05000321/LER-1978-008-01, /01T-0 on 780209:during Steady State Power Operation,Test Valve Found to Be Broken Off.Cause Unknown. Valve Repaired.Investigation Under Way

/01T-0 on 780209:during Steady State Power Operation,Test Valve Found to Be Broken Off.Cause Unknown. Valve Repaired.Investigation Under Way

ML19241A977
Person / Time
Site:	Hatch
Issue date:	02/24/1978
From:	Thomas Greene GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19241A968	List: 05000321/LER-1978-008, Forwards LER 78-008/01T-0 05000321/LER-1978-008-01, /01T-0 on 780209:during Steady State Power Operation,Test Valve Found to Be Broken Off.Cause Unknown. Valve Repaired.Investigation Under Way 05000321/LER-1978-085, Notifies That LER 78-085 Has Been Voided ML19241A967
References
LER-78-008-01T, LER-78-8-1T, NUDOCS 7907110485
Download: ML19241A977 (2)

LER-1978-008, /01T-0 on 780209:during Steady State Power Operation,Test Valve Found to Be Broken Off.Cause Unknown. Valve Repaired.Investigation Under Way

Event date:
Report date:
3211978008R01 - NRC Website

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g lDuring steady state power operation, while preparing to perform a local lt eak rate test on an electrical penetration per Tech Spec. 4.7.A.2.e., a o 3

[ TIT)l test valve was found to be broken off.

This did not constitute a violata g of pri=ary containment integrity since sufficient isolation of the pri=ar-o e containment was =aintained.

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NARRATIVE

REPORT LER 78 - 08 While preparing to perform a local leak rate test, per Tech Specs Section 4.7.A.-

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on electrical penetration X-202, a technician discovered the valve used for testing or filling the penetration with nitrogen, broken. This resulted in the electrical penetration losing the nitrogen pressure that maintains an inert at-mosphere for the associated cables. This did not constitute a violation of primary containment integrity due to the redundancy of the recessed pressure headers in the penetra'. ion canister.

Penetration X-202 is a torus low voltage power penetration designed for power ap-plications up to 600 volts.

Following the discovery, the test valve was repaired and a local leak rate test was performed on the penetration with the results in-dicating zero leakage.

Investigation will be made to determine the necessity and extent of any further corrective action in an effort to preclude recurrence of this event and to deter-mine what, if any, cable degradation occurred due to the loss of nitrogen.

An update report will be submitted to document any further corrective action.

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