05000344/LER-1981-020, Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

ML20039G841
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	12/11/1981
From:	Yundt C PORTLAND GENERAL ELECTRIC CO.
To:	Engelken P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CPY-980-81, NUDOCS 8201190207
Download: ML20039G841 (2)

LER-1981-020, Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3441981020R00 - NRC Website

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Dear Sir:

Attached is Revision 1 to Licensee Event Report No. 81-20, concerning failure l

of the "B" Train Control Room Chlorine Detector unit. The corrective action originally taken to prevent binding of the motor shaft was apparently insuffi-cient as the same failure occurred again two months later. On this occasion, the corrective action taken was to replace the entire blower motor. The "A" Train Chlorine Detaction System was operable at all times, therefore, there was no effect on plant or public health and safety, a

Sincerely, l

C. P. Yundt General Manager CPY/MLD/KLN:mae Attachments c:

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UPDATE REPORT - DATE OF PREVIOUS REPORT October 6, 1981

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REPORTABLE OCCURRENCE 1.

Report No.:

81-20, Revision 1 g

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Report Date:

December 11, 1981 b.

Occurrence Date: September 6 and November 11, 1981 4

3.

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

Identification of Occurrence:

During a routine plant tour, an Auxiliary Operator noticed that the blower to the Control Room "B" Chlorine Detector was not operating properly. Two months later, the same blower was discovered to have failed again.

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5.

Conditicns Prior to Occurrence:

i The plant was in Mode 1 at 1007. power and steady state operation on both occasions.

I 6.

Description of Occurrence:

l The Chloralert Blower Ibtor on the Chlorine Detector was not working properly, which rendered the detector inaperable. The unit is a Fischer-Porter Model 17CA1010 Chloralert Blower Motor.

7.

Designation of Apparent Cause of Occurrence:

The electric motor on the blower appeared to be binding as lubricant 4

applied to the motor bearing would free the blower for a short time.

l 8.

Analysis of Occurrence:

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I Inspection showed that a dirty bearing on the blower motor was causing l

the motor to bind. There was no ef fect on plant or public safety sines the "A" Train Control Room Chlorine Detector was operable.

9.

Corrective Action

Upon discovery, the detector was immediately taken out of service and the Contrcl Room ventilation was transferred to the emergency recirculation mode pcr S.T.S. 3.3.3.6.

The motor bearing was cleaned and lubricated, the flow metering tube was cleaned, and the detector was calibrated and returned to service on September 8,1981.

Following the seconi identical failure of the blower, the entire blower motor was replaced to prevent recurrence. Periodic inspection and cleaning of the chlorine Detector units has been added to the prevantive maintenance program.

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LICENSEE EVENT REPORT EXHIBIT A CcNTRot. steCm i f ! ! ! I fQ tetEAsE PRWT OR TYPE ALL REQUIRED WFORMATICM i

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e EVENT ossCRIPTION AND PRC8ASLE CCNSEQUENCES h'id gl AT FULL POWER OPERATION, AN OPERATOR DISCOVERED "B" TRAIN CONTROL ROOM i

[TTTl CHLORINE DETECTOR WAS NOT OPERATING' DURING A ROUTINE SHIFT TOUR.

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io!.ii FAILURE OCCURRED AGAIN ON NOVEMBER 11, 1981. TWO INDEPENDENT SYSTDfS ARE I f

f io isi t REQUIRED PER S.T.S. 3.3.3.6.

THE "A" TRAIN DETECTOR WAS OPERABLE. PROB- ;

i o,,, i l ABLE CONSEQUENCES WERE MINIMAL. THERE WAS NO EFFECT ON PUBLIC HEALTH OR g

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l, j a i l THE BEARING ON THE BLOWER MOTOR CAUSED IT TO BIND. THE DETECTOR WAS TAKEN,

I TT1 i OUT OF SERVICE AND CONTROL ROOM VENTILATION SWITCHED TO EMERGENCY RE-i

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i,,.i t FAILURE, THE ENTIRE BLOWER MOTOR WAS REPLACED. PERIODIC CLEANING HAS 8,;ciuvv BEEN ADDED IO THE PREVEN VEgl g.pANCE PROGRAM.

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