05000336/LER-1982-002, Forwards LER 82-002/03L.Detailed Event Analysis Encl

Forwards LER 82-002/03L.Detailed Event Analysis Encl

ML17054D372
Person / Time
Site:	Millstone
Issue date:	02/01/1982
From:	Mroczka E NORTHEAST UTILITIES
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17054D373	List: 05000336/LER-1982-002, Forwards LER 82-002/03L.Detailed Event Analysis Encl 05000336/LER-1982-002-03, /03L-0:on 820106,w/plant in Shutdown for Refueling,Fuses in Inverters 2 & 6 Blew Resulting in Loss of Vital Instrument Panel VA-20 & Causing Closure of Overpressure Circuit.Caused by Short Circuited Test Lead
References
CON-IIT07-773-91, CON-IIT7-773-91 MP-2-5044, NUREG-1455, NUDOCS 8202090080
Download: ML17054D372 (6)

LER-1982-002, Forwards LER 82-002/03L.Detailed Event Analysis Encl

Event date:
Report date:
3361982002R00 - NRC Website

text

i i

. BOX 270 4)FORD, CONNECTICUT 06101

) 666-6011 p.o IIA (203 1982

~ 1'".( I 1(O

~ f be endix A ng to n for oseda V

,V>>,1 on, D.C. (30)

ontrol, ment Branch,

'IIIIFFHIUL~iF>>IIFILFFII'QP'fr.,"k",;ii;.'-"':t'.i~i""';-",P>>Iicji-';l:,.',",.

~F",'~'~"'"~~'.)I,"8":.!"'~<"5'-':"""AFebruary 1, Mr. Rona 1 d C. Haynes

',". ",yi.~l::.p';<'j';:-.',."..'".y<~."-',<<;:.-Sf~-'-~,~g-2>> 5044 Regional Administratorl'egio+nipgjjj!~>><>>a>j~p<%j'~<~psi,.";;:i Office of Inspection" and:Enforcement-.",4z<<'~+-',~~.,+YP+>'<<

D.S. Nuclear Regulatory C'omn$s'sioiig:j'j~ihpz'j4",,;:"

>>'I, 631 Park Avenue;;>,""~49Pj~ggj~>k~~3$ Pj4jy92~*.~4<@'

King of Prussia, Pennsylvania@Pl SI05>>)j>>>>>>!Ig..",. >>ljfh>>E<I',

Reference:

facility Operating~kPiceqs'eNoeIDp>>R';65 Docket No 50.,",336.j<$j<

'4" g>>'")6:

i'eportabl esgcc'uii encehf$ 0-50-..336j52;002 Thi s letter forwar ds Licensee";Event)Rempo,682;,,002K<i equired to submi tted within thirtygday's'~'pui suant,',to Hi+llstone'..'Unit'2 App Technical Spec ifi cat ion s,"Sect".laji 16 e9;1$ ;9". b'cond it ion s leadi operation in a degraded".mode,permittee'd

'b<<yFa31imiting conditio operation.

An additional'>>thi',ee:coapiesaof~the~ieport;are encl

"~'~"'F'")>) 'i"<<+Fruits A%a~~+~%'4'H<<'I'2-

,'<ORTf<EAST"'NUCL'EAR ENERGY'OMPA Y,'", -";

vStatio,.S'upe'r inten en'tgy<~'~,",,

Millstone'jNucleaj.>Power",ISta.tion;" ",

EJM/SS:mo

Attachment:

LER RO-50-336/82-002,"'-'"";j~'k< ~.~~""jg<" "..

~

cc:

Director, Office of Inspection.landt,,Enforicement, Washingt Director, Office of Management)information>and Program C

U. S. Nuclear Regulatory Commission;~Ic/o,O>>ocument Manage Washington, D.C.

20555:,>>'>>'>>i>i~$ !@~QIvvgi>>oa>>

8mR209dM80 82020 l 8

PDR ADO'336 gd 1/

E 1

ib I

ll~

2

.Z(>>"-',iQLICENSPEE>>@ENprrIEIAO@TI( 2>>i 3<<,.";i

>>l 33< Ql>>a'.:;.'.,2"',rICLEA"3 Pn<NT OnTA,YPE'ALLnsou I

"Il) ! JC TI I<3 NI SI 2!OP! OJ 0

-. Of OIA020hr'Oil!'=n 0!r ODBQ3'4 1

1 8

9 I I<:ckI'I IL I'nf)7 14 IIV

'h','=;lQ'+3,'",'LIc)Ns>>lfNUIIBEf}pv7;'vt~",~',3-'2BEJ>>428, ',.'LIGENs

'ON'T 3 J 1,"gth~hhl

! L I(og[ OJ ~50 0 i3l Is~,'Shh 4>>, OIITI~O.

