ML19305A412

LER 79-008/03L-0 on 790310:during Refueling Frequency Local Leak Rate Test,Excessive Leakage Noted Across Valve AH-V1B. Caused by Loose Valve Seat Retaining Screws in Valve.Screws Tightened & Valve Tested Satisfactorily

ML19305A412
Person / Time
Site:	Three Mile Island
Issue date:	04/26/1979
From:	Stanley W METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305A411	List: ML19305A410 ML19305A412
References
LER-79-008-03L-01, LER-79-8-3L-1, NUDOCS 7905080451
Download: ML19305A412 (1)

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EVENT % 4CRIPT10N AND PROBABLE CONSEQUENCES h l o l 21 l During refueling frequency local leak rate testing, excessive leakage l 10lal l across valve AH-VlB caused a violation of T.S. 4.4.1.2.3 criteria, which  ;

goil l 1s reportable per T.S. 6.9.2.B. (2) . The unit was shut down for. refueling l l o ; s ; ; at the time and the redundant valve AH-VlA was operable and satisfactorily l 10 ls l l tested as found. This event, therefore, had no adverse effect on the  ;

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40 lN lg lN lg l A lg lP l3 l4 l0 lg el 4; 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li t o g l The leakt.ge across AH-V-1B was apparently caused by loose valve seat l

[i ii ; l retaining screws. Prate Model RlA. 48" 125# Butterfly w/Limitorque opetator.  !

4 , , ;, , g Seat screws were tightened and valve satisfactorily tested. AH-V1B seat I g,g3, I leakage will be rechecked f ollowing TMI-l Cycle 5 startup and again following first l

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NAME OF PREPARER W. S. Stanley PHONE: (215)-921-6587