ML19350E868

LER 81-015/03L-0:on 810528,air Circuit Breaker for Pump P-8-1B Tripped Free When Closed,Preventing Performance of LPCI Sys Logic Test.Caused by Worn Bushings on Operating Mechanism.Circuit Breaker Replaced & Tested

ML19350E868
Person / Time
Site:	Vermont Yankee
Issue date:	06/16/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19350E866	List: ML19350E865 ML19350E868
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8106230603
Download: ML19350E868 (1)

Text

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l Nitc pones aos ~ u. s. NUCLEAR REIULATdGY COAAMISSION

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-p LICENSEE EVENT REPORT - LER 81-15/3L O co 1 o' 'oc e i, i i i i i p < TEA .Nr o 1, A Eoe fo NPe MA11e >

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-7 8 60 61 DOCX E T NUMgER 68 ' 69 EVENT DATE 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121. l The ACB's for RHRSW Pumps P-8-1B&D must be rocked down in order to conduct the l ITTT'l I 'B' LPCI System Logic Test. Contrary to T.S. 3.5.C.2. the ACB for Pump P-8-1B l 10 l A i l would trip free when closed. All other components of the RHRSW were determined to l 10 i s 1 l be operable. The circuit breaker was replaced and the testing satisfactorily com- l 10teiI pleted'. Based on the above. there were no adverse consecuences to the public healthi l C I 7 I l and safe ty. No nrevious similar occurrences have been reDorted to the Commission. l 10181I l

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3a 36 37 40 41 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l This event was caused by worn bushings on the operating mechanism causing the l g l breaker to trip free upon closure. The breaker was manufactured by General Electrici

, l Model AM 4.16 250-8HB. The corrective action was to replace the circuit-breaker l g l and demonstrate satiefactory operation of the RHRSW pump. l I

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NAMEC PARER PHONE: (802) 257-7711  ?

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