05000344/LER-1981-015, Forwards LER 81-015/03L-0.Detailed Event Analysis Encl

Forwards LER 81-015/03L-0.Detailed Event Analysis Encl

ML20010F463
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	08/28/1981
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20010F464	List: 05000344/LER-1981-015, Forwards LER 81-015/03L-0.Detailed Event Analysis Encl 05000344/LER-1981-015-03, /03L-0:on 810728,during Routine Operation,Steam Generator Blowdown Containment Isolation Valve MO-2813 Failed in Open Position.Cause Attributed to Valve Operator Motor Failure.Motor Replaced
References
CPY-655-81, NUDOCS 8109100245
Download: ML20010F463 (2)

LER-1981-015, Forwards LER 81-015/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3441981015R00 - NRC Website

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Portland General Electric Company Trojan Nuclear Plant P.O. Box 439 Rainier, Oregon 97048 (503)556-3713 August 28, 1981 CPY-655-81 ok$1 I 19 };q Mr. R. H. Engelken, Director

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Dear Sir:

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In accordance with the Trojan Plant Operar'ng Lice endix A, US NRC Technical Specifications, Paragraph 6.9.1.7, we are submitting Licensee Event Report No. 81-15.

This report describes a situation where the Technical Specification for containment isolacion valves was not satisfied due to an inoperable valve.

Sincerely,

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yQ Se, C. P. Yundt General Manager CPY/ WON:na Attachments c: LER Distribution List

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REPORTABLE OCCURRENCE 1.

Report No.:

81-15 2.

a.

Report Date:

August 27, 1981 b.

Occurrence Late: July 28, 1981 3.

Facility: Trojan Nuclear Plant, PO Box 439, Rainier, OR 97048 4.

Identification of occurrence:

Containment isolation valve MO-2813 for "B" Steam Generator Blowdown was found failed in its open position. This valve is required to function to maintain Contrinment integrity per Technical Specification 3.6.3.1.

5.

Conditions Prior to Occurrence:

The plant was operating in Mode 1 at 80% power.

6.

Description of Occurrence:

During routine operations the "B" Steam Generator Blowdown Containment I

Isolation Valve M0-2813 failed to close. Technical Specification 3.6.3.1 requires this valve b; aperable and capable of being auto-matically ehut by a containment isolation signal.

In its failed conditien, the valve could nar meet the requirenent.s for Containment integrity.

7.

Designation of Apparent Cause of 0 c; :cace:

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The cause of this event is attributed to motor fail *.:re of the valve nperator.

Ineulation breakdown cause the motor to short out.

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Significance of Occurrence:

This event had no adverse effect on either plant or public safety.

Cor.cainment integrity was met by shutting the redundant valve for this containment penetration as required by the limiting condition for operation.

9.

Corrective Action

Immediate corrective action was to close the redundant valve for the Containment penetration. The failed motor was then replaced.

Review of Equipment History Files showed no previous motor failures on safety-related valves in the Blowdown System.

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