ML20151X631

PNO-77-124:on 770710,Commonwealth Edison Reported That Unit 2 Reactor Scram Occurred Due to 2C SG Low Level Condition. Condition Caused by Loss of Feedwater Pump While Performing Maint on Feedwater Pump Lube Oil Filter Sys

ML20151X631
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	07/11/1977
From:	Constable G, Sniezek J, Whitt K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-124, NUDOCS 9809170187
Download: ML20151X631 (1)

Text

ext mu ARY NOIIFICATION July .11,1977 SQ hCk@h PRELIMINARY NOTIFICATION OF EVENT OR UN This preliminary notification constitutes EARLY notice of an hven U POSSIBLE safety or public interest significance. The information presented is as initially rechived without verification or evaluation and is basically all that is known by IE staf f on this dste. ~

Pacility:

Commonwealth Zion, IL Edison Company, Zion Unit 2 (Docket No. 50-304),

, _Subj ec t : ~

. STEAM GENERATOR WATER HAMMER -

Commonwealth Edison Company reported that at 11:22 a.m. on July 10, 1977 a Unit 2 reactor scram occurred due to a 2C steam generator low-low level condition. This condition was caused by the loss of a feedwater pump system.while performing maintenance on the feedwater pump lube oil filter During recovery of the steam generator water level, a steam generator water hammer occurred. The water hammer in turn, caused a disturbance safety system of injection.

feedwa'ter flow transmitters on loop A resulting in a l

Visual examination of the feedwater lines and steam flow by members of the plant review' committee showed no pipe support damages and no insula-tion disturbance.

in B loop and one in D loop were found to be cracked.However, The plant is one feedw still shut down for further evaluation of damage. A RIII (Chicago) inspector is at the site reviewing this matter. .

gg -

Ne'ither the Release licensee at this time. or RIII have decided on the issuance of a Press

' / -

The State of Illinois has been notified.

RIII (Chicago) office received notification of this occurrenca by telephone from a member of the plant staff at 7:44 p.m. on July 10,

'1977.

This information is current as of 0830 on July 11, 1977.

Contact:

KWhitt, IE x27451 GLConstable, IE x27451 JHSniezek, IE x27451 Distribution: Transmitted H St /.*4 / /W C. C. IGtmmerer, CA G. F. Murphy, JCAE Commissioner Kennedy S. J. Chilk, SECY Commissioner Gilinsky H. H. Whitesides SCNR H. R. Myers, HCEE Transmitted: MNBBj.*d P Bldg /.* 8 L. V. Gossick, EDO E. G. Case, NRR SS Bids ///!

S. H. Hanauer, EDO C. V. Sdith, NMSS J. A. Harris, PA W. G. Mcdonald, MIPC Luge (MAIL)

R. G. Ryan, OSP E. Volgenau, IE H. K. Shapar, ELD T. J. McTiernr.n, OIA Region 8 _ff/ M w __ ' '

. PRELIMINARY NOTIFICATION A-i j

9809170187 770711 PDR I&cE 4X D)D PNO-77-124 PDR O

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