05000267/LER-1981-017, Forwards LER 81-017/03L-0

Forwards LER 81-017/03L-0

ML20008F648
Person / Time
Site:	Fort Saint Vrain
Issue date:	03/19/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20008F649	List: 05000267/LER-1981-017, Forwards LER 81-017/03L-0 05000267/LER-1981-017-03, /03L-0:on 810217,standby Diesel Engine 1B Tripped on High Cooling Water Temp.Caused by Sticking Temp Control Valve.Valve Disassembled,Cleaned & Returned to Svc
References
P-81098, NUDOCS 8104210463
Download: ML20008F648 (4)

LER-1981-017, Forwards LER 81-017/03L-0

Event date:
Report date:
2671981017R00 - NRC Website

text

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T 1 puhue service company of Cdonedo 16805 ROAD 19%

PLATTEVILLE, COLOR ADO 80651 i

March 19,' 1381 Fort St. Vrain Unit No, 1 P-81096

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b Mr. Karl V. Seyfrit, Director 4

Nuclear Regulatory Comission

• d Region IV

'j Office of Inspection and Enforcement

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3 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Reference: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyf rit:

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

81-017, Final, submitted per the requirements of Technical Specification 1

AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/81-017.

Very truly yours, bA W

l Don Warembourg r/

l Manager, Nuclear Production l

DW/cls Enclosure 00) cc: Director, MIPC 3

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REPORT DATE:

March 19, 1981 RE?ORTABLE OCCURRENCE S1-017 ISSUE O OCCURRENCE DA!E:

February 17, 1931 Page 1 of 3 FORT ST. VRAI:' NUCLEAR GENERATION STA!!CN PUBLIC SERVICE COMPANY OF COLORR0 16805 WELD COU57Y ROAD 19 1/2 PLATTEVILLE, COLORADO S0651 REPORT No. 50-267/81-017/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During regular surveillance,13 diesel engine (K-9204X) tripped approximately 10 =inutes after the start of the test. This is reportable as a degraded mode of LCO 4.6.1.d) per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

On February 17, 1981, at 0855 hours0.0099 days <br />0.238 hours <br />0.00141 weeks <br />3.253275e-4 months <br />, la and 13 diesel engines were started and 1A diesel generater was synchronized and Icaded to 501 as per the Sur-veillance Test.

This Surveillance Test is run weekly for a mininun of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> to enable diesel engines and generator to reach normal operating paraneters.

At 0905 hours0.0105 days <br />0.251 hours <br />0.0015 weeks <br />3.443525e-4 months <br />, the 13 diesel engine automatically tripped and declutched from the generator. The local alaru pane indiceted the trip to be due to high cooling wa ter temperature set at 200*F.

A check of the engine cooling system verified the valve lineup to be correct.

DESCRIPTION

The apparent cause for the trip was a sticking temperature control valve on the 1B engine cooler outlet. The temperature control valve is d signed to fully open when the diesel engine is started, then modulate as necessary to naintain the engine cooling water setpoint of 117'F.

Results personnel investigating the trip discovered the te=perature control valve would stick while stroking open or closed. Apparently, the alve stuck in the closed or nearly closed position, effectively isclating the engine cooling water and causing the trip. Valve sticking was due to buildup of inpurities in the service water on the valve stes.

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REPORTA3tE CCCURRENCE 81-017 155"E O Page 2 of 3 CCRRICTI7E ACTION:

The temperature control val */e was disassembled, cleaned, and repacked.

Af ter calibration, the valve was returned to service.

The temperaturo centrol valves on the other three engires will be checked for operation and serviced as necessary.

Standby diesel surveillance test was completed.

No further corrective actica is anticipated or required.

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2EPORTABLE CCCUP.RENCE 31-017 1$5UE O Page 3 of 3 a

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Prepared By:

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P a t. A Moore Technical Services Technician

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Reviewed By:

. W. G(na

,/ echnical Jarvices Supervisor T

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Reviewed Sy:

f/ / I 's N ' I d Frank ?!. Mathie Operations Manager

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TJ<t-s_ l Approved 37:

Don Wa embourg g/

Manager, Nuc..ar Produe: ion