ML20249B378

PNO-76-062:on 760401,svc Water to Lube Oil Cooling Sys for Unit 2 Main Turbine,Feedwater Pumps,Condensate Pumps & Heater Drain Pumps Isolated Through Operator Valving Error. Preliminary Insp Indicates Turbine Bearing Damage

ML20249B378
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	04/02/1976
From:	Roy G, Thompson D, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-76-062, PNO-76-62, NUDOCS 9806220380
Download: ML20249B378 (1)

Text

_ _ _ - - _ _ - -

~ ~ .

'*/

N 8Md8)# V April 2, 1976 PRELIMINARY NOTIFICATION E ENT UIUSUAL L CURRENCE --PNO-76-62 This preliminary notification cons utes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 2:00 p.m. on date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURFfNCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.

Facility: Commonwealth Edison Company (Zion Unit 2)

Subjeg : LOSS OF SERVICE WATER TO MAIN TURBINE, FEEDWATER PUMPS, AND CONDENSATE PUMPS LUBE COOLERS At approximately 6:00 a.m. on April 1, 1976, the service water to the lube oil cooling systems for the Unit 2 main turbine, feedwater pumps, condensate pumps and heater drain pumps was isolated through an operator valving error. The operator had been instructed to isolate the service water return line to the discharge tunnel on Unit 1. -

Instead, he closed the isolation valve on Unit 2. At approximately 8:10 a.m. an instantaneous puff of fire was observed from the No. 9 bearing on the Unit 2 main generator and the unit was manually shut down. No known safety problems resulted from shutting down the

! reactor. Preliminary inspection indicates that the No. 5 turbine l i bearing is damaged due to the isolation of the turbine lube oil cooling system. .

A planned outage originally scheduled for the next week to modify

! the condensate systems for Units 1 and 2 was advanced to incorporate repairs to the turbine. No estimate on outage length is available j at this time.

The licensee is currently reviewing the incident. No press release is planned by the licensee. Region III (Chicago) is following the g j cause and corrective actions of the licensee. ,#

. /

Region III received notification of this occurrence by telephone l

from an inspector on site at 3:30 p.m. on April 1, 1976. This d information is current as of 9:00 a.m. on April 2, 1976.

Contact:

RFWarnick, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 2

}

I Distribution:

Chairman Anders Commissioner Mason S. J. Chilk, SECY l

Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE

Commissioner Kennedy C. C. Kammerer, CA t_

L. V. Gossick, EDO J. G. Davis, OIE J. A. Harris, PA ,

B. C. Rusche, NRR J. La Fleur, ISP T. J. EcTiernan, AIA

' - ,; ,()K.R. Chapman,NMSS H. K. Shapar. ELD 3 Transmitted: P Bids  ; H St  ; MNBB3  ; Luge

{- PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 9806220300 760402 PDR 18 E O

' l PNO-76-062 PDR