05000267/LER-1979-054, Forwards LER 79-054/03L-0

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Forwards LER 79-054/03L-0
ML19210E377
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 11/28/1979
From: Warembourg D
PUBLIC SERVICE CO. OF COLORADO
To: Seyfrit K
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210E378 List:
References
P-79282, NUDOCS 7912040429
Download: ML19210E377 (5)


LER-1979-054, Forwards LER 79-054/03L-0
Event date:
Report date:
2671979054R00 - NRC Website

text

.

puhue service company oe cenende (j

16805 Weld County Road 191/2, Platteville, Colorado 80651

..lw November 28, 1979 Fort S t.

Vrain Unit No. 1 P-79282 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 REF: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyfrit:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/79-54, Final, submitted per the requirements of Technical Specifi-ca tion AC 7. 5. 2 (b) 3.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/79-54.

Very truly yours, lhtW Y L

y Don Warembourg Manager, Nuclear Production DW/alk cc: Director, MIPC Aool 5

1475 129 j//

7 912 0 4 0 4-E ct

REPORT DATE:

November 28, 1979 AEPORTABLE OCCURRENCE 79-54 ISSUE O OCCURRENCE DATE:

October 29, 1979 Page 1 of 4 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATIEVILLE, COLORADO 80651 REPORT No. 50-267/79-54/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

Standby diesel engine IB tripped on high cooling water temperature during sur-veillance test because cooling water valves were lined up incorrectly.

This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)3.

EVENT

DESCRIPTION

On October 24, 1979, while operating at 26% thermal power and 50 MR electrical power, a mechanical clearance was issued at 0845 hours0.00978 days <br />0.235 hours <br />0.0014 weeks <br />3.215225e-4 months <br /> to repair a cooling water tube leak on the standby diesel engine 1B cooler, S-7539. See Figure 1.

The cooler, S-7539, has two cooling coils, one for the 1A engine and one for the 1B engine. The standard clearance point form specified that the inlet valve, V-42385, and the outlet valve, V-42384, both be shut and the bypass valve, V-42389 be opened. This isolated the cooler for repair of the leaking tube but still should have allowed the normal temperature control of the 13 diesel en-gine cooler via TCV-4268 if the diesel generator unit had been required.

However, the bypass valve, V-42389 was not open as specified, thus the cooling water to the 1B diesel engine was isolated.

On October 29, 1979, while the reactor was shutdown for scheduled maintenance, operations personnel performed the standby diesel generator 50% load test.

At 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br />, the 1A and 1B diesel engines were started and generator lA was rjnchronized and loaded to 50% per the surveillance test.

The test is performed on a weekly basis and continues for at least two hours to enable the engines and generators to attain nor=al operating temperatures.

At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />, the 1B diesel engine automatically tripped on high cooling water te=perature of 500'F and declutched the engine.

CAUS E

DESCRIPTION

An incorrect valve lineup caused the 1B diesel engine to trip on high cooling water temperature, g75 3

REPORTABLE OCCURRENCE 79-54

~

ISSUE O Page 2 of 4 CORRECTIVE ACTION:

Cooling water was restored to the 13 diesel engine cooler.

Personnel involved have been reinstructed in the proper methods to be used for clearing out equipment.

Standby diesel generator surveillance test completed.

No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 79-54 ISSUE O Page 3 of 4 om o

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To lA Engine Cooler From Service Water

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&A VR YM V-42384 V-42385 S-7539 V-42389 (Not open as required by clearance) 4 [ 'xx 1B Engine Inner q

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Cooler Juter

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Service Water 4

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> Recum to Serme Water TCV-4268 975 132

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FIGURE 1

REPORTABLE OCCURRENCE 79-54 ISSUE O Page 4 of 4 Prepared by:

Miqhael J. Ferris'

~

Technical Servicea Engineer Reviewed by:

M W. Gahm echnical Services Supervisor Reviewed by:

x Frank M. Mathie Operations Manager Approved by:

W b

MW A

Don Warembourg Q/

Manager, Nuclear Production 1475 133