05000344/LER-1980-021, Forwards LER 80-021/01T-0

Forwards LER 80-021/01T-0

ML19339B700
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	10/31/1980
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML19339B701	List: 05000344/LER-1980-021, Forwards LER 80-021/01T-0 05000344/LER-1980-021-01, /01T-0:on 801003,during Temporary Plant Test,Msiv C Did Not Fully Close.Caused by Component Failure.Valve Was Shut W/Steam Flow.Permanent Corrective Action Under Investigation
References
CPY-1076-80, NUDOCS 8011070496
Download: ML19339B700 (2)

LER-1980-021, Forwards LER 80-021/01T-0

Event date:
Report date:
3441980021R00 - NRC Website

text

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Portland General Electric Company Trojan Nuclear Plant

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P.O. Box 439 October 31, 1980 Rainier, Oregon 97048 CPY-1076-80 (503)556 3713 2

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....i Mr. R. H. Engelken, Director Nuclear Regulatory Commission, Ragion V 1990 North California Blvd.

Walnut Creek, California 94596

Dear Sir:

In accordance with the Trojan Plant Operating License, Appendix A, US NRC Technical Specifications, Paragraph.3.7.1.6, attached is Licensee Event Report No. 80-21, concerning a situation where a main steam isolation valve failed to close as required.

Sincerely, C.

undt General Manager CPY/JCP:na Attachments c: LER Distribution List a

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f REPORTABLE OCCURREN Q 1.

Report No.:

80-2i 2.

a.

Report Date:

October 31, 1980 b.

Occurrence Date: October 3, 1980 t

3.

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

Identification of Occurrence:

A =*n steam isolation valve failed to fully close as required.

O 5.

Conditions Prior to Occurrence:

The plant was in Mode 2 at approvintely 2% power.

6.

Description of Occurrence:

During a temporary plant test, "C" main steam isolation valve failed to fully close in response to a manual closing signal.

i 7.

Designation of Apparent Cause of Occurrence:

The apparent cause of this occurrence is component failure. The failure j

to close was due to mechanical binding of the valve stem.

8.

Analysis of Occurrence:

This event had no effect on plant or public safety. This event was the result of a planned activity to specifically conduct a temporary plant

' test to verify that the main steam isolation valves would go closed with steam flow in the min steam line. The initial conditions of the test i

required a MSIV to be stuct open following an attempt to manually close the valves with zero flow conditions. The test was conducted successfully and verified that the min steam isolation valves do, in fact, go closed with a small amount of steam flow. Refer to LER 80-05.

9.

Corrective Action

The immediate corrective action taken was to conduct the temporary plant test. The test was conducted successfully and the valve closed.

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