05000271/LER-1982-010

LER 82-010/03L-0:on 820513 & 27,RHR Svc Water Breaker Tripped Free When Pump Started.Caused by Worn Prop.Ge Model 416 250-8HB Breaker Prop Replaced.Breaker Tested Satisfactorily & Returned to Svc

ML20054G917
Person / Time
Site:	Vermont Yankee
Issue date:	06/11/1982
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054G910	List: 05000271/LER-1982-010, Forwards LER 82-010/03L-0
References
LER-82-010-03L, LER-82-10-3L, NUDOCS 8206220408
Download: ML20054G917 (2)

LER-2082-010,

Event date:
Report date:
2712082010R00 - NRC Website

text

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LICENSEE EVENT REPORT LER 82-10/3L CONTROL BLOCK: l l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI I C lc l td l9 l VlT 1

lV lY ls l1 l@l 0 l 0 l - lL: 0 LICENSEE CODE 14 15 l 0 l 0 l 0 lo l- l0 lol@l4l1l1l1l1l@l CENSE NUMBEH 25 26 LICENSE TYPE J0 l

57 CAT 68 l@

CON'T l0l11 $RNlL60 hl 0l 510 l DOCK 01012 l 711 @l 68 0 69I5 11EVENTI3 DATE lR l2 l@l 0 l 6 lREPORT 74 75 1 l 1DATE 18 l 280l@

I 4 61 ET NUYS ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l

10121 l I

[ o 13 I l SEE ATTACilED PAGE. l lg g l I

10151 I l

Ir l61 I 10171I I I

I o 14 ] I 80 7 ~89 S4 STEM CAUSE CAUSE COY P. VALVE CODE CODE SUBCODE COYPONENT CODE SUBCOOE SUSCODE lOl91 1 8 9 l Cl Fl@ {@ l Al@ l C l K l T lB lR ]K l@ W@ l Z l@

10 11 12 13 18 19 20 SEQUENTi AL OCCURRENCE REPORT R EVISION LER AO EVENT YEAR REPORT NO. CODE TYPE NO.

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J l Ol 1l 0l 24 26 l/l 27 l0 l3 l 28 29 lLl JO l-l 31 W

32 TA E ACTC' ON PL A' T ET HOURS SB IT F R B. SUPPLIE MAN FACTURER lCl@l2]@ W@

JJ J4 35 l36Zl@ 3 l0l0l0l0l 40 W@ l yl@ lA l@

41 42 43 l44G l 0 l 8 l 047l@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i j o l l Af ter the trip on 5/13, the breaker was checked and a washer was found jamming an l gil3 j l auxiliary relay in the breaker. The washer was removed and the brenker tested satis- l

,,;,, factorily. After the trip on 5/27, the breaker was removed from service. A worn " Prop"l

, , , , l wa s found to be causing the breaker to trip. The old prop was replaced, breaker was l

,,,,,g tested satisfactorily and returned to service. The breaker is a GE model 416 250-8HB. l 7 s 9 80 ST S , POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION liISI d h 11 l0 10 lh! NA l Whl Orierator Observation l ACTiviiv CONTENT RELEASED OF RELE ASE AMCUNT OF ACTIVITY LOCATION OF RELEASE Ii Ic l LzJ @ lz l@l x^ - 1 I NA l 7 8 _1 10 tt 44 45 80 PE R5CNNEL F kPOSURES Nuve E R TYPE DESCF i' TION NA l li l 71101 o f 01@l z l@l ,

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,ERsONNe'L ,N;u' RIES w.m R oESCR,PTiON@

NA l li l- Is I90 l 0101@l

. 1, ,2 80 LOSS OF CH D AVAGE TO F ACILITY n PE C E SC RIPTION NA I I i I o* I9l.z J@lm *

'* 8206220408 820611 NE USE OU

!ss dNEsCn PTiONE $DR ADOCK 05000271 PDR lllllllllllll1 l .' I o l l N @l l 63 69 30 ;

7 8 9 10 NAYE OF PREPARER " "

VTVYS1 05000271 LER 82-10/3L EVENT DESCRIPTION AND PROBABLE CONSEQUENCES on 5/13/82, the A RHRSW breaker tripped free when the pump was started.

Alternate testing began per T. S. 4.5.C.2. The breaker was replaced with a spare and tested satisfactorily. On 5/17/82, normal' breaker was reinstal-led and tested satisfactorily. On 5/27/82, the breaker again tripped free on pump start. Alternate testing began per T. S. 4.5.C.2. A spare breaker was installed and tested satisfactorily. Due to the availability of redundant equipment, there were no consequences to the health and safety of the public.

Previous events were reported as LER 81-37/3L and 81-15/3L.

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