ML17054D372

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Forwards LER 82-002/03L.Detailed Event Analysis Encl
ML17054D372
Person / Time
Site: Millstone Dominion icon.png
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:
References
CON-IIT07-773-91, CON-IIT7-773-91 MP-2-5044, NUREG-1455, NUDOCS 8202090080
Download: ML17054D372 (6)


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Event Descri tion and Pi obab1es'Conse uencesg~"@j~'E~.'p'll","',

During refueling operations,~a~preventatgve maintenance, test was being performed on static switch VS2. ;'A,.i'S'h'orstgc rcu(tved test~leadjwas leone ected to the printed circuit card of the swit'chj;-'This,causedfa compoyejtgon the card to fail and a silicon controlled rectifier,(SCR.N2)gfooObecomegcontinuously gated. The load on Inverter 62 was transferi ed~togijve~itegrp6~ejbutjbecause S CR 82 was on con-tinuously the inverter, orutlevts~were~~conn'ectedgfjPaparal 1 el. Due to frequency differences a large current>flowjresujted'pion"'eaclj~'inverted causing the input fuses to blow. This resulted<igloss~v'ofmvs(t'alp/nstrument AC 'in panel 8 VA20 which in turn caused contactgcl'osure~P'jpthefoyerprotection c ircuit for shutdown cooling. This caused yal v'gi2-Sl -652'Sstioaclose'~vi~i~vq~p~,",',

Health physics was notified:;to':evacuateathe>steavm.',gen'craters. Maintenance was notified to assist in opening<2;Sl 652~>Its:P,-.@~Rip'@,)j;".,,

The loss of shutdown cooling pi eventsgdecayjheat;.,jremoval, from the reactor vessel. since shutdown cooling',was(restoredilinaafshort peri od of time, i.ess SeVen (7) minutea and reaCtar; COOlannt'<tern'peraturmev';inCreaSed from 84 to 114'F, 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 in performing a preventative maintenance test.'>'@'A>'depmartmental 'memo"'has been issued to test technicians to check all 'test."leadslfor."",short~scircui ts prior to connecting to equipment.

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