PNO-III-86-013, on 860219,both Unit 2 Diesel Generators & Units 1 & 2 Shared Diesel Declared Inoperable.Cause Undetermined.Partially Closed Fuel Line Valve on Diesel Generator 2A Discovered.Generators Retested

PNO-III-86-013:on 860219,both Unit 2 Diesel Generators & Units 1 & 2 Shared Diesel Declared Inoperable.Cause Undetermined.Partially Closed Fuel Line Valve on Diesel Generator 2A Discovered.Generators Retested

ML20205K268
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	02/20/1986
From:	Chrissotimos N, Suermann J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-013, PNO-III-86-13, NUDOCS 8602270244
Download: ML20205K268 (2)

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'D rn13 l PREL'MINARY' NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-13 Date February 20, 1986 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety cr public interest significance. The information is as initially received without IN verification or evaluation, and is basically all that is known by the Region III staff on this date.

Facility: Comonwealth Edison Company Licensee Emergency Classification:

Zion Units 1 and 2 XX Notification of an Unusual Event Zion Illinois 60099 Alert Site Area Emergency Docket Nos: 50-295; 50-304 General Emergency Not Applicable

Subject:

DIESEL GENERATORS INOPERABLE IN TESTS Tha licensee declared an Unusual Event under its emergency plan at 9:25 p.m.,

February 19, 1986, when both of the Unit 2 diesel generators and the Unit 1/2 shared diesel wera declared inoperable. The licensee began shutting the unit down in accordance with the plant's Technical Specifications. (Both Unit I and 2 were operating at 99 per cent power.)

Tha 28 diesel generator was declared inoperable during a surveillance testing as a result of blown fuses on an annunciator panel (although the diesel generator would have started automatically, if required). The 2A diesel generator also failed to operate properly during subsequent testing. The shared diesel (designated 0) was started successfully, but then tripped for an unknown reason.

Both of the Unit I diesel generators were successfully tested.

Tha licensee discovered a partially closed fuel line valve on the 2A diesel generator. Once the valve was opened, the 2A diesel was successfully tested. The licensee then terminated th2 unusual event classification at 12:30 a.m., February 20, 1986.

Both Unit 1 and 2 remain in a 7-day Limited Condition of Operation because the cause of the shared diesel generator (0) failure has not been determined. The 0 generator was satisfactorily tested, but the licensee was unable to duplicate the trip.

The failure of the diesel generators is being reviewed by the Resident Inspector and by the R;gion III (Chicago) staff.

DISTRIBUTION:

H. St. ED0 NRR E/W Willste Mail: ADM:DMB Chairman Palladino PA IE NMSS D0T:Trans only l Com. Zech ELD OIA RES  !

Com. Bernthal AEOD Com. Roberts Com. Asselstine SP )*.4Q Regional Offices ACRS SECY INPO l*-@ NSAC 1:6 0_

CA RIII Resident Office PDR Licensee: S 8 (. (Corp. Office - Reactor Lic. Only) 8602270244 860220 Region III p' (

PDR 18E Rev. November 1985 L PNO-111-96-013 PDR

PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-13 Date February 20, 1986

' Thm States of. Illinois and Wisconsin will be informed.

Thera has been local news media interest in the event.

Region III (Chicago) was notified of the diesel generator problem by the Headquarters Duty Officer at 9:35 p.m., February 19, 1986. This information is current as of 11 a.m.,

Fchruary 20, 1986.

1 i CONTACT:

e _].p

. 5uermann N. Chrissotimos J8A "J M '

FTS 388-5585 FTS 388-5716 s

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