ML19337A252

LER 80-034/03L-0:on 800729,during Surveillance Test of Standby Gas Treatment Sys 1 (SGTS 1),overload Trip Was Experienced on SGTS Exhaust Fan 1-8.Probable Cause:Unusually High Ambient Temp Around Fan Motor Control Cubicle

ML19337A252
Person / Time
Site:	Oyster Creek
Issue date:	09/02/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19337A236	List: ML19337A234 ML19337A252
References
LER-80-034-03L, LER-80-34-3L, NUDOCS 8009090373
Download: ML19337A252 (3)

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8 60 on DOCKET NUV8ER EVENT OESCRIPTTCN ANO PRC8ABLE CONSEQUENCES h i o ! 21_ l On July 29, 1980 during a routine surveillance test of the standbv gas 1 Io isl l treatment system #1 (SGTS #1), an overload trip was experienced on SGTS I l344; l exhaus e fan 1-8. Automatic circuitry started SGTS 12 which perfor: led I ioistl satisf acto rily. he safety significance of the event is considered I i;is ; l minimal since SGTS 42-vas available and oper'able if the need for its i jo;7i l operation had occurred. I I

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a 47 CAUSE CESCRIPT?CN AND CCRRECrtVE ACrIONS h It 13i } The accarent cause of the overlead trio was unusuntiv high

=~M e w e- ~. I lt it I I erature around the motor control cubiele for fan 1-8. h e nve- b d --n- 1 I,t2i i cective device was reolaced and SGTS 41 was tested satisfactortiv. An I ,

1 !s t i engineering investiration is in oretress to dete =ine what sters can he l l 141 l taken to avoid recuirence of tries due to hizh a ibient conditions . I f

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OYSTER CREEK NUCLEAR GENERATING STATION '.

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1 Licensee Event Report Reportable Occurrence No. 50-219/80-34/ 3L Repor: Date September 2, 1980 ,

Occurrence Date July 29, 1980 ,

Identifi_ation of Occurrence Operation of the Standby Gas Treatment System in a degraded mode as allowed by Technical Specification, paragraph 3.5.B.3 when standby gas treatment system #1 was found :o be inoperable during a scheduled surveillance test. - .

31s event is considered to be a reportable occurrence in :he Technical Specifi-cations, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence The plant was operating at steady state power.

Power: Reactor,1660 We Electrical, 542 W e Flow: Recirculation 13 x 10 3pm Feedwater, 6.00 x 10* lb/hr Pressure: 1020 psig Stack Gas Activity: 4.085 x 103 aci/sec Description of Occurrence On Tuesday, July 29,1980 at 2346 hourt, during a routine surveillance :est of

he s:andby gas :reatment system I (3GTS !), an overload trip was experienced 1 on SGTS exhaus: fan 1-8. Automatic circuitry started SGS 92 which perforned satis f acto rily.

Apparent Cause of Occurrence A subsequen investigation revealed that an overload trip on the "3" phase of E? l-3 had occurred. S e apparen: cause for the overload trip was an unusually high x2 bien: :*mperature around the noter control cubicle (106*y) .

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Analvsis of Occurrence

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Standby gas treatment system is 'used to process the reactor building atmosphere should conditions be' present which require its operation ~ Although SGTS ~ fl

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p ,became~1noperable. SGTS 12 did' initiate and performed as designed.

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The . safety ' significance of this event is considered minimmi since SGTS #2 was '

available and operable if the need for'its operation had occurred.

Corrective Action

'SGTS 11 (Fan 1-8) was. removed from service and the overload protective device- a replaced. An operability test was performed to prove the' system operable.

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' As part of the investigation of the overload trip, the =otor control center breakers for SGTS 11~ (I71-8) and SGTS , d2 (IF 1-9) and their related fusos.

. breakers and overloads were checked and found to be satisfactory.

-In addition,;the amperage of the motor was found to be in compliance with its design. The full load name place current rating is 12.8 amps. The full lead .

current was measured at 13.2 amps which is well within the 1.15 rated service s fac to r.

An Engineering investigation is in progress to determine what steps can be taken m to" avoid recurrence of trips due to high ambient conditions as experienced. ,  ;

-Failure Data .

General ~Ilectric -

.Model CR124-C028

-Mocor Overload Relay.

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