05000316/LER-1979-011-03, /03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested

/03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested

ML17317B118
Person / Time
Site:	Cook
Issue date:	04/17/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B117	List: 05000316/LER-1979-011, Forwards LER 79-011/03L-0 05000316/LER-1979-011-03, /03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested
References
LER-79-011-03L-01, LER-79-11-3L-1, NUDOCS 7904240414
Download: ML17317B118 (3)

LER-1979-011, /03L-0 on 790327:outer Door Seal of Lower Containment Air Lock Found Leaking.Caused by Force Placed on Seal During Installation of Security Gate at Air Lock Entrance.Seal Tightened & Outer Seal Retested

Event date:
Report date:
3161979011R03 - NRC Website

text

U. S. NUCLEAR REGULATORYCOMMISSION ICENSEE fVENT REPORT Q1 IPLEASE PRINT OR TYPE ALLREQUIRED INFORMATION) 6 0 Q'>>

I I Qo~ Qo LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 NRC FORM 366

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61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 DURING A SURVEILLANCE TEST ON THE LOWER CONTAINMENT AIR LOCK THE OUTER D

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8 SEAL LEAKAGE WAS FOUND TO BE 458 SCCM.

THIS EXCEEDED THE LIMIT OF.0005 L

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PREVIOUS OCCURRENCES INCLUDE: 315 78-23 37'43 316/78-82.

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8 LOCK DOOR SEALS WAS LOOSENED DURING THE INSTALLATION OF A SECURITY GATE AT THE 9

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INVESTIGATION REVEALED THAT THE SEAL ON A TEST LINE ENTERING BETWEEN THE AIR AIR LOCK ENTRANCE.

THIS GATE WAS INSTALLED DURING THE FIRST WEEK OF JANUARY 3

4 OF THIS YEAR BY CONSTRUCTION PERSONNEL.

APPARENTLY, WHILE INSTALLING THE FRAMEWORK FOR THE NEW SECURITY GATE A SIZEABLE AMOUNT OF FORCE (SEE SUPPLEMENT)

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SUPPLEMENT'TO LER'f79-Oll/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION WAS PLACED ON THIS PIPE LOOSENING THE PIPE SEAL.

THE ROUTINE SURVEILLANCE CHECKS OF THE AIR LOCK, AS REQUIRED BY T.S. 4.6.1.3.a WERE COMPLETED AS REQUIRED WITH NO DISCREPANCIES.

ONLY THE MORE SENSITIVE TESTING REQUIRED BY T.S, 4.6.1.3.b DETECTED THE EX-CESSIVE LEAKAGE.

THE PIPE SEAL WAS TIGHTENED AND THE OUTER DOOR SEAL WAS RETESTED WITH AN ACCEPTABLE LEAK RATE, THESE SECURITY GATE MODIFICATIONS HAVE BEEN COMPLETED ON ALL THE OTHER AIR LOCK ENTRANCES, AND ALL HAVE ADEQUATELY PASSED THE MORE SENSI'TIVE LEAK RATE TEST.

NO FURTHER ACTION IS PLANNED AT THIS