ML19312A204

LER 79-005/03X-1 on 790216:reactor Recirculation Motor Generator Set a Tripped During Normal Operation.Caused by Failure of Level Switch NBI-LIS-58A Due to Corrosion. Corrosion Cleaned from Inside Switch Case & Switch Replaced

ML19312A204
Person / Time
Site:	Cooper
Issue date:	08/02/1979
From:	Noyes C NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19275A132	List: ML19275A131 ML19312A204
References
LER-79-005-03X, LER-79-5-3X, NUDOCS 7908310420
Download: ML19312A204 (1)

Text

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NRC.FOR44 366 U. S. NUCLEAR REGULATORY COMMISSION g.773 UPDATE REPORT PREVIOUS REPORT DATE MARCH 12, 1979 LICENSEE EVENT REPORT lh CONTROL BLOCK: l_ l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 7

o t 8 9 lNlElClPlRl1l@l0 0 l- l0 l0 l0 l0 l- l0 l010 l@l4 l1 LICENSE LICENSEE CODE 14 15 LICENSE NUMBER 25 26 l1 11TYPE l1 JOl@lS7 CAT 58l@

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EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h o 2 l During normal operation, reactor recirculation motor generator set "A" tripped due to I o 3 ] failure of level switch NBI-LIS-58A. Technical Specification 3.6.F.3 sllows operation l o 4 Iof up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> with one recire. loop out of service. There was no significant oc- l o s Icurrence as a result of this event. There was no adverse affects to public health I o s and safety. This event is repetitive. (Reference LER 76-48) l o 7 l l o 8  !

SYSTEM CAUSE CAUSE COMP. VA LV E CODE CODE SUBCODE COMPONENT CODE SUSCODE SU 3CC f" 7

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.O SEQU ENTI AL OCCURRENCE REPORT REVISION LE R, RO EVENT YEAR R EPORT NO. COCE TYPE N O.

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31 32 1l 21 22 23 24 26 27 TK r ACh0N ONP NT M HOURS S8 i FOR 8. SL PPLI E R MANUFAC RER lAl@[Z,j@

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 o ITrio of "A" RRMC set was enused bv level su4 *4 NAT-T T9-9 9 A rnrvncinn kn41 Ann 4 I i 3 lthe switch caused it to actuate. NBI-LIS-58A is a Yarway Model 3318C level Indicatine]

, , gswitch. All corrosion was cleaned from inside the switch case and the switch was re- l g lplaced. All other Yarway level indicators of this type were inspected and all areas l 3 4 lwhere moisture could enter the case have been sealed. l 7 8 9 80 ST  % POWER OTHER STATUS dis O RY DISCOVERY DESCRIPTION i 5 l E j@ l 0l 9 l 5 lg[ NA l Algl Reactor Recire. Pump Trip l ACTIVITY CO TENT RELEASED CF RELE ASE AMOUNT OF ACTivlTY LOCATION OF RELEASE NA NA 7

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45 80 PERSONNEL EXPOSURES NUVBER TYPE DESCRIPTION i 7 l 0 l 0 l 0 l@[Zj@l NA l PER$cNNEt',N2ubES N -eE R DSCR,P1,0~@ ./- 033

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