688>>hv 2 i' 0

ooc>>:LTNUhIBEtrh>>IE'4 "<<434~/>>'f89ptfj<(!EYE!JT~PTEYK<>>>> (A) "2,24 rVFNT l)I Soll IP TIOr4 I rJO t t}ODAOLECONSEOi) EDGES ~~P e'L,.'"AL~ iI."'.;I's,',j~'f<+F,'.g>>

o 2

With the plant shutdown for,refiielin +ifuses4$ nkinverteis 2 and 6

IRCD ItJFOI}MATrotJ) 11OL! IO

~ZMOQ~JZJOF IICPDflt DAIE 80 I

0 3

in 1 oss of vi ta1 ins trument 'panelaVA;.20fcausing>>Itc1 osureIFof the over ressure circuit blew resulting J

" "'" <<K%f9 <4-zi'o44z< <<(@~47+>>" '" J'rrrhv Wi~~'""'

o-~-'g L restored in 7 minutes.,'The plant was~foperated6inkaccorda<<nce with T.S.A.S. 3.9.8.2 J

..J.3 I

3 4]

I for shut down cooling whrch',causedkvalvee(2-Sl;,652~gtoBclos'e.':

Shutdown coolrn<L was J

1 during this event.

off L No similaigLER1>>s'Dial"'Q>i4W>,.'..=.2")~>>>L.YA B>><<lv. <<f'iC-y '('4 +Ps(>>i'Y 2',,'<", <<r<,4>> 'M'-.wt<shv'<'~<leva"3 4 ~, I>>,'.

s<<.I tf>>ivy~ha>> 8 <st>> ~~>>h'E>>tw

'X>3>>24<<Y'.'4'0

V fCM

cAUsE

cAUEE l,'D4j~fgi~3yP>+ ~12>>JI<t> cswg A>>4~ ~/~~>~>>",,'

coh'IP.

YALvE CODE CODE SUB>>CODE'Sw;>>gt4"%'COiIPOIJENTLCDDE(<'fgPN.'j,

'UBcODE sUUCODE oi'Igo

~E CJQ>>

IQEQ23

'.~A'hs TJ'I(C TK!IIT, rB

'ER tK Q<4

- ~EQ2"

~Z Qho 8

9 10 I I

'24,:;>.'>>g~~gj63(~~gf"<>>Fdic}>>~.g>>'.,IB 19 20

,"$<SEQULENTIALLAIL>>);+@~>>(<gj'TI>> 'PVOCCUAHCtICE 'CFOIIT HLVIS<ON Lt 8/Ho Lvc>>JT YEAR

'->>HcPDHT No gfjl",.@',~QQg~j)V'.~'<coDElv(',

TYPE No.

Ql inio>>r [8~2

~

."~00, ZP, II.'.".jl~pfjh<rh.LOD3I", ~L

~

0 2l 27 23 '; 2 ~'";t>>,L'4>>t<22<v"h.<r2 y>>}4528r>>PFhh'23 34 31 32 Ac'tloN Fvtuf<E EFFEGT BHUTDotvN f<ff'1 "%/I;...~Zi4ik~u~. ATTAclIMENT'~r 'NPADQ PRIME coMP.

coMIQNENT TA>>CEN ACtION ON pLANT h<ETHOD

!Epvu4FA+g"gPOUHS(Q2>

ISUBhlITTED ~j'FonhlhUB.

sUPPLIER IIANUFACIUI<LH LEIQhs l2JQho LZJQ23

~Q22 h.'.h 0~ ON Oa OR <<dL~RY O23 '. h~NQ24

~AS ~K~~Ql 33 34 43 44 47 causE oE cnlP TION ANo coRRFcT}ve acT}otJ's',022

'~j'~~~~Rji)",,gj, <<.,",~;"""~~",l~;g",,".'

A short circul ted test lead'caus'ed! a; r<nted'>>ca<icu<tvto fall.

The load was f>>>>hP@)$ 4.e f Qjj>>>>4,<<@2>>,,';.

