 operator. The valve was repaired and the damaged parts replaced I

, lwith identical parts. The valve was tested satisfactorily. No further action is [

, planned. I l 14 1 1 4 9 80 ST i POWER OTHER S T A TUS DISCO RY DISCOVERY DESCRIPTION i c l E l@ l0 l 9 l 6 l@l NA l lBl@l Operator Observation l ACTIV8 TY CO TENT RELEASED OF RELE ASE AYOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 [ Z_] @ [Z_j@ NA l l NA l ct 9 10 iT 44 45 80 PERSONNEL EXPOSL AES a vetE R TYPE C E SC A t P TION i 7 l0 0 l 0 l@l Zl@l NA l PE SON. J' ~u'A ES Nu men DEScaiPT ON s

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a 3 ft. M 69 80 1 Richard D. Flannigan 402-825-3811 0 1

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