PNO-I-89-046, on 890621,unusual Event Declared Due to Plant Shutdown,Necessitated by Excessive RCS Leakage Into C Steam Generator,During Which Auxiliary Feedwater Auto Start & Auto Isolation Experienced.Generator Levels Reestablished

PNO-I-89-046:on 890621,unusual Event Declared Due to Plant Shutdown,Necessitated by Excessive RCS Leakage Into C Steam Generator,During Which Auxiliary Feedwater Auto Start & Auto Isolation Experienced.Generator Levels Reestablished

ML20245E835
Person / Time
Site:	Beaver Valley
Issue date:	06/22/1989
From:	Limroth D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-89-046, PNO-I-89-46, NUDOCS 8906270470
Download: ML20245E835 (1)

y DCS No: 50412890622 f

~ Date: J0ne 22, 1989 i l

PR$LIMISARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-89-46 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 i staff on this date.

Facility: Licensee Emergency Classification:

Duquesne Light Company X Notification of Unusual Event Shippingport, PA Alert Beaver Valley Power Station Unit 2 Site Area Emergency Docket Nuraber* S0-412 General Emergency Not Applicable

Subject:

UNUSUAL EVENT DUE TO PRIMARY TO SECONDARY LEAK 3

Beaver Valley Unit 2 declared an Unusual Event at approximately 10:00 p.m. on June 21, 1989, due to plant shutdown necessitated by excessive RCS leakage into ,

the "C" steam generator. The preliminary leak rate was estimated at about 495 i gallons per day (GPD) (Technical Specification limit is 600 GPD) and the licensee  !

elected to shut down after sample results indicated the inventory loss was into the "C" steam generator. Followup tests after the unit was stabilized in hot shutdown (Mode 3) indicated a leak rate of about 177 GPD. The Unusual Event was terminated at 4:10 a.m.,

June 22, 1989.

1 The Senior Resident Inspector responded to the site to monitor licensee activities. j The licensee currently plans to continue plant cooldown in order to permit necessary repairs.

During the cooldown the unit experienced an AFW auto start (0045) and feedwater auto isolation (0645) due to low and high steam generator levels respectively. 'In both cases, the levels were reestablished and the ESF reset.

The Commonwealth of Pennsylvania has been notified.

CONTACT: D. F. Limroth (FTS 346-5121)

DISTRIBUTION: 1 OWFN MNBB H-St. NL Mail: ADM:DMB <

Chairman Zech AE00 ACRS RES DOT:Trans only Comm. Roberts ARM PDR Comm. Carr OGC NRC Ops Ctr Comm. Rogers Comm. Curtiss INPD----

SECY NMSS NSAC----

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

(Reactor Licensees)

Region I Form 83 (Rev. April 1988) 8906270470 890622 PDR I&E O h' / /.

PNO-I-89-046 PDC

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