05000298/LER-1980-002-03, /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

/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: 05000298/LER-1980-002, Forwards LER 80-002/03L-0 05000298/LER-1980-002-03, /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
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002280430
Download: ML19294B459 (1)

LER-1980-002, /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

Event date:
Report date:
2981980002R03 - NRC Website

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NRC FORM 366 U S. NUCLE AR REGULATOR' COMMISSloN sm UCENSEE EVENT REPORT

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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 the operator, the HPCI would have cerformed its intended safety function if recuired!.

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The stem for a 10" inverted n41 n n n'-n e na c en, o

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

l reassembled and HPCI operability was verified (S.P. 6. 3.3.!4).

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