ML20197G378

Submits Daily Highlight.On 840421,seal Water Leak Identified in Reactor Main Coolant Pump.Licensee Expects Leakage Will Be self-sealing as Pressure Increases

ML20197G378
Person / Time
Site:	Diablo Canyon
Issue date:	04/23/1984
From:	Schierling H Office of Nuclear Reactor Regulation
To:	Case E, Harold Denton, Edison G NRC
Shared Package
ML20197G068	List: IA-86-744, Submits Daily Highlight.On 860930,util Commenced Unloading Spent Fuel from Unit 1 Into Original Racks,Reinstalled Into Unit 1 Pool.On 861001,fuel Assembly Element in Reactor Vessel Tipped Into Unloaded Assemblies.No Fuel Damage ML20197G063 ML20197G272 ML20197G348 ML20197G378 ML20197G383 ML20197G406 ML20197G411 ML20197H807 ML20197J383 ML20197J432 ML20198G046 ML20210U819 ML20211H655 ML20211N838 ML20214N656 ML20215D091 ML20215N496
References
FOIA-86-744 NUDOCS 8405150441
Download: ML20197G378 (3)

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Docket No.:

50-275 DISTRIBUTION N E3hu C Docket File 50-27 D m, system M.\\2S W LBf3 Reading MEMORANDUM FOR:

H. R. Denton HSchierling E. G. Case JLee G. Edison Attorney, OELD D. Eisenhut R. Purple H. Thompson R. Vollmer R. Mattson T.-Spis -

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J. Taylor G. Holohan T. Novak G. Lainas F. Miraglia THRU:

George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing FROM:

Hans Schierling, Project Manager Licensing Branch No. 3 Division of Licensing

SUBJECT:

DAILY HIGHLIGHT Diablo Canyon On early Saturday (April 21,1984) a seal water leak of approximately 2 gpm was identified at a reactor main coolant pump of Diablo Canyon Unit 1.

The reactor was in Mode 3 (Hot Standby) at about 900 psig and 430"F in preparation for criticality (Tech. Spec. allowable identified leakage is 10 gpm).

PG&E suspects that the leak is around an "0" rin and the seal package (see attached drawing)g seal between the RC pump housing

. On Sunday morning PG8E decided to cool the system down and replace the "0" ring seal.

PG8E expects the replacement to be completed late Tuesday and to go critical 2 to 3 ' days later.

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