ML20009B988

LER 81-005/03L-0:on 810625,during Normal Operation, Contractor Accidently Tripped Turbine Overspeed Trip Valve on Auxiliary Feedwater Pump.Valve Reset.Contractors Removed from Area & Reminded to Use Caution

ML20009B988
Person / Time
Site:	Point Beach
Issue date:	07/10/1981
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009B986	List: ML20009B985 ML20009B988
References
LER-81-005-03L-01, LER-81-5-3L-1, NUDOCS 8107200121
Download: ML20009B988 (2)

Text

NRC FORM 3s6 U. S. NUCLE AR REGULATORY COMMISSION (7-7 7)

LICENSEE EVENT REPORT 1 CONTROL BLOCCt: [ l i

l l l l elh (PLE ASE PQlNT OR TYPE ALL REQUIRED INFORMATI@N) o 1 7 8 l9 W lLICENSEE I l P CODE l B l H l 2 l@Ib0 l0 l-LICENSE le l 0 NUMBER l0 l0 l0 l0 l -l 260 l 026 ]@l 4 l TYPE LICENSE 1l 1l JO 1l $7 1l@ll CAT $8 l@

COWT lOl1l S$n"CE l L 61l@l 015DOCKET l0 l NUMBER 0 l 01310 68l1 l@l 0 EVENT l6 l 2DATE l 5l 8l 1l@l0 l 7REPORT l1 l DATE 018 l 180l@

7 0 60 69 74 75 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 1012 l l At about 0 813 hours0.00941 days <br />0.226 hours <br />0.00134 weeks <br />3.093465e-4 months <br /> , on 6-25-81, during normal plant operation, a con- 1 l 0 l a l l tractor accidentally tripped the turbine overspeed trip valve on an l o 4 l auxiliary feed pump. At the time of the trip, the 3D Diesel generator l 101 s 1 l was out-of-service , meaning one auxiliary feed pump would not operate inl IO ls l I an accident condition coincident with loss of AC. The valve was reset l l o l 7 l l a few minutes later. The trip resulted in a degraded mode of operation l lo gg g g permitted by Technical Specifications. No similar events. l i d 8 9 80 SYSTEM CAUSE CFJSE COMP. VALVE CODE CODE SUeCODE COMPONENT CODE SU8 CODE SUBCODE O 9 l H l B l@ W@ W @ l V l A l L l V l E l X l@ y@ [D_J @

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_ SEQUENTIAL OCCURRENCE REPORT REVISION LER RO EVEkT YEAR REPORT NO. CODE TYPE N O.

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44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l 0 l l A contractor accidentally depressed the mechanical trip mechansim on thel i i l valve, causing the auxiliary feed pump to be temporarily inoperable. I

, 2 I The valve was reset a few minutes after the trip occurred. All con- l

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lgi3l l tractors were removed from the area and were reminded to use caution 1 3 4 l when working around safety-related equipment. I 7 8 9 80 ST S  % POWER OTHER STATUS 015 O R DISCOVERY DESCRIPTION W W@ l ll 0 l 0 l@l N/A l [_A_j@l Ope ra to r/ con t ra c to r ob s e rva t ion l A TIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE t 6 W @ W@l N/A l lN/A l 7 8 9 10 11 44 45 80 PEHaONNEL EXPOSURES NUMBER TYPE DESCRIPTION 1 7 l 0 l 0 l 0 l@W@l N/A i 80 l

PERSONNE L INJURIES NUMBER DESCRIPTION i a l 0 l 0 l 0 l@l12 N/A l 7 8 9 11 LOSS OF OR DAMAGE TO F ACILITY I TYPE DESCRIPTION

( 1 9 d@l N/A l 80 PUBLt TY 8107200121 810710 NRC USE ONLY ISSUE D oESCRIPTION h PDR ADOCK 05000301 ,

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ATTACHMENT TO LICENSEE EVENT REPORT NO. 81-005/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 2 Docket No. 50-301 At about 0 813 hours0.00941 days <br />0.226 hours <br />0.00134 weeks <br />3.093465e-4 months <br /> on June 25, 19 81, during normal plant operation, a contractor on site for TMI backfitting work inadvertently tripped valve no. 2 TV-20 82 , the turbine overspeed trip valve on auxiliary feed pump 2P29, when he accidentally depressed the valve's mechanical trip mechanism.

The contractor immediately notified plant mechanic electricians in the area, who subsequently reset the valve a few minutes after the trip had occurred. The Duty Shift Supervisor, who had received a valve trip indication in the control room at 0816 hours0.00944 days <br />0.227 hours <br />0.00135 weeks <br />3.10488e-4 months <br />, went to inves tigate the trip and got to the pump as the valve was being reset.

At the time of the trip, the 3D emergency Diesel generator was out of service for an annual overhaul permitted by Technical Specifications. This meant the motor-driven auxiliary feed pump powered by the Diesel would not be operable l in an accident condition coincident with loss of AC. The re fore ,

i the valve trip resulted in one of the three operable auxiliary feed pumps being inoperable for less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, a degraded mode of operation permitted by Technical Specification 15.3.4.C.l. The event is reportable under Technical Specification 15.6.9.2.B.2.

As a result of the event, all contractor personnel l

l were removed from the area and were not allowed to return i until a later date. Contractors were reminded to use caution l when working around safety-related equipment.

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