ML20212A259

PNO-III-90-14A:on 900306,high Bearing Temperature Resulted in Common EDG for Two Units to Be Declared Inoperable on 900305

ML20212A259
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	03/06/1990
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-90-014A, PNO-III-90-14A, NUDOCS 9710230223
Download: ML20212A259 (1)

Text

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PRELItilNARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE Pfi0-III-90-14A Date fiarch 6,1990 lNws a u (c y This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public F M st significance. The information is as initially received without verification or i' 'ition, and is basically all that is known by the Region III staff on this date.

Facility: Comonwealth Edison Co. Licensee Emergency O C(\

Zion Units 1 & 2 Classification:

Zion, IL 60099 _X Unusual Event Alert Docket No. 50-295 Docket No. 50-304 Site Area Emergency General Emergency hf O

_ Not Applicable /8M pu - J ,it Up Subj:ct: SHUTDOWNTOREPAIRDIESELGENERATOR-----(UPDATE) t The licensee is continuing its investigation to determine the cause of the high bearing tempsrature which resulted in the comon emergency diesel generator for the two units to be d clared inoperable on March 5, 1990. Each unit also has two dedicated diesel generators.

Tha two units were placed in Hot Shutdown on March 1 as required by the Technical Specifications. The Region III (Chicago) Regional Administrator issued a Temporary Waiver of Compliance on March 2, 1990, permitting the units to remain in Hot Shutdown until March 6 rath2r than going to Cold Shutdown. With the concurrence of the Office of Nuclear Reactor Regulation, this. Waiver was extended on March 6, 1990, for six days, for Unit 2 only to permit it to perform necessary safety system surveillance tests prior to its refueling outags. This extension will prevent the licensee from subjecting Unit 2 to an additional thermal cycle on the primary system. The unit will be placed in Cold Shutdown on March 12, 1990, for the refueling outage, originally planned to begin March 22. Unit I has been p d in Cold Shutdown for a short maintenance outage kb icensee intends to examine the comon diesel's bearings for possible damage to dritsrmine the cause of the high temperature readings. Region III will continue to monitor the licensee's activities.

-Tha State of Illinois will be informed of this updated information. (This information has been reviewed with licensee management.)

This updated information is current as of 10:00 a.m., March 7, 1990.

CONTACT: T. Martin (FTS 388-5573) W. Shafer (FTS 388-5656)

DISTRIBUTION:

SV HEADQUARTERS OFFICES REGIONS MAIL T0:

Chairman Carr NM55 Region I DC5 (Orig)

Com., Roberts GPA:SLITP Region II D0T (Trans. D I Com. Rogers GPA:PA Region IV Only)

Com. Curtiss GPA:CA Region V Com. Remick *0lG EDO *ASLAP FAX TO:

G:n. Counsel Research INPO NSAC LIC ~,

TM IRM NRC O W CTR x "d 9- dN 06.

l ACRS PDR(8/634-3343) k.scement .E 'a!

• Denotes a Displaywriter/PC not an IBM 5520 Terminal.

9710230223 900306 Rev. 12/05/89 PDR I&E PNO-III-90-14A PDR

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