ML20041F928

LER 82-002/03L-0:on 820206,ac Ground & Blown Fuse Alarms Activated,Rendering Trouble Alarm UPS-B Inoperable.Caused by Blown Fuse M Transient Suppression Circuit Due to Shorted Out Capacitor Off Board 2A 17

ML20041F928
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/03/1982
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20041F921	List: ML20041F920 ML20041F928
References
LER-82-002-03L, LER-82-2-3L, NUDOCS 8203170557
Download: ML20041F928 (1)

Text

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Un LICENSEE EVENT REPORT LER 82-2/3L

.

• CONTROL BLOCet l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI l0 l1l8 9lV lTLICENSEE i

IV lYCODE lS ll l@l 0 l 0 l -l 0 l LICENSE 14 1S 0 l oNUN l 0*BEHl o l- l0 l0 l@l4 26 26 l1 LICENSE 11 11TYPE l1JOl@l$7 C Al T b6l@

CON'T lol11 ,[RCE l L hl O l 5 l 0 l 010 l 2 l 7 l1 hl 0 l 2 l 0 l 6 l 8 l 2 @l 0 l 3 l 0 l 3 l 8 l280l@ 14 3 3 60 61 DOCKET NUVBER 66 69 Et ENT D ATE 75 REPORT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Io !2l l With the plant at standby state Control Room Personnel reported a UPS-B Trouble Alarm. l

[ o ,3 , l Upon investigation, it was found that the AC Ground Alarm and Blown Fuse Alarm were l

[ojajl activated. The f requency was greater than 60 Hz and the voltage dropped below rated l

[oj3j lvalue. UPS-B was declared inoperable in accordance with Tech. Spec. 3.10.B.4 and was l io is ] l de-energized. Maint. tie-breakers for MCC-89B were closed. Alternate testing was donel l 0 l 7 l l per Tech. Spec. 3.5.A.4. There were no adverse consequences to the public health and l

,g,,,  ; safety as a result of this event. No similar events have been reported. l 80 7 8 9 54STEV CAUSE CAUSE COMP. VALVE CLDE CODE SUSCOOE COMPONENT CODE SUBCODE SU8 CODE g i 8 l El Dlh Wh Wh lXlX I X lX lX lX lh Wh W h 9 10 11 17 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISloN EVENT VE AR REPORT NO. CODE TYPE NO.

LE 4 RO h 4EP , l8 l2 l l-l l 0l 0l 2l l/] l0 l3 l lLl l-l l0l

,._ 21 22 23 24 26 27 28 23 Ju 31 32 AKE ACT C O PLANT ET HOURS 22 S '3 IT FO h is . SUPPLI MANIFACTURER

(.Zjh lZlh l0l0l0l l lNlg lY[g lLlg lE l3 l5 l5 lg lJJ ^ lh[34Z}@ . .

33 ._. J6 3# 40 41 42 43 44 47 CAUSE DESCRi* TION AND CORRECTIVE ACTIONS h i go;lA transient suppression capacitor off 2A 17: Transient Suppression Board shorted out  ;

i, ; , j g causing a fuse to blow in the Transient Suppression Circuit. One (1) other capacitor l off 2A 17 failed and another was found to be stressed. The three (3) capacitors were  ;

,, , , , i

,, , , , ; replaced and the system was operationally tested and placed back in full service.  ;

l 12 14 1 l 80 7 d 9

$A S N POWE R OTHE R STA TUS tS O RY DISCOVERY 0ESCRIPTION l

I1 15 l l Elh l1 l 0 l0 l@l NA l W hl Alarm in Control Room ACTivt TY CO TENT RELEASED OF RELEASE AVOUNT JF ACTIVITY LOCATION OF RELEASE NA l l1 16I d hlZl@l 7 8 9 10 11 NA 44 l l 4S 80 PERSONNEL FXPOSURES NUYBER TYPE DE SCRIPTION l l 7 l j 0l 0 l 0 l@]@[ 1 NA l

PERSONNE L iN;u',fiES NU me DESCR,PTiON@

lt l-ll0l0l0l@l 7 8 9 11 12 NA 80 l

TOSS OF OR DAMAGE TO F ACILITY Q TYPE DESCRIPTION v 11 19 l l, Z,}hl NA l P ett tY 37 7 hPDR NRC USE ONLY llllllllllll[.

y l Nl@l S l 68 69 80 &

7 8 9 to Werren P. Murphy PHONE:

NAME OF PREPARER