05000267/LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Encl

Forwards LER 82-035/03L-0.Detailed Event Analysis Encl

ML20063N680
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/23/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20063N681	List: 05000267/LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Encl 05000267/LER-1982-035-03, /03L-0:on 820827,engine 1B of Standby Generator Set 1A Rendered Inoperable.Caused by Indicator Lamp &/Or Lamp Socket Short Circuiting,Causing 15 Amp Fuse to Blow in Engine 1B,125-volt Dc Cranking Circuit
References
P-82417, NUDOCS 8210050331
Download: ML20063N680 (4)

LER-1982-035, Forwards LER 82-035/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671982035R00 - NRC Website

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d public service cominny e cellesde 16805 Road 19 1/2, Platteville, Colorado 80651-9298 September 23, 1982 Fort St. Vrain Unit No. 1 P-82417 l

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Mr. John T. Collins, Regional Administrator jy Region IV j

Nuclear Regulatory Commission u

611 Ryan Plaza Drive

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a Suite 1000 Arlington, Texas 76011

Reference:

Facility Operating License No..DPR-34 Docket No. 50-267

Dear Mr. Collins:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/82-035, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/82-035.

Very truly yours, h~ 7Wt <J i

Don Warembourg l

Manager, Nuclear Production DW/cis I

Enclosure cc: Director, MIPC 8210050331 820923 PDR ADOCK 05000267 S

PDR

REPCRT DATE:

Seotember 23, 1982 REPORTABLE OCCURRENCE 82-035 ISSUE 0 OCCURRENCE DATE: Aucust 27, 1982 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/82-035/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On August 27, 1982, with the reactor operating at approximately 36%

power, a blown fuse rendered engine IB of the standby diesel generator set 1A (K-9201) inoperable.

This is a degraded mode of Fort St. Vrain Technical Specification LC0 4.6.1 and is reportable per AC 7.5.2(b)2.

EVENT

DESCRIPTION

At 1415 hours0.0164 days <br />0.393 hours <br />0.00234 weeks <br />5.384075e-4 months <br /> on August 27, 1982, an alarm at Control Room panel I-9306F, window 2-2,

" GEN 1A ENG 1A - ENG 18 TROUBLE," alerted Control Room operators to a malfunction of standby generator set 1/

(K-9201). An operator was dispatched to K-9201 to investigate.

He noted that all local controls were in the correct positions. The oper.ator also discovered that engine IB (K-9204X) " ENGINE READY" lamp was broken.

A plant electrician called to troubleshoot the situation discovered the 15 amp fuse on the 125 volt DC distribution panel to engine IB cranking circuit was burned out and that the lamp socket for engine IB " ENGINE READY" lamp was cracked and slightly rotated in its mounting.

The blown fuse rencered engine 18 of standby diesel generator set 1A inoperable, since the loss of 125 volts DC to the cranking circuit would have prevented engine 18 from being started either manually or automatically. The 1A standby diesel generator set would still have been available at a reduced output had it become necessary.

The IB engine of standby generator set 1A was made operable, and the set returned to service at 1445 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.498225e-4 months <br /> on August 27, 1982, within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> required by LCO 4.6.1.

CAUSE

DESCRIPTION:

The immediate cause of the malfunction was a blown 15 amp fuse in the 125 volt DC engine IB cranking circuit.

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i REPORTABLE OCCURRENCE 82-035 ISSUE 0 Page 2 of 3 The cause of the fuse being blown was attributed to a momentary short occurring across engine 1B " ENGINE READY" lamp. A faulty lamp was the most probable cause of the short, although the lamp socket may have contributed to or caused the lamp to short out.

CORRECTIVE ACTION:

The lamp socket and fuse were replaced, and a new lamp placed in the lamp socket.

The standby generator set 1A was tested successfully and returned to service within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed by Technical Specifications.

As a precautionary measure, other indicator lamp assemblies on the standby generator units were inspected for similar defects.

Since none were found defective, it was decided that this was an-isolated incident and, there#cre, no further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 82-035 ISSUE 0 Page 3 of 3 mh -

Prepared By:

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Paul A.' Tramp F

Technical Services Technician Reviewed By: _

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Charles Fuller Technical Services Engineering Supervisor Revi.ewed By:

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Edwin D. Hill f

Station Manager i

l Approved By:

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l Don Warembourg Manager, Nuclear Produc ion I

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