ML19338C792

LER 80-030/03L-0:on 800813,during Normal Surveillance Testing of RHR Motor Operated Valves,Rhr Loop B Suppression Pool Cooling Inboard Throttle Valve Would Not Operate.Caused by Failure of Key Between Motor Pinion Gear & Motor Shaft

ML19338C792
Person / Time
Site:	Cooper
Issue date:	08/21/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338C788	List: ML19338C787 ML19338C792
References
LER-80-030-03L, LER-80-30-3L, NUDOCS 8009050289
Download: ML19338C792 (1)

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7 8 61 DOCK ET NUM8ER 68 DATE 14 75 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h f'oTil During normal surveillance testing of RHR motor onerated valves. RMR-MO-34B. tha RMRl l o 131 l'B" Loop suppression cool cooline inboard threrele un1va unn1A nne nnavnea- Thf= 4e i 10141 h repetitive occurrence (ref. T FR 76-14 nna 77-11). The "A" Run Tnnn une nno,2klo nel 10151 kell as both diesel genornenr=_ Tha unarraim univa use nnernblo en

• hoe *bo "u" T_eg7 I iaisi pould be used for LPCI injection and for containment isolation purposes. RHR-M0-34B1 10l71 failed in the normally closed position. There were no adverse affects to the public l l o is I health and safety. (RTS 3.5.B) l 7 8 9 do SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUSCODE COMPONENT CODE SU8 CODE SUSCODE I O 1 il 8

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44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h 1 i l o ] The operator for the subiect valve is a Limitoroue SMB-4. The failure was caused be-l 1iiil bause the key between the motor einion near and the motor ahnfe fn41aa Th. mnen. I iil j pnd key were replaced. The key has been returned to Limitorque for analysis. This isI m kn interim report, an updated report will be issued when this analysis is complete, I LL,L4,,,,) I I r s 'I 80 ST S '. POWE R OTHER STA TUS ISCO R DISCOVERY DESCRIPTION i' > 1's 'i Lt.J@ l n i o I ^"181" m I Laj@l nna v e n,- nh a v, 4 n., I

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