ML20207H074

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PNO-77-208:on771120,plant Shut Down Due to Anomalous Rc Pump Instrumentation Condition Caused by Low conductor-to- Conductor Resistances within Containment Electrical Penetration Assembly.Ials Issued on 771104 & 771108 by NRC
ML20207H074
Person / Time
Site: Millstone 
Issue date: 11/21/1977
From: Klingler G, Nolan F, Sniezek J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-208, NUDOCS 9903120236
Download: ML20207H074 (1)


Text

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'RELIMINARY NOTIFICATION

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November 21, 1977 PRELIti! NARY NOTIFICATION OF EVENT OR UNUSUA POSSI3LE saTety or oublic interest significance.This are The information presented is as initially received without verification or evaluation a_nd is basically all that is known by IE staff on this date.

Facility:

Northeast fluclear Energy Company Millstone Point Unit 2 Materford, Connecticut (DN50-336)

Subject:

ANOMALOUS COTIDITION RELATED TO DEGRADED PENETRATION CONDUCTER RESISTANCES The plant was shut down ca November 20, 1977, due to an anomalous reactor resistances within a containment electrical penetr were no degraded safety conditions as a result of the instrumentation There anomaly nor were there any releases of radioactivity or personnel injurie As a result of previous electrical resistance pr'oblems 'n these penetr assemblies. Immediate Action Letters were issued to the licensee by NR Region I on November 4 and 8, 1977.

veillances of these assemblies, the letters required (1) a plant sh if further anomalous conditions occurred, and (2) ?!RC approval prior to restarting the plant.

~ The licensee plans to commence the initial refueling.ectivities which gg were,orininally sche'duled to begin' December 3,1977.

scheduled for the refueling shutdown are expected to last 9 weeks.l activities The criaina j

present penetration assembly problem may extend the outage, The i

problems at Millstone Point Station. Media interest is expected be informed.

The State of Connecticut has been anomalous condition and refueling shutdown.A press release is pl Region I is considering a press release.

NRC, Region I, (Philadelphia) received notification of this occurrence by telephone from the Unit Superintendent at 11:30 a.m., November 20, 1977.,

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Contact:

GKlingler, IE x28019 FNolan, IE x28019 JSniezek, IE x28019{,d 5

Dis t'r'ibution:

Transmitted H St //*

O Chairman Hendrie Commissioner Bradford

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R Commissioner Kennedy S. J. Chilk, SECY C. C. Kammerer, CA 1

Commissioner Gilinsky/. M Transmitted: tiNBB /

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