ML20249B909

PNO-76-160:on 760919,fire Occurred in Generator Portion of Diesel Generator 2A.Fire Was Caused by Overheating of Generator & Switching Error.State of Il Notified

ML20249B909
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	09/20/1976
From:	Roy G, Thompson D, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-76-160, NUDOCS 9806250025
Download: ML20249B909 (1)

Text

September 20, 1976 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-76-160 This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically c11 that is known by IE staff on this date.

Facility: Commonwealth Edison Company, Zion Unit 2 (DJ 50-304)

Morris, Illinois

Subject:

DIESEL GENERATOR FIRE At approximately 12:30 a.m. on September 19, 1976, Zion Unit 2 was in power ascension following a scbeduled weekend maintenance outage, when a fire occurred in the generator portion of the 2A Diesel Generator.

Due to an operator switching error, the diesel generator was called upon to assume an overloaded condition that caused overheating of the ,

generator and resultant fire. The switching error also initiated a l number of other cetions including a trip of the reactor, loss of trans-fer power and loss of ability to trip breakers for several electrical busses, an inadvertent safety injection, and luss of computer readout.

The fire was put out by actuation of the installed carbon dioxide system.

The local fire department responded to the fire but was not r quired.

The consequences of the fire outside the generator casing was limited to smote damage. No radioactive releases or personnel injuries occurred.

The generator will require a complete rewind estimated to take a minimum of twelve (12) days. The reactor is currently in hot shut-down and will be placed in cold shutdown.

IE:III inspectors were at the cite by 6:00 a.m. on September 19 to review the occurrence. They are currently evaluating the event.

I l

A press release has been made by Commonwealth Edison and Region III.

There has been local news media publicity associated with the incident.

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l The state of Illinois has been notified. Region III received noti- /)

l fication of this occurrence by telephone from the corporate office A at 2:00 a.m. on September 19, 1976. 9

Contact:

RFWarnick, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 l

Distribution: l Chairman Rowden Commissioner Mason S. J. Chilk, SECY I

, Commissioner Gilinsky C. C. Kammerer, CA G, 7. Murphy, JCAE l Commissioner Kennedy L. V. Lussick, EDO E. Volgenau, OIE J. A. Harris, PA B. C. Rusche, NRR H.- K. Shapar, ELD T. J. McTiernan, AIA K. R. Chapman, NMSS R. G. Ryan, OPS Transmitted: PBldg  ; H St.  ; MNBB _: Luge  ;

PRELIMINARY NOTIFICATION

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9806250025 760920 h-7-60 N

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