05000344/LER-1981-001, Forwards LER 81-001/03L-0

Forwards LER 81-001/03L-0

ML19340F109
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/09/1981
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML19340F110	List: 05000344/LER-1981-001, Forwards LER 81-001/03L-0 05000344/LER-1981-001-03, /03L-0:on 801212,blown Fuse Was Found in Breaker Control Power Circuit for Vent Supply Fan to turbine-driven Auxiliary Feedwater Pump Room.Cause Unknown.Fuse Replaced
References
CPY-031-81, CPY-31-81, NUDOCS 8101190443
Download: ML19340F109 (2)

LER-1981-001, Forwards LER 81-001/03L-0

Event date:
Report date:
3441981001R00 - NRC Website

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!503)556 3713 CPY-031-81 Mr. R. H. Engleken, Director Nuclear Regulatory Commission, Region 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 3/4.7.1.2, attached is Licensee Event Report No. 81-01, concerning a situation where the vent supply fan for the turbine-driven auxiliary feedwater pump room was inoperable due to a blown fuse in the breaker control power circuit.

Sincerely, C.

. Yundt General Manager CPY

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LER Distribution List

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8101190 W S

REPORTABLE OCCURRENCE 1.

Report No.:

S1-01 2.

a.

Report Date:

January 9, 1981 b.

Occurrence Date: December 12, 1980 3.

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

Identification of Occurrence:

A blown fuse was found in the breaker control power circuit for the vent supply fan to the turbine-driven auxiliary feedwater pump room.

5.

Conditions Prior to Occurrence:

The plant was in Mode 1 at 100" of rated power when the blown fuse was discovered.

6.

Descriotion of Occurrence:

During normal operations surveillance patrols, a blown fuse was found in the breaker control power circuit for the vent supply fan to the turbine-driven auxiliary feedwater pu=p room.

The turbine-driven auxiliary feed-water pump would have operated nor= ally upon receipt of an auto start signal, but the vent supply fan would not have started and the lack of ventilation would eventually cause the pu=p to overheat. Adequate venti-lation could have been supplied by opening the door to the pump room.

7.

Designation of Apoarent Cause of Occurrence:

The cause of the occurrence was electrical fase failure.

Electrical checks of the circuit revealed no cause for the blown fuse.

8.

Analysis of Occurrence:

This occurrence had no effect on plant or public safety.

Both trains of auxiliary feedwater were available. The turbine-driven auxiliary feedwater punp could have operated long enough for ventilation to be restored.

9.

Corrective Action

I= mediate corrective action was taken by performing electrical checks on the control power circuit for a short, ground, or overcurrent. The fuse was replaced and the fan was tested satisfactorily. No further corrective action is required.