PNO-III-86-014, on 860212 & 17,emergency Diesel Generator 2A Failed.Caused by Broken Rocker Arms on Left Cylinders 5 & 7, Respectively.Station Will Be Shut Down for 16 Days While Licensee Investigates Problem

PNO-III-86-014:on 860212 & 17,emergency Diesel Generator 2A Failed.Caused by Broken Rocker Arms on Left Cylinders 5 & 7, Respectively.Station Will Be Shut Down for 16 Days While Licensee Investigates Problem

ML20153E866
Person / Time
Site:	Byron
Issue date:	02/19/1986
From:	Forney W, Lerch R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-86-014, PNO-III-86-14, NUDOCS 8602250180
Download: ML20153E866 (1)

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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-14 Date Fcbrua'%19, d1 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III i staff on this date.

, Facility: Connonwealth Edison Company LicenseeEmergencyClassification:f Byron Unit 1 Notification of an Unusual Event Byron, IL 61010 Alert Site Area Emergency Docket No: 50-454 General Emergency i XX Not Applicable I

Subject:

DIESEL GENERATOR REPAIR

! At 8:15 a.m. (CST), February 17, 1986 Emergency Diesel Generator 2A failed during a 24-hour ,

1 test run as a result of broken rocker arms on the number 7 left cylinder. This was the j

s:cond failure of EDG 2A in five days.

! On February 12, during a 24-hour preoperational test run, rocker arms on the number 5 left cylinder failed. The licensee repaired the arms and after a successful surveillance, restarted EDG 2A, only to have it fail on February 17.

j B:cause of the rocker arm problem, the licensee has notified the EDG vendor, Cooper-Bessemer, which will send a representative to the site. In the meantime, Unit I will remain in cold shutdown. EDG 2A is required by technical specifications to be capable of operating as an emergency power supply for Unit l's motor-driven auxiliary feedwater pump.

(Byron Unit 2 is still under construction.)

. Unit 1 will be shut down for a 16-day period while the licensee investigates the diesel

! g:nsrator problem, and completes work that had previously been scheduled for April.

Region III (Chicago) will monitor the licensee's course of action.

Tho State of Illinois will be notified.

Region III learned of EDG 2A's second failure at 8

46 a.m., February 17, 1986. This informationiscurrentasof10a.m.,(CST), February 18, 1986, i

it D { b NA CONTACT: R. Lerch f W. Forney FTS 388-5779 FTS 388-5590 DISTRIBUTION:

- H. St. ED0 NRR E/W Willste Mail: ADM:DMB t

Chairman Palladino PA IE ' NMSS DOT:Trans only Conn. Zech ELD OIA RES Comm. Bernthal AEOD

, Comm. Roberts i Conn. Asselstine SP_l m o Regional Offices j ACRS 1 SECY INP0 IA: n NSAC l2 ;24

CA RIII Resident Office

PDR Licensee: 1 3 J Li (Corp. Office-ReactorLic.Only)

^

0602250100 840219 Region III PDR lhE Rev. November 1985 O l

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