ML17326A282

LER 79-031/03L-0:on 790912,elevation Containmment Airlock Interlock at 612 Ft Did Not Prevent Opening of Outer Door W/Inner Door Open.Caused by Flexing of One Interlock Support Bracket.Gusset Added to Bracket

ML17326A282
Person / Time
Site:	Cook
Issue date:	10/10/1979
From:	Michael Brown INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A281	List: ML17326A280 ML17326A282 ML17326A284
References
LER-79-031-03L-01, LER-79-31-3L-1, NUDOCS 7910160506
Download: ML17326A282 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

{7.77)

ICENSEE EVENT REPORT CONTROL BLOCK: Q1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

~o1 M I D C C 2 Q2 0 0 p p p p p p p Qo 0 y i i i30 Q4~QE 57 CAT 58 7 8 9 LICENSEE'CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE CON'T

~01 0 5 0 0 0 3 1 6 07 0 9 2 7 9 QS 1 0 1 0 7 9 QB soURGE LLJQB 69 EVENT DATE 74 75 REPORT DATE 80 7 8 60 61 DOCKET NIJM9ER 68 EVENT DESCRIPTION AND PROBABI.E CONSEQUENCES +10 WHILE PERFORMING STP.010'HE 61'LEVATION CONTAINMENT AIRLOCK INTERLOCK DID NOT PREVENT THE OPENING OF THE OUTER DOOR WITH THE INNER DOOR OPEN.

~O3

~04 THIS OCCURRED ON BOTH 9-11-79 AND 9-12-79, CONSTITUTING AN INOPERABLE

~OS AIRLOCK PER TECH. SPEC. 3.6.1.3. AT LEAST ONE DOOR REMAINED SHUT PER ACTION ITEM. PUBLIC HEALTH AND SAFETY WERE NOT JEOPARDIZED. SIMILAR

~OB EVENTS: 78-014/03L-0; 78-066/03L-Op 79-016/03L-0 p AND DOCKET 050-315

~OS 79-004/03L-O.

80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 7E Q>> B Q72 ~BQ13 P E N E T R Q4 ~EE Q75 ~ZQ75 8 9 10 11 12 13 18 19 20 7

SEQUENTIAL OCCURRENCE REPORT R EV IS I ON QlL LERIRO REpoRT ACTION FUTURE EVENT YEAR

~79 21 22 EFFECT

~

23 SHUTDOWN

~03 24 REPORT NO.

1 26

~W 27

~03 28 ATTACHMENT CODE 29 NPRDP TYPE

~L 30 PRIME COMP.

31 NO.

0 COMPONENT TAKEN ACTION ON PLANT METHOD HOURS +22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER o' w w 3 o 2

~B(p~EQER ~EQER ~ZQ24 o ~NQ23 ~NQ24 ~NQ25 QE 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 0 ~ THE CAUSE OF FAILURE WAS FOUND TO BE ONE INTERLOCK SUPPORT BRACKETS W J'OOLEY DETAIL 30234-6, WAS 11FLEXINGIIi PREVENTING THE INTERLOCK SIGNAL 1

FROM ENGAGING THE INTERLOCK PAWL. A GUSSET WAS ADDED TO THE BRACKET AND TESTED SATISFACTORILY. A LONGER TRAVEL DRIVE SPRING WILL BE ADDED-TO 3

IMPROVE THE OVERALL PERFORMANCE OF THE MECHANISM.

7 8 9 80 FACILITY METHOD OF QBO DISCOVERY DISCOVERY DESCRIPTION Q32 5

8 STATUS 9

~E QEE ~0QR 10

% POWER 12 13 OTHER STATUS 44 45 Q31 46 SURVEILLANCE TESTING 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY LOCATION OF RELEASE Q 7

6 8 9 Z Q33 10 Z

Q NA 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39 7 ~00 0 Q37 ~Q38 NA 80 7 8 9 11 12 13 PERSONNEL INJURIES 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY DESCRIPTION Q43 TYPE Z Q42 NA 8 9 10 80 PUBLICITY NRC USE ONLY 7 8 9 10 68 69 80' M. S. BROWN (616) 465-5901 EXT.'98 a NAME OF PREPARER PHONE:

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