ML17317B118

LER 79-011/03L-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

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: ML17317B116 ML17317B118
References
LER-79-011-03L-01, LER-79-11-3L-1, NUDOCS 7904240414
Download: ML17317B118 (3)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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ICENSEE fVENT REPORT IPLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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CONTROL BLOCK: Q1 I 6

[os 7 8 9 M I D LICENSEE CODE C C 2Q20 14 15 LICENSE NUMBER 0

25 26 LICENSE TYPE I I 30 Qo~ 57 CAT 58 Qo CON'T

~o ~LQB 0 5 0 0 0 3 1 6Q7 0 3 2 7 7 9QB 0 4 QB 7 8 60 o 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 DURING A SURVEILLANCE TEST ON THE LOWER CONTAINMENT AIR LOCK THE OUTER D R SEAL LEAKAGE WAS FOUND TO BE 458 SCCM. THIS EXCEEDED THE LIMIT OF .0005 L SCCM

~O4 AS SPECIFIED BY T.S. 4.6.1.3.b. PREVIOUS OCCURRENCES INCLUDE: 315 78-23 37'43 t pe 316/78-82.

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~os 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 0>> I Q>> LJQ>> E " E T R Q4 ~AQio ~ZQlo 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

LER(RP Pn oooo'1 28 29 30 31 32 22 23 24 26 27 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER MBQ&ZQlo 33 34 MZQoo 35

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36 37 0 0 0 40

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42 IQo4 ~AS 43 44 W 3 0 E 47 Qoo CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o INVESTIGATION REVEALED THAT THE SEAL ON A TEST LINE ENTERING BETWEEN THE AIR LOCK DOOR SEALS WAS LOOSENED DURING THE INSTALLATION OF A SECURITY GATE AT THE AIR LOCK ENTRANCE. THIS GATE WAS INSTALLED DURING THE FIRST WEEK OF JANUARY OF THIS YEAR BY CONSTRUCTION PERSONNEL. APPARENTLY, WHILE INSTALLING THE 3

FRAMEWORK FOR THE NEW SECURITY GATE A SIZEABLE AMOUNT OF FORCE (SEE SUPPLEMENT) 4 80 7 8 9 FACILITY STATUS

'3Q  % POWER OTHER STATUS ~

~3P METHOD OF DISCOVERY SURVEILLANCE TEST DISCOVERY DESCRIPTION Q32 CO o 8 9 E Qoo 10 0

12 Qoo 13 NA 44

~BQoi 45 46 80 ACTIVITY CONTENT OF RELEASE AMOUNTOF ACTIVITY Q LOCATION OF RELEASE OZa8RELEASED 7

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Q33 WZQ34 10 11 NA 44 45 80 g yC3 '(2-'(0 PERSONNEL EXPOSURES Y ( V 7 8 9 11 12 13 80 PERSONNEL INJURIES a ~0~ 0 Qoo NA 80 7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY ~43 7 8 TYJE 9

'Q DESCRIPTION 10 NA 80 PUBLICITY NRC USE ONLY ISSUED DESCRIPTION ~4 oo O

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J. L. Rischling 616-465-5901 L NAIVIE OF PREPARER 0

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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