',li 42".iiii

h ii i

4 ~hh h

L.~~'3<".XQ">>2"AK~)~~7<~u,~tp4~:s,~~",

4 2

blew the fuses in both inverte<<rs~qphz~departmentalIImueiM was issued to all tech-

- F"5%'222<<<<~4.2 ~+

3 nicians to check a 1 1 1 eads 'rio07(4<h togconnecti on(toiftes t equi pmen t

'" "'3'ff:"",>>7m~, <<r,<".Fj~4~p. 4'-t~q~ s'ggfg."~JR 7

8 9

6 AC ILI 1 Y STATUS

% povvER KZ bdQB ~~Q>>

I 8

9 10 12 I '1 ACTIVITY CONTENT fIELCASED OF RElEASE AIIOU G

~Z Q33

~ZQ34 7

8 9

10 11 Pf RSUNNEL fXPOSLI<IES LOBON ogO<l z

Q33 I

8 9

11 12 13 rcrlso>>INEI. I>>rdurlrcs NUh<BEf1 ocscnlplloN 41

~22

~00 0

Q4o 8

9 11 12 LOSS Of Oft OAK<AGE TU fACILITY 43 1 YPE DFSCIIIPT ION

~ho

~ZQ42 8

9 10 PUBLICITY ISSUED UESCfl

> ",I OTHER STATUS h~ l~L4OISCOVEAY:kggv'~ ('>> '>> >'T OF ACTIVITY~ 4< +ih<>>'-;Tom&;-0~ <<fj< hyI Y<< "<3 orscovcnv DEScnrptroN Q32 ra tor observa tion LOCAI<UN Or RF.LEASE Q3G NA ~.. 82020'3100'll 'S2020 i -",",:, PDR ADOGK'I05OQ0336'8 '%'t Q PjtF lgttvryf '~i~' f CPDR NRC uSE ONLY 8 9 10 Nah'lE QF PREPARER 34'p v 3<'tr< <4<<r Steve Stadnic 4~M""".vkT'~4"~L~~2~-'~Fhtf, '; ptroNE ~ <<hh 3 ~ ~ rr Ih,>>h'4. 80 80 80 80 80 I 80 ~ S 0 Vh0 I 4< JJ was being performed ected to the printed card to fail and a gated. The load CR 82 was on con-Due to frequency causing the input 'in panel 8 VA20 ircuit for shutdown Maintenance was om the reactor od of time, i.ess from 84 to 114'F, in performing a issued to test to connecting to Event Descri tion and Pi obab1es'Conse uencesg~"@j~'E~.'p'll","', During refueling operations,~a~preventatgve maintenance, test on static switch VS2.

'A,.i'S'h'orstgc rcu(tved test~leadjwas leone circuit card of the swit'chj;-'This,causedfa compoyejtgon the silicon controlled rectifier,(SCR.N2)gfooObecomegcontinuously on Inverter 62 was transferi ed~togijve~itegrp6~ejbutjbecause S

tinuously the inverter, orutlevts~were~~conn'ectedgfjPaparal 1 el. differences a large current>flowjresujted'pion"'eaclj~'inverted fuses to blow. This resulted<igloss~v'ofmvs(t'alp/nstrument AC which in turn caused contactgcl'osure~P'jpthefoyerprotection c cooling. This caused yal v'gi2-Sl -652'Sstioaclose'~vi~i~vq~p~,",', Health physics was notified:;to':evacuateathe>steavm.',gen'craters. notified to assist in opening<2;Sl 652~>Its:P,-.@~Rip'@,)j;".,, The loss of shutdown cooling pi eventsgdecayjheat;.,jremoval, fr vessel. since shutdown cooling',was(restoredilinaafshort peri SeVen (7) minutea and reaCtar; COOlannt'<tern'peraturmev';inCreaSed there was no significant effectwsonYthgepla'nt.':,,",, ...'fi;,". Cause Descri tion and Corrective" Actions~4@>;A; ~~ ~~'.."4'"< " The cause of this event was,a,eshortI~circuited;test~lead.used preventative maintenance test.'>'@'A>'depmartmental 'memo"'has been technicians to check all 'test."leadslfor."",short~scircui ts prior equipment. sn /vs> + 'fIsh+& iI'i >"-'5,~eh ppcp+~; 5~4' Nj V c 0 )