ML19340B269

Updated LER 80-030/03L-1:on 800813,normal Surveillance Testing of RHR Motor Operated Valves RHR-MO-34B,revealed RHR B Loop Suppression Pool Cooling Inboard Throttle Valve Inoperative,Due to Key Failure Between Motor Gear & Shaft

ML19340B269
Person / Time
Site:	Cooper
Issue date:	10/03/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340B261	List: ML19340B260 ML19340B269
References
LER-80-030-03L, LER-80-30-3L, NUDOCS 8010210717
Download: ML19340B269 (1)

Text

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REPORT OATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h to12l lDuring normal surveillance testing of RHR motor operated valves, RHR-M0-34B, the RH5 loj y l"B" Loop suppression pool cooling inboard throttle valve would not operate. This isl 1 o 1. l la repetitive occurrence (ref. LER 76-14 and 77-11). The "A" RHR Loop was operable a$

I o I s 1 lwell as both diesel generators. The upstream valve was operable so that the "B" Loot I o 16 I lcould be used for LPCI injection and for containment isolation purposes. RHR-M0-34}

JO17ll failed in the normally closed position. There were no adverse affects to the publicl l0#Rl l health and safety. (RTS 3.5.B)  !

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JJ 34 36 31 40 41 42 43 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l ooerator for subiect valve is Limitoroue SMB-4. Event due to key failure between mot li I t i Itor pinion sear & shaft. Motor & key were replaced. Analytis of key by Limitoraue I 1i121Iindicated key material incorrect. For SME-3,4,65's a 4140 carbon steel key hardened l tii3Ilto 280/320 Brinell should be used. Machinerv history was checked on other such opert-U_j,1,.] Istors & no other keys are susnect. Limitoraue Main. Proc. has been written to warn.1 7 8 9 80 STA S  % POWER OTHER STATUS ISCO RY OISCOVERv DESCRIPTION W [yj@ l Q 9 6 l@l NA l lBl@l Operator Observation l A flVITY CC TENT RELEASED OF RELE ASE AMOUNT OF ACTivlTV LOCATION OF RELEASE Ii I6 i L2] @ [;;.J@l NA l l 45 NA l 3 a 1 to 13 44 80 PERSONNEL FXPOSURES NUP/H E R TYPE DESCRi? TION I' > I 'il 1' 01 of ol@Lz_J@l n I P ERSON.d',mu'4Es "

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