05000219/LER-1980-034-03, /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

/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: 05000219/LER-1980-034, Forwards LER 80-034/03L-0 05000219/LER-1980-034-03, /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
References
LER-80-034-03L, LER-80-34-3L, NUDOCS 8009090373
Download: ML19337A252 (3)

LER-1980-034, /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

Event date:
Report date:
2191980034R03 - NRC Website

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treatment system #1 (SGTS #1), an overload trip was experienced on SGTS I

Io isl l l344; l exhaus e fan 1-8.

Automatic circuitry started SGTS 12 which perfor: led I

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

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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 s-

,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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