05000267/LER-1981-064, Forwards LER 81-064/03L-0.Detailed Event Analysis Encl

Forwards LER 81-064/03L-0.Detailed Event Analysis Encl

ML20033A585
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/16/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20033A586	List: 05000267/LER-1981-064, Forwards LER 81-064/03L-0.Detailed Event Analysis Encl 05000267/LER-1981-064-03, /03L-0:on 811017,30 & 1102,four Class One Snubbers Were Out of Svc.One Snubber Ioperable Due to Thermal Pipe Expansion.Three Removed for Support Structure Welding Required by Seismic Analysis Program
References
P-81280, NUDOCS 8111250598
Download: ML20033A585 (4)

LER-1981-064, Forwards LER 81-064/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671981064R00 - NRC Website

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public service company of odlemde v'h 16805 Road 19 1/2, Platteville,' Colorado 80651-9298' November 16, 1981 Fort St. Vrain Unit-No. 1 P-81280

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Mr. Karl V. Seyfrit, Director NOV9 419815' I

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Nuclear Regulatory Commission 3

Region IV

" "sk,,m, gen ui Office of Inspection and Enforcement 611 Ryan Plaza Drive g;f._

Suite 1000 s/

'm 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. 50-267/81-064, 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. 50-267/81-064.

Very truly yours, h Wow Don Warembourg Manager',' Nuclear Production DW/lsb Enclosure F

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Director, MIPC in 4919 l981 A

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PDR ADOCK 05000267 5

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REPORT DATE:

November 16, 1981 REPORTABLE OCCURRENCE 81-064 ISSUE 0'.

OCCURRENCE DATE:

October 17, 1981 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. 50-267/81-064/03-L-0 Final IDENTIFICATION 10F OCCURRENCE:

On three separate occasions during the period from October 17 until

' November 3, 1981, four class one snubbers were out of service.

This is a degraded mode of LCO 4.3.10 and is reportable per Fort St.

Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

Event #1 On October 17, 1981,f during normal plant operation, at approximately 40% reactor power.and 118 MWe, plant maintenance personnel. found by field observation that vent stack snubber VSS-111 was low on oil and extended to the limit of its travel.

This made the snubber inoperable.

The snubber was removed from service, repaired and adjusted, then tested and returned to service on October 19 at 1740 hours0.0201 days <br />0.483 hours <br />0.00288 weeks <br />6.6207e-4 months <br />.

This single snubber failure does -not affect the surveillance interval.

Event #2 On October 30, 1981, boiler feed snubbers BFS-414E and BFS-417E were removed from service for support' structure modification.

They were returned to service the same day.

Event #3 On November 2, 1981, cold reheat snubber CRS-317 was removed from service for support structure modification.

It was returned to service November 3, 1981.

Events 2 and 3 do not constitute snubber failure and do not affect

,. the surveillance interval.

The support structure modifications were required by the continuing snubber seismic analysis program.

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REPORTABLE OCCURRENCE 81-064 ISSUE O Page 2 of 2 l

1 l

CAUSE

- DESCRIPTION:

Evant #1 The snubber was inoperable due to' thermal pipe expansion'which-extended the snubber until no further movement was possible.

Events #2 ano' #3 The snubber supports required additional welding per ongoing seismic analyses program.

CORRECTIVE ACTION:

Event #1 The snubber was removed from service, rebuilt, adjusted, and returned to service.

Event #2 and #3 Snubbers were removed from service.

The necessary welds were made and snubbers' returned to service.

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O REPORTABLE OCCURRENCE 81-064.

ISSUE 0 Page 3 of 2 Prepared By:

Asa Reed Senior Technical Services Technician Reviewed By:

s,/I

. Charles Fuller Technical Services Engineering Supervisor E/ /M/M Reviewed By:

Edwin D. Hill '

Station Manager Approved By:

N#d Don Warembourg Manager, Nuclear Pro tion l