ML19294B459

LER 80-002/03L-0:on 800103,operator Found Valve Stem on HPCI Stop Valve Broken Separating Valve from Operator.Caused by Valve Stem Being Overstressed During Process of Freeing Stop Valve Piston on 790912.Valve Reassembled

ML19294B459
Person / Time
Site:	Cooper
Issue date:	01/21/1980
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19294B458	List: ML19294B457 ML19294B459
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002280430
Download: ML19294B459 (1)

Text

NRC FORM 366 U S. NUCLE AR REGULATOR' COMMISSloN sm -

UCENSEE EVENT REPORT l  ! l 1 I (PLE ASE PRINT oR T'rPE ALL RECUIRED INFORMATIC"o coNTRotstocx( ]@

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, T. puring normal operation, an operator found the valve stem on the HPCI stop valve l

., ,, broken separating the valve from the operator. The redundant sy. stem, ADS, was oper-t , i .; able as were all low pressure injection systems. Since the valve is pushed open bv 1 i , the operator, the HPCI would have cerformed its intended safety function if recuired!.

' i-- There were no adverse affects to &blic % ,1

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ACTION SUTLnE ESFECT SHuTDOAN ATT ACwY E N T N PR O-4 PR3VE COMP COYPONENT TAKEN AC TION QN PL ANT YETHOD HOURS 2 SUBYlTTED 50HM w8 SLFPUER MANLFACTUAER lAl@lZ @ l Z l@

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o The stem for a 10" inverted n41 n n n'-n e na c en, , 1-o m ,,c,c*nvoA u S A ,,

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, jKoerting Con:pany was overstressed while freeing the stuck valve piston. A new stem I

, , yas installed and the valve internals were cleaned and inspected. The valve was l

, 3 l reassembled and HPCI operability was verified (S.P. 6. 3.3.!4) . I I 4j l l 7 8 i 90 F ACILITy , UE T**00 0F STAfus .POWE9 OTHER ST ATUS DiSCOV E R Y DISCOk ERY CESCR'PTION I '" [f_j@ l0l9l6l@ 10 NA 44 I lAl@l Observed by Ooerator on Tour 80 l

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