ML19347B091

LER 80-064/03L-0:on 800829,reactor Bldg Airlock Doors Were Momentarily Opened Due to Failure of Electrical Interlock. Caused by Defective Microswitches Which Actuate Door Interlocks.Microswitches Replaced

ML19347B091
Person / Time
Site:	Pilgrim
Issue date:	09/29/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347B090	List: ML19347B088 ML19347B091
References
LER-80-064-03L, LER-80-64-3L, NUDOCS 8010010511
Download: ML19347B091 (1)

Text

_ _ _ . ._ _ _ _ - _ __-_________

LICENSEE EVENT REPORT CONTEOL BLOCK: l 1

l l l l I lh (PLEASE PRINT O.'l TYPE ALL REQUIRED INFORMATION)

IO l1J IM I tiCENSEE A lP lP lS l 1l@l 0 l 0 l - l 0 l uCENSE 0 l 0 NUMSER l 0 l0 l- l 0 l 0 l@l 426 l 1 UCENSE l 1 1 1TYPE l l 140l@l57 GAT 54 l@ ,

7 _8,9 COCE 14 15 25 cot!?T l,0 W [u'RCs l L @l 0 } 5OOCKET l 0 NUMOEM l - 10 l 219 l3 @l0 18 12 l9-l8 l0 @l0I9l2I91810l@

• 8 60 61 68 69 EVENT CATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES h Iol2l l On August 29, 1980 at approximately 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, the Reactor Building Airlock doors l l o 13 l l were both momentarily opened due to failure of their electrical interlock. A guard l

. i o ,,, , l was i= mediately stationed at the reactor door to prevent simultaneous opening of these ;

i lois1l airlock doors. The interlock was repaired and returned to service on September 11,19803 lo l6 l l l Lo l i l 1 I 10181 l l 7 8 9 60

$0$E 00 su$CNE COMPONENT CODE sus COE $U [OCE

oisi 'lI l El@ l E l@ l A l@ l P l E l N l E l T l R l@ lA j@ l Zl@

8 9 10 11 12 13 18 19 20

. $EQUENTIAL OCCURRENCE REPORT REVISION LER EVENT YEAR REPORT NO. CODE TYPE N O.

@ gug/Ro l8l0l aE l-l l Ol 6l 4l l/l 1013 l lLl l-l l0]

21 22 23 24 26 27 28 29 30 31 J2 7K N AC O O P NT M MOURS SS i POR B. Sb UE MANUF RER l33B l@l34F l@ lZl@

35 l36Z l@ Lolofofo'l 31 40 lelN l@ l42N l@ lN 43 l@ lG l 44 I8l0l@. 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o ; l A maintenance request was issued and defective microswitches which actuate the door  !

g Linterlocks replaced. A review of interlocks circuitry has been initiated. Presentiv, !

,,,,,l indication and operation of the electrical interlocks are subjected to common mode i

,,;3, l failure. A design change is being investigated to eliminate this condition. l 1i1s1 I I sTEE  % POwsm o, 4ER STATUS I CO ERY OISCOVERY OESCRIPTION Operational Event

-l115 l l El@ l 0 l 9 l 8 l@l J.A. l W @l l AbVITY CO TENT r,ELEASED OP RELEASE AMOUNT OP ACTIVITY LOCATION OP RELEASE QW J @ lZl@l '

N.A.

l l N.A.

l PERSONNEL ExPosuEEs NUMSER TYPE DESCRIPTION l 117 l l0 l0 l 0 l@l Z l@l N.A. l PERscNNe'L iN;UliEs

' 13 80 NUMeER CEsCRiPriON 1118 l l0 l0 l0 lhl N.A. l 7 8 9 11 12 -

80 LCS5 OP OR CAMAGE TO PACIUTY TY'E DESCRIPTION Q d@l 7 8 9 to N.A.

80 l

"" "S" ""

g issuf@*o'E7CmPTiON l

80100105//*- @ N.A. l lllllllll1ll lf 7 8 9 10 68 69 80 3 ,

617-746-7900 NAME OF PREPARER M. Omas M oug M n PHONE: {