05000344/LER-1981-024, Forwards LER 81-024/03L-0.Detailed Event Analysis Encl

Forwards LER 81-024/03L-0.Detailed Event Analysis Encl

ML20032D369
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	11/02/1981
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20032D370	List: 05000344/LER-1981-024, Forwards LER 81-024/03L-0.Detailed Event Analysis Encl 05000344/LER-1981-024-03, /03L-0:on 811003,emergency Diesel Generator Declared Inoperable Due to Blown Fuse & Loss of Dc Power. Caused by Failure of Indicator Lamp Socket.Lamp Socket & Dc Fuse Replaced
References
CPY-850-81, NUDOCS 8111130707
Download: ML20032D369 (2)

LER-1981-024, Forwards LER 81-024/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3441981024R00 - NRC Website

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PECEIVED

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E 801fl0V-4 AM D se Portland General Electric Cornpany Trojan Nuclear Plant P.O. Box 439 FIG l0Hye,t Rainier, Oregon 97048 (503) 556-3713 November 2, 1981 CPY-850-81 [8

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Mr. R. H. Engelken, Director h

US Nuclear Regulatory Commission

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1450 Maria Lane t Q u.s. % % (Jf Walnut Creek, California 94596-5368 m

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Dear Sir:

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In accordance with the Trojan Plant Operating License, p ix A, US NRC Technical Specifications, Paraa,raph 6.9.1.9.b, attached is Licensee Event Report No. 81-24, concerning a situation shere DC control power was lost to the "A" Train Emergency Diesel Generator rendering the unit hoperable. Therefore, the plant was operating in a degradeci mJe permitted by Limiting Condition for Operation 3.8.1.1.

Sincerely, C. P. Yundt General Manager C /MLD/KLN:na Attachments c: LER Distribution List th O Ohoh4 PDR t

o REPORTABLE OCCURRENCE 1.

Report No.:

81-24 2.

a.

Report Date:

November 2, 1981 b.

Occurrence Date: October 3, 1981 3.

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

Identification of Occurrence:

DC control power for the "A" Train Emergency Diesel Generator (EDG) was lost which rendered the unit incapable of auto-starting. The EDG is required to be operable by Technical Specification 3.8.1.1.

5.

Conditions Prior to Occurrence:

The plant was in Mode 1, power operations, at 100% power.

6.

Description of Occurrence:

The "AUT0" indicating lamp socket for the "AUT0/ MAINTENANCE" switch' located on the local control panel for the "A" Tra1A ELG had broken and had fallen back into the panel, shorting the DC control circuitry which blew the fuse.

This caused a loss of control power tr that EDG, which rendered the unit incapable of auto-starting and actuated the annunciator in the Control Room.

7.

Designation of Apparent Cause of Occurrence:

This failure was attributed to normal wear-and-tear due to replacing of light bulbs in the socket.

8.

Analysis of Occurrence:

There was no effect on either plant or public safety since the redundant train EDG was verified operable and no conditions requiring Emergency Diesel Generator operation existed during the time the "A" EDG was out of service.

9.

Corrective Action

The corrective action taken was to replace the socket, lamp, and fuse.