05000267/LER-1979-058, Forwards LER 79-058/03L-0

Forwards LER 79-058/03L-0

ML19253C899
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/04/1979
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19253C900	List: 05000267/LER-1979-058, Forwards LER 79-058/03L-0 05000267/LER-1979-058-03, /03L-0:on 791107,during Reactor Shutdown,Line Supplying Backup Bearing Water to 1A Helium Circulator Determined to Be Impaired Due to Impaired Hanger.Caused by Missing Anchor Bolt & Stripped Anchor Bolt Shield
References
NUDOCS 7912120324
Download: ML19253C899 (3)

LER-1979-058, Forwards LER 79-058/03L-0

Event date:
Report date:
2671979058R00 - NRC Website

text

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j pubue service company oe odorade 16805 Weld County Road 191/2, Platteville, Colorado 80651

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December 4, 1979 Fort St. Vrain Unit No. 1 P-79294 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Of fice 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. 50-267/79-58, 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. 50-267/79-58.

Very truly yours, [h

Don Warembourg Manager, Nuclear Production DW/cis cc:

Director, MIPC Aco'J 1541 352 3

7012120 3 2 !!

J. pr REPORT DATE:

December 6,1979 REPORIABLE OCCURRENCE 79-58 ISSUE O OCCURRENCE DATE:

November 7. 1979 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 REPORT NO. 50-267/79-58/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

At 1326 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.04543e-4 months <br /> on November 7,1979, the line supplying backup bearing water to LA helium circulator was determined to be impaired due to i= paired hanger 10A-H-21208. Since the reactor.had been operated at power prior to discovery of the condition, this is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2 as a degraded mode of LCO 4.3.10.

EVENT

DESCRIPTION

On November 7,1979, with the reactor shutdown for scheduled maintenance, hanger 10A-H-21208 was determined to be impaired. This hanger is on the line supplying backup bearing water to the LA helium circulator. Although the backup bearing water line is not Class I, the hanger is included in the analysis of a Class I system; therefore, its impairment constitutes an impairment of System 21.

Although the reactor was shutdown at the time this hanger was determined to be impaired, LCO 4.3.10(d) requires that the hanger be made operable prior to reactor startup.

Necessary repairs to the hanger were completed at 1324 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.03782e-4 months <br /> on November 8, 1979, with the reactor still in a shutdown condition.

CAUSE

DESCRIPTION:

One of the anchor bolts to this hanger was missing and the shield to the other anchor bolt was stripped. These factors caused the hanger to be i= paired.

CORRECTIVE ACTION:

The missing anchor bolt and defective bolt shield were replaced and the hanger was verified operable. There was no affect on public health or safety, and no further corrective action is anticipated or required.

1541 353

REPORTABLE OCCURRENCE 79-58 ISSUE O Page 2 of 2 a.

il Prepared by:

_ JR.

M '. cLc l's Cathy C'. Hirsch Technical Services Technician Reviewed by:

d

. w. ca-Technical Services Supervisor Reviewed by:

4'M !d Frank M. Mathie Operations Manager Approved by:

'J N,,

kun Don Warembourg

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Manager, Nuclear Production 1541 354