PNO-I-87-072, on 870730,reactor Scrammed Due to Low Reactor Vessel Water Level After Power Lost to Reactor Feedwater Control Circuit.Caused by Failed Transfer Circuit to Instrumentation Inverter.Investigation Continuing

PNO-I-87-072:on 870730,reactor Scrammed Due to Low Reactor Vessel Water Level After Power Lost to Reactor Feedwater Control Circuit.Caused by Failed Transfer Circuit to Instrumentation Inverter.Investigation Continuing

ML20236F702
Person / Time
Site:	Hope Creek
Issue date:	07/30/1987
From:	Borchardt R, Swetland P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-87-072, PNO-I-87-72, NUDOCS 8708040005
Download: ML20236F702 (1)

DCS No: 50356870730  !

Date: July 30, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-87-72 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety 1 or public interest significance. The information is as initially received without 3 verification or evaluation, and is basically all that is known by the Region I  !

. staff on this date.

Facility: Licensee Emergency Classification:

Public Service Electric X Notification of Unusual Event and Gas Company ~ Alert Hope Creek Site Area Emergency  !

Hancocks Bridge, NJ General Emergency Docket No. 50-354 Not Applicable l

Subject:

REACTOR SHUTDOWN At 9:10 a.m. on July 30, the Hope Creek reactor scrammed due to Low Reactor Vessel water level, after power was lost to the reactor feedwater control circuit. During the transfer of power supplies to an instrumentation inverter, the transfer circuit l apparently failad, deenergizing the Teedwater circuit. The high pressure. coolant l

injection and reactor core isolation cooling systeras both automatically started and injected into the vessel until secured by the operators. All plant safety systems responded as designed. As of 10:00 a.m., July 30, reactor. vessel level is steady at 35 l inches and the unit is in hot shutdown. The licensee declared an Unusual Event from 9:26 a.m. to 9:27 a.m. in accordance with the site Emergency Plan. The licensee plans to return t) power immediately after investigation and correction of the cause of the inverter pr>blem, and completing the required surveillance tests.

The resident inspectors are onsite, following the licensee's actions.

This notification is for information only.

i The States of New Jersey and Delaware have been notified.

i CONTACT: R. Borchardt P. Swetland l 609-935-5151 488-1114 DISTRIBUTION:

1 H. St. MNBB Phillips E/W Willste Mail: ADM:DMB l Chairman Zech EDO NRR NMSS DOT:Trans only 1 Comm. Bernthal PA OIA RES Comm. Roberts OGC AEOD NRC Ops Crt 4 i Comm. Carr \

u l ACRS Air Rights INPO---- i SECY SP NSAC---- I CA PDR Regional Offices TMI Resident Section '

RI Resident Office Licensee:

(Reactor Licensees)

Region I Form 83 (Rev. July 1937) G60 9708040005 870730 - '

j PDR PND-I-87-072 I&E PDR f'

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