ML18348A276

License Event Report 1976-036-00 Re Containment Air Locks

ML18348A276
Person / Time
Site:	Palisades
Issue date:	11/19/1976
From:	Bixel D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-036-00
Download: ML18348A276 (3)

Text

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consumers

• Power company General Offices: 212 West Michigan Avenue, .Jackson, Michigan 49201

• Area Code 517 788-0550 November 19, 1976 Mr James G Keppler Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255, LICENSE DPR

• PALISADES PLANT - ER-76 CONTAINMENT AIR LOCKS Attached is an event report which relates to the Palisades Plant. This event concerns leakage problems which were encountered during testing or inspection of the personnel and escape air locks.

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David A Bixel Assistant Nuclear Licensing Administrator NOV 2 3 1976

. .ICENSEE EVENT REPORT PALISADES PLANT CONTROL BLOCK:!1__ I I I I I

....___.~.._....__,,~6 (PLEASE PRINT ALL REQUIRED INFORMATDON]

LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE IMII IPIAILl1 I _10101-10101010101-10101 14111111111 I0 11 1 7 8 9 14 15 25 26 30 31 32 REPORT -REPORT TYPE. . SOURCE

• OOCKl;T NUMBER .. EVENT DATE REPORT DATE

° I 2 I 5 I 568*I 1691 11 1°1 5 17 1 6741 1111111917161

@IT]coN'T I* I* I l..:EJ W 'I o I 5 I 0 1-1 7 8 57 58 59 60 61 75 80 EVENT DESCRIPTION lol2I !During routine testing and investigation of containment penetrations, air leakage I 7 8 9 . 80 lol3I I was observed during both the testing of the escape and personnel air locks. Also, I 7 8 9 80 lol41 I as part of these tests, procedures were not properly followed and no as found I 7 8 9 80 lol5l I leakage measurements were taken. The leakage problems have been corrected and I 7 8 9 80 lol61 I remedial action with respect to failure to follow procedures has been (See Line 18) I 7 8 9 PANE 80 SYSTEM CAUSE COMPONENT COMPONENT 7

@El Isl Al 8 9 COOE 10 w

CODE 11 COMPONENT CODE IPIEINIEITIRI 12 17 SUPPLIER LU 43 44 MANUFACTURER I wI 3 Io I 2 I 47 VIOLATION w48 CAUSE DESCRIPTION Iola! I See attached sheet. I 7 8 9 80

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~9~~_,.~~~~~~__,,__,,~__,,~__,,__,,~__,,__,,~~__,,_,.__,,__,,__,,~__,,__,,__,,__,,__,,~__,,_,.__,,_....~__,,__,,~a-'o 80 FACILITY METHOD OF

% POWER OTHER STATUS. DISCOVERY DISCOVERY DESCRIPTION w w STATUS EEi8 11 Io I oI NA I NA 7 9 10 12 13 44 45 46 80 FORM OF ACTIVITY CONTENT rn RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE W ~ . . _ I_ _ _..N..._A.....__ ___.I NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCR_IPTION

[IEJ lololol l&J ~----------N_A__,....___________________________________.

7 8 9 11 12 13 80 PERS'ONNEl INJURIES NUMBER DESCRIPTION l2E I 0I 0 I 0 I . NA 7 8 9 11 12 ' 80 PROBABLE CONSEQUENCES rn I None.

7 8 9 A redundant door was operating satisfactorily.

80 LOSS OR DAMAGE TO FACILITY TYPE OESCAIPTIO,N 7

~-8 liJ 9 10 NA BD PUBLICITY

[ill] None.

7 9,9 80

- ADDITIONAL FACTORS WJ I taken. Retestjp~ of' the lock was satisfactorily conducted. (ER-76-36) 7 8 9 80 GE8 9 7 80

• LICENSEE EVENT REPORT ER-76-36 Palisades Escape Lock During an investigation 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 "closed." Investigation revealed that with the normal containment pressure (approximately 2 psig), and wi:Gh 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 loGk was pressurized 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 determined. Action to correct this has been taken .