PNO-I-87-022, on 870317,hi-hi APRM Flux Scram & Group II & III Primary Containment Isolations Occurred.Caused by Electrohydraulic Control Sys Fluctuations.Unit in Cold Shutdown.Isolations Reset

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PNO-I-87-022:on 870317,hi-hi APRM Flux Scram & Group II & III Primary Containment Isolations Occurred.Caused by Electrohydraulic Control Sys Fluctuations.Unit in Cold Shutdown.Isolations Reset
ML20207T260
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 03/18/1987
From: Cowgill C
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-87-022, PNO-I-87-22, NUDOCS 8703230363
Download: ML20207T260 (1)


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DCS No: 50278870317 Date: March 18, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-87-22 This preliminary notification constitutes EARLY notice of events of POSSIBLE saf ety cr pubite interest significance. The information is as initially received without v:rification 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 Atomic Power Notification of Unusual Event Station Alert DN 50-278 Site Area Emergency Delta, PA 17314 General Emergency X Not Applicable

Subject:

UNPLANNED SHUTDOWN IN EXCESS OF 48 HOURS Peach Bottom Unit 3 scrammed from 86% power at 2:54 a.m. on March 17, 1987 due to Average Power Range Monitor (APRM) high high flux. Electro Hydraulic Control (EHC) system fluctuations caused the turbine control valves to oscillate which resulted in a reactor pressure increase and high high APRM flux scram. No ECCS were initiated. A group II and III primary containment isolation occurred, which was reset. System re-sp:nse following the scram was normal. The Itcensee made an ENS call and notified the Senior Resident Inspector. The unit is in cold shutdown to repair a leak in the C2 feedwater heater, perform other maintenance and investigate the EHC system malfunction.

The Itcensee plans to remain shut down for about five days.

1 .The Commonwealth of Pennsylvania has been informed.

CONTACT: C. Cowgill 215-337-5234 DISTRIBUTION: -

H. St. MNBB Phillips E/W W111ste Mail: ADM:0MB Chairman Zech EDO SF T NMSS DOT:Trans only Comm. Bernthal PA OIA RES Comm. Roberts ELD AE00 NRC Ops Crt Comm. Asselstine Comm. Carr ,

, ACRS Air Rights INPOM SECY SPJfut NSACAIE#

CA 1 POR Regional Offices TMI Resident Section p n '

RI Resident Office e : ,1 <

, c Licensoo:

(Reactor Licensees)

Region I Form 83 (Rev. July 1986) i 1

323 fib 3070310 PNO-I-07 022 pon  !

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