05000265/LER-1980-002-03, /03L-0:on 800108,while Leak Testing RHR Svc Water Vault Penetrations,Observed Leakage from Electrical Penetration P-12.Caused by Loose hold-down bolts.Hold-down Bolts Tightened & Penetration Retested Satisfactorily

/03L-0:on 800108,while Leak Testing RHR Svc Water Vault Penetrations,Observed Leakage from Electrical Penetration P-12.Caused by Loose hold-down bolts.Hold-down Bolts Tightened & Penetration Retested Satisfactorily

ML19296B931
Person / Time
Site:	Quad Cities
Issue date:	02/07/1980
From:	Dunesia Clark COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19296B919	List: 05000265/LER-1980-002, Forwards LER 80-002/03L-0 05000265/LER-1980-002-03, /03L-0:on 800108,while Leak Testing RHR Svc Water Vault Penetrations,Observed Leakage from Electrical Penetration P-12.Caused by Loose hold-down bolts.Hold-down Bolts Tightened & Penetration Retested Satisfactorily
References
LER-80-002-03L-01, LER-80-2-3L-1, NUDOCS 8002220383
Download: ML19296B931 (2)

LER-1980-002, /03L-0:on 800108,while Leak Testing RHR Svc Water Vault Penetrations,Observed Leakage from Electrical Penetration P-12.Caused by Loose hold-down bolts.Hold-down Bolts Tightened & Penetration Retested Satisfactorily

Event date:
Report date:
2651980002R03 - NRC Website

text

NRC F043A 366 U.S. NUCLEAR REGULATORY COMMiss4ON (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l l lh (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION)

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60 61 DOCKET NUMSER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h l

Ml While leak testina the RHR service water vault nenetratinns-nencedure nT9 inn-11 a

ml small amount of leakage was observed from electrical penetration P-12.

The test l

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l was performed to comply with Technical Specification 4.5.H.I.a.

The penetration had l lo l@l been previously tested satisfactorily on June 28, 1979 The 2A RHR Service Water l

l O 16 l l Pump operability was not affected. All other vault penetrations were found to have l

0 7 l no Visible leakage.

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The hold-down bolts which compress the rubber seal were loose. This condit on l

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allowed air to leak through the seal. Corrective action was to tighten the I

hold-down bolts. The penetration was retested satisfactorily.

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LER NUMBER:

LER/R0 80-02/03L-0 ll.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill.

FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESIRIPTIO'N:

On January 8, 1980, while leak *esting the RHR service water vault penetrations, procedu QTS 100-33, penetration P-12 failed the leak test. The test was performed by pressurizing the penetration to 15 psig and checking for a,ir leaks with a soap bubble solution. This test was performed to comply with the surveillance requirements in Technical Specification 4.5.H.I.a.

A work request was written to repair the penetration.

P-12 is a new electrical penetration installed as part of Modification M-4-2-75-73 to install RHR Service Water Pump seal leak-off collectors and pumps. The penetration was leak tested satisfactory during the modification test performed on June 28, 1979 VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The erobable consequences of this occurrence were minimal.

The unit was shutdown, and there was no fuel in the reactor; therefore, the RHR service water system was not required to be operable. There were no high water problems in the condensate pit since the penetration was last inspected.

Had the 2A RHR service water pump been needed, it would have operated as designed.

Safe operation of the reactor was not affected as a result of this occurrence. All other vault penetrations were found to have no visible leakage when tested.

Vll.

CAUSE

The cause of this occurrence is attributed to equipment failure.

The hold-down bolts which compress the rubber seal were loose.

This condition caused air to leak through the rubber seal.

Vill.

CORRECTIVE ACTION

The corrective action was to tighten the hold-down bolts.

The penetration was retested; and no leaks were found.

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