05000344/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Encl

Forwards LER 82-002/03L-0.Detailed Event Analysis Encl

ML20040H180
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	02/04/1982
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20040H181	List: 05000344/LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Encl 05000344/LER-1982-002-03, /03L-0:on 820109,following Reactor Trip,Both Source Instrumentation Channels Failed to Energize.Caused by Improper Actuation of Instrument Crowbar Circuit.Channels Energized When Power Fuses Were Removed & Reinserted
References
CPY-113-82, NUDOCS 8202170393
Download: ML20040H180 (2)

LER-1982-002, Forwards LER 82-002/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3441982002R00 - NRC Website

text

e k ammeg 69 2 Portland General Electric Company February 4, 1982 Trojan Nuclear Plant CPY-ll3-82 P.O. Box 439 Rainier, Oregon 97048 O

(503)S56-3713 g

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SECEIVED Mr. R. H. Engelken, Director US Nuclear Regulatory Conunission t

FEB111982> ;8

" g ginalIs [isIII W Creekside Oaks Offico W

1450 Maria Lane - Suite 260 Walnut Creek, California 94596-5368 O

Dear Sir:

In accordance with the Trojan Plant Operating License, Appendix A, USNRC Technical Specification 6.9.1.9.b, attached is Licensee Event Report No.

82-02 concerning a failure of both source range instruments to automati-cally energize following a reactor trip.

Sincerely, hf C. Paul Yundt General Manager CPY/GGB/KLN:ga Attachments c:

LER Distribution 0 ?Ql3y 0 Nd 8-gy,,g ff$4' I j

CiG GAGMy 8202170393 820204 l

PDR ADOCK 05000344 O

PDR I

s REPORTABLE OCCURRENCE 1.

Report No:

82-02 2.

Report Date:

February 5, 1982 3.

Occurrence Date:

January 9,1982 4.

Facility: Trojan Nuclear Plant, PO Box 439, Rainier, Oregon 97048 5.

Tdentification of Occurrence:

During a plant shutdown following a manual reactor trip, both source range nuclear instrumentation channels failed to energize. Therefore the plant was operating in a degraded mode permitted by a limiting condition for operation, Technical Specifications, Table 3.3-1.

6.

Conditions Prior to Occurrence:

The plant was in Mode 3 following a reactor trip from 100% power.

7.

Description of Occurrence:

Following a manual reactor trip an operator noticed that even though the required permissives were satisfied, both channels of source range instrumentation failed to energize.

The shutdown margin was properly verified per the Technical Specifications.

8.

Designation of Apparent Cause of Occurrence:

High voltage on both channels failed to energize due to actuation of the crowbar circuit, a voltage surge protection device.

9.

Significance of Occurrence:

This occurrence had no effect on plant or public safety since the reactor was shut down and operating within the constraints of the Technical Specifications. The shutdown margin was promptly verified.

10.

Corrective I,ction:

Immediate corrective action taken was to reset the crowbar device by removing the instrument control power fuses and reinserting them.

Both channels of instrumentation energized.

This is a repeat of a previous event (Trojan LER 81-03).

Westinghouse redesign of the circuit was to have prevented this type of event.

Plant Maintenance is continuing to investigate the source range circuit design with the assistance of the vendor.