ML19339C598

Forwards LER 80-063/03L-0

ML19339C598
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/14/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19339C599	List: ML19339C598 ML19339C603
References
P-80401, NUDOCS 8011180659
Download: ML19339C598 (4)

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a public service company of Cenoemde

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16805 ROAD 19% T':!

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November 14, 1980 Fort St. Vrain Unit No. 1 . . , ,

P-80401 "O Mr. Karl V. Seyfrit, Director Nuclear Regulatory Cot:nission Region IV Office of Inspection and Enforcecent 611 Ryan Plaza Drive Suite 1000 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. 5'l-267/

80-63, Final, submitted per the requirements of Technical Specification

.L 7.5.2(b}3.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/80-63.

Very truly yours, 0 77*

Don Warembourg -

Manager, Nuclear Production DW/cis Enclosure cc: Director, MIPC /

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REPORT DATE: November 14, 1980 REPORTABLE OCCURRENCE 80-63 ISSUE O OCCURRENCE DATE: Oc tober 17. 1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WEID COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/80-63/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On October,1980, an unsampled gas waste release was made contrary to the requirement of LCO 4.8.1. This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)3.

EVENT DESCRIPTION:

An authorized release from a gas waste surge tank was to be made. The tank was sampled and analyzed in accordance with LCO 4.8.1, and the gaseous radio-active effluent continuous monitors were verified to be operable and opera-ting. During the valve lineup f or the release, a valve was inadvertently lef t open which diverted the gas waste surge tank contents to the gas waste vacuum tank.

The vacuum tank is protected against over-pressure by two parallel rupture discs and relief valves which discharge into the same line as a normal re-lease from the gas waste surge tanks. When the gas released from the gas waste surge tank over-press",rized the vacuum tank, a rupture disc ruptured and the associated relief valve lif ted, releasing the contents of the vacuum tank, which had neither been sampled nor analyzed as required by LCO 4.8.1.

The gaseous radioactive effluent monitors tested prior to the re lease did not indicate any radioactive release. However, an auxiliary monitor of greater sensitivity indicated a short term (less than 5 minutes) release above background that did not exceed the maximum permissible co< centration allowed by LCO 4.8.1. Calculations indicate a release of 0.01~ curies of noble gases through the reactor plant exhaust system.

CAUSE DESCRIPTION:

l The cause of this event was a broken valve stop which prevented the valve l f rem being closed fully. '

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REPORTABLE OCC RRENCE 80-63 ISSUE O Page 2 of 3 CCRRECTIVE ACTION:

When alarms were received due to the over-pressurizing of the gas waste vacuum tank, the valve with the broken stop was closed, the correct valve lineup was established, and the release completed via the normal flow path.

The broken valve stop and the burst rupture disc were replaced.

I No further corrective action is anticipated or required.

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O REPORTABLE OCCJRRENCE 90-63 4

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ISSUE O Page 3 of 3 Prepared By: <[ W e dC%.

Richard R. Frost Technical Services Technician Reviewed By: .

. W.'Gahm Technical Services Supervisor Reviewed By: b M jdsry,s 4%4 JW Frank M. !!athie '

Operations Manager (/

Approved By: A. Yw Don '/arembourg g Mant.ger, Nuclear Production i

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