PNO-I-85-076, on 851009,reactor Shut Down After Unsuccessful Attempt to Identify Cause of 1.5 Gpm Leak from Reactor Coolant Pump 11A Controlled Bleed Off Line.Caused by Cracked Weld

PNO-I-85-076:on 851009,reactor Shut Down After Unsuccessful Attempt to Identify Cause of 1.5 Gpm Leak from Reactor Coolant Pump 11A Controlled Bleed Off Line.Caused by Cracked Weld

ML20133G801
Person / Time
Site:	Calvert Cliffs
Issue date:	10/10/1985
From:	Elsasser T, Foley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-85-076, PNO-I-85-76, NUDOCS 8510160128
Download: ML20133G801 (1)

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s DCS No: 50317/851010 Date: October 10, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-85-76 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 I staff on this date.

Facility: Licensee Emergency Classification:

Baltimore Gas and Electric Co. X Notification of Unusual Event Calvert Cliffs Unit 1 Alert Lusby, Maryland Site Area Emergency General Emergency

Not Applicable

Subject:

UNSCHEDULED SHUTDOWN REQUIRED BY TECHNICAL SPECIFICATIONS l At 9:58 P.M. on October 9, the licensee entered mode 2 (hot shutdown) and declared an unusual event. This followed unsuccessful attempts to identify the cause of unidentified reactor coolant leakage of greater than 1 gpm. This declaration was due to the unscheduled shutdown required by Technical Specifications for the 1.5 gpm' leak from the #11A RCP controlled bleed off line. Initial reports from technicians viewing the leak from several feet indicate that it is the result of a cracked weld on the #11A RCP/ bleed of f line junction. The licensee has had similar occurances at the same location in the past. The plant is proceeding to cold shutdown to effect repairs. Current plans are to drain the RCS to below the level of the leak and either repair the weld or replace the seal package entirely. The repair is estimated to take 5 days.

The State of Maryland has been notified.

CONTACT: T. Foley T. Elsasser 301-586-2626 FTS 488-1378 DISTRIBUTION:

H. St. ~

MNBB Phillips E/W Willste Mail: ADM:DMB Chairman Palladino EDO NRR IE NMSS DOT:Trans only Comm. Zech PA OIA RES Comm. Bernthal ELD AEOD Ccmm. Roberts Comm. Asselstine ACRS Air Rights INP0----

SECY SP NSAC----

CA PDR Regional Offices TMI Resident Section l RI Resident Office l

Licensee:

(Reactor Licensees)

Region I Form 83 (Rev. July, 1984) i 8510160128 851010 i

POR ILE PDR

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PNO-I-85-076 l

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