PNO-I-85-080, on 851017,plant Tripped on Low Level Due to Loss of All Three turbine-driven Main Feed Pumps.Cause Unstated.Reactor Vessel Level Recovered by HPCI & RCIC Injection

From kanterella
Jump to navigation Jump to search
PNO-I-85-080:on 851017,plant Tripped on Low Level Due to Loss of All Three turbine-driven Main Feed Pumps.Cause Unstated.Reactor Vessel Level Recovered by HPCI & RCIC Injection
ML20133K180
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 10/17/1985
From: Gallo R, Johnson T
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-85-080, PNO-I-85-80, NUDOCS 8510210102
Download: ML20133K180 (1)


DCS No: 50-00277851017 Date: October 17, 1985 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-85-80 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: Peach Bottom, Unit 2 Licensee Emergency Classification:

Philadelphia Electric Co. X Notification of Unusual Event DN 50-277 Alert Site Area Emergency General Emergency

___Not Applicable

Subject:

REACTOR SCRAM FROM 100*; POWER DUE TO LOSS OF FEEDWATER At 9:21 a.m., 10/17/85, the unit automatically tripped on low level (0 inches) due to the loss of all three turbine-driven main feed pumps. The lowest indicated reactor vessel level achieved was -95 inches (-178 inches is top of active fuel - TAF). An ENS notification and Unusual Event were declared.

Plant systems responded normally recovering level and controlling primary systems isolation.

At approximately 9:26 a.m., reactor vessel level was recovered to +30 inches by HPCI and RCIC injection, and primary pressure was being controlled by steaming to the main condenser.

The Unusual Event was terr;inated at 10:12 a.m.

The senior resident was in the control room during the event and will continue to follow licensee actions.

The Commonwealth of Pennsylvania has been notified.

CONTACT: R. M. Gallo 488-1234 T. Johnson 717-456-7614 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 AEOD Comm. Roberts Comm. Asselstine ACRS Air Rights INP0----

SECY SP NSAC----

CA POR Regional Offices TMI Resident Section RI Resident Office asiO210102 851017 - * - - - - - -

pop ILE (Reactor Licensees)

ANO-I-85-080 PDR i '

IE-S4 oh