05000267/LER-1982-038, Forwards LER 82-038/03L-0.Detailed Event Analysis Encl

Forwards LER 82-038/03L-0.Detailed Event Analysis Encl

ML20066B911
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/01/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20066B914	List: 05000267/LER-1982-038, Forwards LER 82-038/03L-0.Detailed Event Analysis Encl 05000267/LER-1982-038-03, /03L-0:on 821003,w/reactor Operating at 1% Power, Alternate Cooling Method Diesel Generator Tripped on a Phase Overcurrent.Caused by Speed Oscillations Due to Faulty Viking Fuel Pump.Pump Replaced & Fuel Tank Cleared
References
P-82493, NUDOCS 8211090245
Download: ML20066B911 (3)

LER-1982-038, Forwards LER 82-038/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671982038R00 - NRC Website

text

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r public service company or conendo 16805 Road 19 1/2, Platteville, Colorado 80651-9298 November 1, 1982 Fort St. Vrain Unit No. 1 P-82493 i'[M@ Ml\\V/PV,rN s

4 Mr. John T. Collins, Regional Administrator i

g 4g Region IV i

Nuclear Regulatory Commission L_

i_f 611 Ryan Plaza Drive 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. 50-267/82-038, 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. 50-267/82-038.

Very truly yours, t

AL 7Yn Don Warembourg Manager, Nuclear Production DW/cls Enclosure i

cc: Director, MIPC V

7 b

fy f 8211090245 821101 i PDR ADOCK 05000267

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REPORT DATE:

November 1, 1982 REPORTABLE OCCURRENCE 82-038 ISSUE O OCCURRENCE DATE:

October 3, 1982 Page 1 of 2 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/82-038/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On October 3, 1982, with the reactor operating at 1% power, the alternate cooling method (ACM) diesel generator tripped during performance of a weekly surveillance test; therefore, it is considered to have been inoperable since September 25, 1982, when it was last successfully tested. During this time period, the reactor was operated at power, thus constituting a degraded mode of LCO 4.2.17.

This occurrence is being reported per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

l On October 3,1982, at 0105 hours0.00122 days <br />0.0292 hours <br />1.736111e-4 weeks <br />3.99525e-5 months <br />, the alternate cooling method (ACM) diesel generator was started for a weekly operational surveillance test.

As the diesel attained operating temperatures, the generator was synchronized to the plant's electrical system for performance of a load test.

At 0215 hours0.00249 days <br />0.0597 hours <br />3.554894e-4 weeks <br />8.18075e-5 months <br />, the diesel generator tripped on "A"

phase overcurrent prior to successfully completing the surveillance test.

CAUSE

DESCRIPTION:

The cause for this occurrence was determined to be a faulty fuel pump which caused a momentary variation in the diesel generator's speed.

This change in speed caused the overcurrent trip for the "A" phase.

CORRECTIVE ACTION:

The faulty fuel pump was replaced and, as a precautionary measure, the fuel day tank and associated piping were cleaned.

On October 7, 1982, at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />, the ACM diesel generator was retested successfully and placed back into an operable status.

No further corrective action is required nor anticipated.

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REPORTABLE OCCURRENCE 82-038 ISSUE O Page 2 of 2 Prepared By:

L hL Owen J. Clayton 3

Technical Services Technician Reviewed By: [

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,/ w C[arles Fuller Technical Services Engi eering Su ervisor v'

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y Reviewed By:

j Edwin D. g1M/ //'

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Station Manager Approved By:

b74 Don Warembourg

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Manager, Nuclear Production i

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