PNO-I-86-053, on 860719,scram Occurred When Reactor Pressure Spike Caused High Neutron Flux Signal.Caused by MSIV Closure During Offsite Power Trip Resulting in Loss of Emergency Power.Util Will Repair Failed Dc Coil on MSIV

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PNO-I-86-053:on 860719,scram Occurred When Reactor Pressure Spike Caused High Neutron Flux Signal.Caused by MSIV Closure During Offsite Power Trip Resulting in Loss of Emergency Power.Util Will Repair Failed Dc Coil on MSIV
ML20203E716
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 07/21/1986
From: Johnson T
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-86-053, PNO-I-86-53, NUDOCS 8607240228
Download: ML20203E716 (1)


DCS No: 5027819860719 Date: July 21, 1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-86-53 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: Philadelphia Electric Co. Licensee Emergency Classification:

Peach Bottom Unit 3 ~ ~ ~ Notification of Unusual Event Docket No. 50-278 Alert Site Area Emergency General Emergency X Not Applicable

Subject:

PLANT SHUTDOWN GREATER THAN 48 HOURS At 4:07 p.m. on July 19,1986, Unit 3 scrammed from 87% power when a reactor pressure spike caused a high neutron flux scram signal. The pressure spike was caused by a main steam isolation valve (MSIV) closure when one of the offsite power sources tripped, resulting in a momentary loss of plant emergency power. Power was restored with the other offsite power source and the scram response was normal. The licensee made an ENS call. The unit is currently in cold shutdown. The licensee will repair a failed DC coil on the MSIV that closed in addition to performing miscellaneous maintenance activities. The outage is scheduled for several days.

The Commonwealth of Pennsylvania has been notified.

CONTACT: T. Johnson 488-1234 DISTRIBUTION:

H. St. MNBB _ Phillips E/W Willste Mail: ADM:DMB Chairman Zech EDO NRR IE _ NMSS DOT:Trans only PA OIA RES Comm. Bernthal ELD AE00 Comm. Roberts Comm. Asselstine ACRS Air Rights INP0----

SECY SP NSAC----

CA POR Regional Offices TMI Resident Section RI Resident Office _

Licensee:

(Reactor Licensees)

Region I Form 83 (Rev. July,1986)

G60724022G G60/21

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