ML20005A872

LER 81-005/01T-0:on 810222,low Power Injection Check Valve Discovered Leaking Excessively During Intersystem LOCA Leak Test.Caused by Buildup of Crud in Pivot Gap Area.Disc Hinge & Hinge Pin Replaced.Crud to Be Analyzed

ML20005A872
Person / Time
Site:	Oconee
Issue date:	03/09/1981
From:	Philpott F DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A868	List: ML20005A867 ML20005A872
References
LER-81-005-01T, LER-81-5-1T, NUDOCS 8107010413
Download: ML20005A872 (1)

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i. is .ercar9ura l 81 1l@ se avant casenimon Arso emosasta conssouaNCs3 h DETTI I LPI check valve 1.CF-12 was discovered to be leaking excessively during l ITTT1 I performance af intersystem LOCA Leak test. Backup check valves in same LPI g g i loop were leak tested and showed no leakage. In addition, motor operated Ie isi i valve in same-LPI. loop was:in.its normal closed. position. Valve l' CF-12 j-pi ,. i i rcmained capable of opening fully under LPI flow. Thus, isolation of RCS pre ,

I o ; 7 I I ssure from low pressure section of LPI system was assured, and full LPI flow g ITTM I throuch the valve could be obtained if needed. t E E s5 nee consenswrence su 7.cy,.

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Ii 6 o 1 I Leakage appears to have resulted from the buildup of crud in the pivot gap ,

Ii ii i I area where the disc is connected to the hinde arm, which froze the disc in a ,

m I cocked oosition and prevented ~it from seating properly. Some galling may also,.

gI have oc. curred. Disc,. hinge, and hinge pin were replaced. Crud to be ,

ii ,.iI analyzed to determine origin. ,

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