05000269/LER-1981-005-01, /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

/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: 05000269/LER-1981-005, Forwards LER 81-005/01T-0.Detailed Event Analysis Encl 05000269/LER-1981-005-01, /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
References
LER-81-005-01T, LER-81-5-1T, NUDOCS 8107010413
Download: ML20005A872 (1)

LER-1981-005, /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

Event date:
Report date:
2691981005R01 - NRC Website

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.ercar ura 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.

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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.

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Disc,. hinge, and hinge pin were replaced. Crud to be ii,.iI analyzed to determine origin.

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