ML20085E459

LER ER-76-036:on 761105,air Leakage Noted During Escape & Personnel Air Lock Door Testing.Caused by Personnel Failure to Follow Procedures.Remedial Action Taken

ML20085E459
Person / Time
Site:	Palisades
Issue date:	11/19/1976
From:	Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-ER-76-036, LER-ER-76-36, NUDOCS 8308120071
Download: ML20085E459 (3)

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l UCENSEE EVENT REPORT PALISADES PLANT CONfROL BLOCK:l l l l l l l (pLgAeg PRINT ALL REGUMED INFORMATION)

. 1 8 UCENSE NUMSER TY toB l M l t l P l A l L l1 l 7 89 14 l 0 l 0 l-l0 l 0 l 0l 0l 0l-l 0 l 0 l l hl 1l1l 1l1l l0l1l 15 25 28 30 31 32 Ypf sYo E coCxET NUMSER EVENT C AEPORT DATE O CONT l

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• l 7 8 57 58 59 lLl 80 l0 l 5 l 0l-l 0 l2 l 5 l 5l 81 88 l1l1l0l$]Tl6l 89 74 l1l1l1l9l7l6l 75 80 EVENT DESCRPTION Q l During routine testing and investigation of containment penetrations, air leakage l 7 89 80 Q l vas observed during both the testing of the escate and personnel air locks. Also, l 7 89 80 HE l as cart of these tests, crocedures were not urocerly followed and no as found l 7 89 80 HE l leakage measurements were taken. The leakage problems have been corrected and l 7 89 80 DG l remedial action with resteet to failure to follow trecedures has been (See Line 18)l 7 89 m 80 "Eo"E C No*E CoupoNENT CooE E O vol.ATON 8 i si A l Ly] IP! rlN lE l Tla l l_A.,j A l Wl3 l0 l 2 l lNl 7 89 10 11 12 17 43 44 47 48 CAUSE DESCAPTON DE l See attached sheet. l 7 89 80 7

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l 89 80 3l l s  % POWER QTHER STATUS QVERY OtSCQVERY DESCRIPTON 8

7 8 W

9 1110 l 0 l l 10 12 13 NA l 44 l,d 45 l

48 NA 80 l

A D 0 0F LEASE AMOUNT OF ACTIVITY LOCATON OF AELEASE E Ld tz J l NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUM8ER TYPE OESCAlpTCN M l 0 l 010 l12 Wl13 7 89 11 NA l 80 PERSONNEL INJURIES NUM9ER CESCRIPTCN DE l 0 l 0 l 0 l l NA l 7 89 11 12 80 1

PROBABLE CONSEQUENCE 4 35 l None. A redundant door was oeerating satisfactorily. l l 7 89 80 l LOSS OR DAMAGE TO FAC:UTY TYPE DESCRIPTON i

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@ Lz_l 10l 7 89 NA l l

80 l PU8UCITY l M l None. l 7 89 80 ADDITONAL FACTORS l d l ta. .

7 89 c.t .s+ 4 w ee +he 'cek vas satisfactorily cenducted. (ER-76-36) l 8308120071 761119 80 l PDR ADOCK 05000255 1

D@ l S PDR

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l 7 89 80

b LICENSEE EVENT REPORT ER-76-36 Palisades Escape Lock During an f.nvestigation of the operation of the escape lock opening and closing mechanisms, the air lock inner door was observed to be incorrectly closing and that air was passing by the door when it was "clo_ sed." Investigation revealed that with the normal containment pressure (approximately 2 psig), and with the lock equalized to outside pressure, the door seating (latching) mechanism was not adjusted properly to prevent air from escaping by the inner door seal.

The door sealing mechanism was adjusted and an effective seal obtained.

The outer door was functioning properly at the time of this event and it is also considered likely that should an accident have occurred, any significant increase in containment pressure would have caused the inner door to seal.

Personnel Lock During the local leak testing of the personnel lock, leakage was identified when the lock was pressurize'd to about 20 psig. The lock was depressurized and the leak repaired. The leakage was through a shaft seal associated with the outer door locking mechanism. Retesting of the lock was satisfactory.

A review of this event disclosed that procedures were not followed properly in that an "as found leakage" was not deter =ined. Action to correct this has been taken, i

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s.n.r ome..: m2 w..: uienegen Avenv.. sac ==on. Micnigen 4920t e Ar.e Coc.517 788-C550 U Ll' ( i November 19, 1976 Mr James G Keppler Office of Inspection and Enforcement Region III US Nuclear Regulatory Co=nission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255, LICENSE DPR PALISADES PLANT - ER-76

• CONTAIIEENT AIR LOC:G Attached is an event report which relates to the Palisades Plent. This event concerns leakage problems which were encountered during testing or inspection of the personnel and escape air locks.

David A 31xel (Signed)

David A Bixel Assistant Nuclear Licensing Administrator bY i .li

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