ML20247C971

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PNO-89-059:on 890718,reactor Manually Tripped from 50% Power After Loss of Air Ejectors Caused Decreased Condenser Vacuum Condition.Cause of Failure Not Immediately Evident,However Air Ejectors Shifted Due to Slightly Degraded Vacuum
ML20247C971
Person / Time
Site: Pilgrim
Issue date: 07/18/1989
From: Blough R, Warren C
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-89-059, PNO-I-89-59, NUDOCS 8907240492
Download: ML20247C971 (1)


Text

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L DCS No: 50293890718

'Date: July 28,1989 - 2 l PRELIMINARY NOTIFICATIGW 0F EYENT OR UNUSUAL OCCURRENCE--PNO-I-89-59 r .

I

' 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

l. staff on'this date.

l Facility: Licensee Emergency Classification:

l Boston Edison Company- .

Notification of Unusual Event

Pilgrim Nuclear Power Station Alert Plymouth, MA Site Area Emergency

. Docket No. 50-293 General Emergew7 X Not Applicable

Subject:

REACTOR TRIP About 10:26 a.m. ,, July 18, 1989, operators manually tripped the reactor from 50 percent power after loss of the operating air ejectors caused a decreasing condenser vacuum condition. Plant systems responded normally to the trip; no ECCS or safety-relief valve actuation was needed and none occurred. The plant is in stable hot shutdown and the licensee is beginning an evaluation and post-trip review. The cause of the air ejector failure was not immediately evident; however, air ejectors were being shifted at the time due to slightly degraded vacuum.

The NRC Restart staff is following up on-site. The licensee has issued a press release, and Region I has responded to media inquiries.

The Commonwealth of Massachusetts has been notified.

CONTACT: C. Warren R. Blough 508-747-0565 8-346-5146 DI.STRIBUTION:

OWFN MNBB H-St.

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NL Mail: ADM:DMB Chairman Carr XEUD hCR5 Ti[S DOT:Trans only ,

Comm. Roberts ARM PDR Comm. Rogers OGC NRC Ops Ctr Comm. Curtiss-INP0----

SECY NMSS NSAC----

CA NRR OGC OIA Regional Offices GPA 01 RI Resident Office PA SLITP EDO DE Licensee:

TReactorLicensees)

Region I Form 83 (Rev. April 1988) 8907240492 890718 PDR 18eE O [(

PNO-I-89-059 PNV

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