PNO-I-87-118, on 871221,reactor Tripped Due to Loss of Load. Caused by Opening of Generator Output Breaker Due to Ground Fault on Permanent Magnet Generator (PMG) Stator Winding. Replacement Pgm Will Be Procured

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PNO-I-87-118:on 871221,reactor Tripped Due to Loss of Load. Caused by Opening of Generator Output Breaker Due to Ground Fault on Permanent Magnet Generator (PMG) Stator Winding. Replacement Pgm Will Be Procured
ML20238C126
Person / Time
Site: Calvert Cliffs Constellation icon.png
Issue date: 12/22/1987
From: Lester Tripp
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-87-118, NUDOCS 8712300064
Download: ML20238C126 (1)


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D:S No: 50318871221 Date: 12 / Z2./87 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-87-118 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 & Electric Co. Notification of Unusual Event Calvert Cliffs Nuclear Power Plant Alert Unit 2 Site Area Emergency Docket No. 50-318 General Emergency X Not Applicable

SUBJECT:

PLANT TRIP

~~

At 6:10 p.m. on 12/21, the reactor tripped due to a loss of load. All plant equipment operated as designed except for one steam dump valve which stuck open and had to be shut manually. The loss of load condition was initiated by the opening of the generator output breaker schich opened due to a ground fault on the permanent magnet generator (PMG) stator winding. (The PMG provides control power for the output breaker.)

The licensee is performing limited corrective maintenance while procuring a replacement PMG. Estimated time of return to power is 12/25 contingent upon receipt of replacement PMG.

The State of Maryland has been notified CONTACT: L. Tripp (FTS 488-1227)

DISTRIBUTION:

H. St. _ MNBB Phillips E/W Willste Mail: ADM:DMB Chairman Zech EDO NRR NMSS DOT:Trans only Comm. Roberts PA OIA RES Comm. Bernthal OGC AE00 NRC Ops Crt i Comm. Carr Comm. Rogers ACRS Air Rights INPO----

SECY SP NSAC----

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

(Reactor Licensees) i Region I Form 83 4 (Rev. August 1987) i i

1 1

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8712300064 871222 l

54 1

-I -118 DCD [ -

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