PNO-I-85-087, on 851120,reactor Scram Occurred Due to Main Generator Trip Causing Main Turbine Trip.After Scram,Main Steam Lines Isolated.Plant Brought to Cold Shutdown.Operator Manually Initiated Isolation Condenser

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PNO-I-85-087:on 851120,reactor Scram Occurred Due to Main Generator Trip Causing Main Turbine Trip.After Scram,Main Steam Lines Isolated.Plant Brought to Cold Shutdown.Operator Manually Initiated Isolation Condenser
ML20137L304
Person / Time
Site: Oyster Creek
Issue date: 11/20/1985
From: Bateman W, Blough A
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-85-087, PNO-I-85-87, NUDOCS 8512030409
Download: ML20137L304 (1)


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DCS No: 50219851120

, Date: November 20, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-85-87 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.

p Facility: General Public Utilities Licensee Emergency Classification:

F Nuclear-Corporation Notification of Unusual Event Oyster Creek Nuclear Alert .

Generating Station Site Area Emergency Forked River, NJ General Emergency DN 50-219 X Not Applicable i

Subject:

UNPLANNED SCRAM AND STEAM LINE ISOLATION 4

About 9:00 a.m., November 20, the reactor- scrammed from 70 per cent power. due

'to a main turbine trip. The turbine had tripped due to a main generator trip-on 'B' phase generator fault ~ indication. After the scram, the Main Steam Lines isolated. Operators manually initiated the isolation condenser to remove

!. -decay. heat and used feedwater to control reactor level. No abnormal releases of: radioactivity occurred. The licensee is placing the plant in cold shutdown and investigating the causes of the' generator fault indication and the steam line isolation. The resident inspectors observed control room response actions and will follow-up on licensee evaluations.

, The State.of New Jersey has been notified. The licensee has issued a press '

release. .This PN is issued due to the potential of public or media interest.

CONTACT: W. Bateman A. Blough 609-693-0702 FTS 488-1146 I

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 AE00 Comm. Roberts Comm. Asselstine

, ACRS- Air Rights INPO----

SECY SP NSAC----

- CA PDR Regional Offices TMI Resident Section

' RI Resident Office Licensee

(Reactor Licensees)

.iagion.: 7arn 33 (Rev. ' July,.1984) 8512030409 851120 d -087 PDH

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