ML20207G586

PNO-77-201:on 771116,urgent Failure Alarm Occurred on Rod Control Sys,Indicating Logic Problem in CRD Sys.Reactor Shutdown from 100 Percent Power to Cold Shutdown Condition commenced.In-motion of Control Rods Determined Operable

ML20207G586
Person / Time
Site:	Ginna
Issue date:	11/17/1977
From:	Klingler G, Nolan F, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-201, NUDOCS 9903120119
Download: ML20207G586 (1)

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Pp p d WJ Gr m :1Yf PREL'IMINARY NOTIFICATION

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b flovember 17, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UN

--PNO-77-201 T03SI3LE safety ur public interest sionificance.Th n event of presented is as initially received without verification or eval _ t The information and is basically all that is known by IE staff on this date ua on

'.Facility:

Rochester Gas and Electric Corporation -

R. E. Ginna (DN 50-244)

Ontario, New York

Subject:

UNPLANNED SHUTDOWN OF FACILITY DU i

CONTROL SYSTEM i

At 1:45 PM, November 16,197'/, an urgent failure alarm oc Rod Control System.

rod drive system and it outomatically inhibits rod out m curred on the In acccroance with facility procedures reactor shutdown fro powr. to the cold shutdown condition was commenced.

m 100 percent 1".-motion of each group of control rods was demonstrated t In addition, the The rod scram feature is not affected.

o be operable.

The length of the shutdown to diagnose and correct the probl known at this time.

em is not shutdown of nuclear facilities. Media interest is expected bec a

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anned A press release is not planned by the licensee or NRCThe State of !!e NRC, Region I (Philadelphia) received notification of this from the Plant Superintendent at 3:30 PM, November 16 occurrence

, 1977.

Contact:

GX1fngler, IE x20019 FUolan, IE x28019 Distribution:

JSniezek, IE x28019 Chairman'He'ndrie Transmitted H St 9'flo Commissioner Kennedy Commissioner Bradford Commissioner Gilinsky S. J. Chilk, S.ECY C. C. Kammerer, CA (ForDistribution)

Transmitted: MNBB 3 lff[

P Bldg /d'N L. V. Gossick EDO S. H. Hanauer., EDO E. G. Case, NRR E. Volgenau IE J. J. Fouchard, PA Regionf,_, ///J [

W. G. Mcdonald, MIPC SS Bldg /4.'d D (MAIL Dj R. G. Ryan, OSP C. V. Smith, Mt!SS R'~T)McTiernan, OIA /

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H. K. Shapar, ELD R. Minogue, SD v

g PRELIMIt!ARY MOTIFICATION i

i 9903120119 771117 1

-7 201 PDR 1

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