ML20003F465

LER 81-010/03L-0:on 810322,during Power Operation,Field Breaker Failed to Open When B Rrmg Set Shut Down for Maint. Caused by Lack of Lubrication on Binding.Breaker AK-25 Lubricated

ML20003F465
Person / Time
Site:	Vermont Yankee
Issue date:	04/15/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003F464	List: ML20003F463 ML20003F465
References
LER-81-010-03L, LER-81-10-3L, NUDOCS 8104210310
Download: ML20003F465 (1)

Text

N " TQ C 064 U. S. NUCLEAR f EGULATORY COMMISSICN (V )

LICENSEE EVENT REPORT LER 81-10/3L CONTROL SLCCK: l i

I I I I l s

\h (PLEASE PRINT CA TYPt ALL REQUIRED INFORMATIONI lo f

i ts lvl Vl 6.CENsta Tl VI C;;t Yl Sl 1l@l010 l- 10 wCENatNLvesA to s l0101010 l- 1010 !@l264 l w;tNst ;5 11111l rvet 1l@l at

.0 57 l

sa @

l CC%'*

• C,"} l L@l01510 I010121711 a@l es01312 l 21811)@l0 a l 411151811 l@

losil g c 7 4 ea et cCCatTNLusta naNT C Aft 74 ateCav a Art e3 EVENT OESCRIP*10N AND #AC8 ABLE 00NSECUENCES h ioi2i I During ocwer coeration, when B RRMG Set was shut down for olanned maintenance, the I lai): I field breaker failed to ocen. This effectivelv disabled the recire numo trio I i losalI fantrunentation for "B" RR"C Set. T. S. Section 3. 2. I recuires that durine sove* l -

l o i s i I ooeration, the Recire Pump Trio Instrumentation be operable. There were no signifi-l laesiIcant occurrences ao a result of this event. nor were there any adverse affects to I l o i 7 4 l rublic honith cr enferv. All redundant avstens vere fully co e rable . There have I losii fkann an q u41nr eventa nrevfnusiv rener**d *n *ke c~~4sefon.  !

7 ep 83 sysTIM CAust CAust C OM *. VALvt C0ct C:ot susC ct CouPCNtNT : cot susCoct 10191 lI lB l@ y@ lB l@ lC lK lT lB (K lR l@ susCoce(A l@ W @

7 4 3 to 11 12 12 to is 20

. s t CU E NTI AL OCCURpthCt st*CRT REVis'CN (VINTvtAA atPORT NC. 00CE TvPt NO.

@ .,*Lla ,Eg;ao I8i1I l--J l 0I 11 of I/l 10 13 I lL I l--!_ Lo_1

_2i 22 22 24 ;6 27 23 29 2J 21 22 ACT1C N suryme t#ttCT s>UTOCWN ATTACwwtNT NeeCa amiut C up. COM8CNENT TAKEN ACT CN ON PLANT vtTMCO MCURs $UsuiTTis sC8M nLB. suP*u t4 UANL#ACTU8ta IBl@lxl@ I.s Z i@ Iz l@ l0 10 10 I I W@ I 2N l@ lNl@ lG l0 18 10 l@

.2 2

2. 2 .a .i 2 .7 CAusE OE3CPIPTICN ANO COARECTIVE ACTICNS @

l i 6 o l l The cause of the occurrence was binding in the operating mechanism of the breaha i liiii Idue to lack of lubrication. The breaker was lubricated and, af ter being eveled I

,ii7i I seversi times satisfactorily, was declared coerable. The breaker is a General Elec. I ii ,21lModel AK-25. These breakers will be added to the oreventative maintenance orocran. !

I litat i 7 8 9 so c

's't,ig,7  % ,e,,, c,,,,,,,,u,@ p,pOg,csv cas:cvtav cesCnieTicN @

li t5 l (,,v,,j @ l 0 I 9 l 7 l @ ln12aand Maint. l W @ lukr.fsfied to func. when REMr. ehutdevn83l 7 8 9 3 12 11 44 45 44 ACTivirr CO'NTENT etLIA$t: 8 #ELIAst AVCUNT CP ACT1vlTY

• LOCATICN Cp mtLEAst y g

l1 16 l l Z l I l NA l l NA I 7 3 3 to i a4 as 80 8tesCNNEL turcsbats Nyveta Type l1 i 71' '

I O l O' l O' hdh tsCRiPT'CN -

NA l

.t.scNNEL%LJits Nuvata :ss:mim N@

i, i4 i l 010101@l NA 33 l

7 s 3 it 12

. ss OF 08 O AvaGI 'O 8 Aciufv ,

Tvet  ; tsC *i'* CN i- I ) f I,Z_l@l NA l t ) 7 IQ

• • . B i CI'v NGC yss ONLv Ss'.th OlsC8'F'CN -

j ,:i i x rg j NA I !I t I ifIeI I t il i s 3  : ss sa ac ;

w. ?. Murphy (802) 257-7711  ?-

42vE :Po=E34AEm ** cN E -

2104216 M b

. -- . . . _ . . ._- - -- - - . - - - _ _ _