ML19296B931

LER 80-002/03L-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

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: ML19296B918 ML19296B931
References
LER-80-002-03L-01, LER-80-2-3L-1, NUDOCS 8002220383
Download: ML19296B931 (2)

Text

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

- LICENSEE EVENT REPORT CONTROL BLOCK: l I

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(PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) o 1 8 9 ll lLlQ A l D l 214 l@l 15 0l 0 0l -lLICENSE 0l 0l 0 l -l 0 0 l 025l@l264 l IUCENSE NUMBER l1l1 l 1 l@l57 CAT TYPE JO l

58 7 LICENSEE CODE CON'T E l 8 8l0l@ 0I?REPORT lo l7DATEl4 ln80@

7 8 so0,$ l L }@l 0 60 61 5 l0DOCKET l0 10 NUMSER l2 l6 l 568l@l69 0 l EVENT 1 l 0OATE 74 75 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h Ml While leak testina the RHR service water vault nenetratinns- nencedure nT9 inn-11 a l ml small amount of leakage was observed from electrical penetration P-12. The test l o 4 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. l o 8i !

80 7 8 9 CE CODE SU8CO E COMPONENT CODE SUSCOD'E S E 7

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CAUSE OESCRIPTION AND CORRECTIVE ACTIONS i O l The hold-down bolts which compress the rubber seal were loose. This condit i on l i i l allowed air to leak through the seal. Corrective action was to tighten the I

, , j hold-down bolts. The penetration was retested satisfactorily. l i 3 1 1 i 4 I I

7 8 9 80 ST S  % POWER OTHER STATUS Dis O RY DISCOVERY DESCRIPTION y Hl@ l0l0l0l@l NA l l Bl@l Routine Test l ACTIVITY CONTENT RELE ASED OP RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 7

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PERSONNEL EXPOSUR(3 NUV8fR TYPE DESCRIPTION A l0l0l0j@ g @l NA l PERSONNE t INJURtES NUV8ER DESCRIPTION -

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7 8 9 to 40 2 o lN ISSUEf@lDESCntPTION ilA l llllllllllll 1 7 3 3 10 68 69 80. s NAP,1E OF PREPARER PHONE: ,

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l. 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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