05000267/LER-1981-035, Forwards LER 81-035/03L-0.Detailed Event Analysis Also Encl

Forwards LER 81-035/03L-0.Detailed Event Analysis Also Encl

ML20009E686
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/10/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20009E687	List: 05000267/LER-1981-035, Forwards LER 81-035/03L-0.Detailed Event Analysis Also Encl 05000267/LER-1981-035-03, /03L-0:on 810511,w/plant at 70% Thermal Power During a Diesel Generator Set Surveillance Test,B Engine Tripped & Declutched.Caused by Failed Exhaust Temp Switch. Switch Repaired.Test Completed.Generator Returned to Svc
References
P-81165, NUDOCS 8107280364
Download: ML20009E686 (4)

LER-1981-035, Forwards LER 81-035/03L-0.Detailed Event Analysis Also Encl

Event date:
Report date:
2671981035R00 - NRC Website

text

bb s o -207/el-3r puhuc service company or conendo 16805 ROAD 19%

PLATTEV1LLE, COLOR ADO 80651 June 10, 1981 fi $

Fort St. Vrain N

Unit No. 1 P-81165 6*

\\q% Y L Mr. Karl V. Seyfrit, Director

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a s Nuclear Regulatory Commission

. /gg Region IV Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012

Reference:

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

Dear Mr. Seyfrit :

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/

81-035, 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. 50-267/81-035.

Very truly yours, Don Warembourg Manager, Nuclear Production DW/cls En closure cc: Director, MIPC gll l

8107280364 810610 PDR ADOCK 05000267 5

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REPORT DATE:

June 10, 1981 REPORTABLE OCCURRENCE 81-035 ISSUE O OCCURRENCE DATE:

May 11, 1981 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 RdPORT NO. 50-267/81-035/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During normal surveillance testing, K-9204X, "B" diesel engine for "A" emergency generator set, tripped and declutched on starting.

This constitutes operation in a degraded mode per LCO 4.6.1(d) and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

On May 11, 1981, with the plant operating at steady state 70% thermal power and 230 MWe, Operations personnel were performing normal surveillance testing on the emergency diesel generators. When the "A" emargency diesel generator was started, the "B"

engine tripped and declutched, reducing the available output of "A"

diesel generator. The "B" diesel generator set was operable during this occurrence, and if necessary, "A" diesel generator set was available at a reduced output.

DESCRIPTION

The cause of the occurrence was a faulty temperature switch for "B" diesel engine. The temperature switch measures the engine exhaust manifold temperature after starting and activates a trip circuit to l

trip and declutch the effected engine if the exhaust temperature does not increase to 175 degrees fahrenheit within 30 seconds, indicative of an engine failure to start or an improper load balance. This is to prevent dragging down the associated engine and generator.

The failure of the temperature switch is attributed to normal wear.

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i REPORTABLE OCCURRENCE 81-035 ISSUE O Page 2 of 3 i

CORRECTIVE ACTION:

i The faulty temperature switch was replaced, and "A" emergency diesel i

generator set returned to service after surveillance testing was successfully completed.

4 No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 81-035 ISSUE O Page 3 of 3 Prepared By:

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Paul Moore Technical Services Technician Reviewed By:

W.'l3ahm

/ Technical Services Supervisor l

Reviewed By:

[ Mr[

FrinR W. Mathi6 (

Operations Manager Approved By:

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DonWaremoprg

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Manager, Nuclear Production i