ML20154Q855

Special Rept 1-SR-86-007:on 860203,during Performance of Surveillance Test 41ST-1DG02,diesel Generator B Overspeed Trip Occurred.Caused by Fiber Optic Optical Transistor Failure.Fiber Optic Printed Circuit Board Replaced

ML20154Q855
Person / Time
Site:	Palo Verde
Issue date:	02/25/1986
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-86-007, 1-SR-86-7, ANPP-35304-EEVB, NUDOCS 8603240137
Download: ML20154Q855 (2)

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DECEIVED IP.C Arizona Nuclear Power ProJgt rc4 28 R412: 39 P O. BOX 52034 e PHOENIX, ARIZONA 85072-2034 February [h,bb6 ANPP-35304-EEVB/KLM/98.05 Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5638

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528, License No. NPF-41 Special Report - Nonvalid Diesel Generator Failure Due to a Fiber Optic Transistor Failure File: 86-020-404: G.1.01.10: 86-056-026

Dear Mr. Martin:

Attached please find a Special Report (1-SR-86-007) prepared and submitted pursuant to Technical Specifications 4.8.1.1.3 and 6.9.2. This report discusses a nonvalid diesel generator failure due to a component failure in the Fiber Optic System.

If you have any questions, please contact me.

Very truly yours, e-~

. CRA L. O 'N (m E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/KLM/ dim l Attachments j cc: R. P. Zimmerman (all w/a)

A. L. Hon E. A. Licitra A. C. Gehr INPO Records Center 8603240137 860225 PDR ADOCK 05000528 S PDR q' 550/

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PALO VERDE NUCLEAR GENERi11NG STATION UNIT 1

, Special Report No.1-SR 007

-NONVALID DIESEL GENERATOR FAILURE DUE TO A FIBER OPTIC TRANSISTOR FAILURE 4 -

Docket No.~STN-50-528 x License No. NPF-41 h

This Special Report of _ a Diesel Generator nonvalid failure is provided

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pursuant to Technical Specification Sections 4.8.1.1.3 and 6.9.2, and includes

the information recommended in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977.

.At -2350 on February 3, 1986, during performance of Surveillance Test '

41ST-1DG02 in accordance with Technical Specification 4. 8.1.1. 2a , a Diesel Generator _ "B" overspeed trip occurred as a result of a Fiber Optic optical transistor failure. This is not to be considered a valid test or failure because the trip was caused by a component. failure in the Fiber Optic System.

The Fiber Optic System is bypassed in the Emergency Mode of operation and, s therefore, would not have prevented Diesel Generator "B" from starting in the

-event of an emergency actuation signal.

At the time of this event, there had been 3 Diesel Generator failures in the last 100 valid tests (on a per nuclear unit basis) and the test interval. of not,more than 7 days was being implemented in accordance with the schedule of l

Regulatory Position C.2.d of Regulatory Guide 1.108.

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' The Fiber Optic printed circuit board containing the faulty optic transistor was replaced.

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A valid test was performed and Diesel Generator "B" was returned to OPERABLE j status at 1612 on February 5, 1986.

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