05000244/LER-1981-007-03, /03L-0:on 810418,loss of 34.5-kV Supply to Transformer 12 Occurred,Creating Loss of Offsite Power. Caused by Fault in B Phase Vacuum Breaker Switch Which Supplies Spare Transformer 12B

/03L-0:on 810418,loss of 34.5-kV Supply to Transformer 12 Occurred,Creating Loss of Offsite Power. Caused by Fault in B Phase Vacuum Breaker Switch Which Supplies Spare Transformer 12B

ML17309A154
Person / Time
Site:	Ginna
Issue date:	05/11/1981
From:	Edgar C ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17258B043	List: 05000244/LER-1981-007, Forwards LER 81-007/03L-0 05000244/LER-1981-007-03, /03L-0:on 810418,loss of 34.5-kV Supply to Transformer 12 Occurred,Creating Loss of Offsite Power. Caused by Fault in B Phase Vacuum Breaker Switch Which Supplies Spare Transformer 12B ML17258B042
References
LER-81-007-03L, LER-81-7-3L, NUDOCS 8105180308
Download: ML17309A154 (4)

LER-1981-007, /03L-0:on 810418,loss of 34.5-kV Supply to Transformer 12 Occurred,Creating Loss of Offsite Power. Caused by Fault in B Phase Vacuum Breaker Switch Which Supplies Spare Transformer 12B

Event date:
Report date:
2441981007R03 - NRC Website

text

LER 81-007/3L-0 LICENSEE EVENT REPORT CAR 1300 1) 3)

4) 7)

8) 10)

Control Block:

License Type:

I 4', 1'1,',1

', 1',

Docket Number:

I 0 I 5 0

0 0

2 Event Date'IOI 11 I

I 11

Event Description

and Proba

2) Licensee Code'.

'N'Y',R',E',G 0

I 0'0 I - I 0 I 0 5

Cat:

I I

/

6) Report Source 9

Report Date'0'5'1111811 I

ble Consequences:

~

I L I

~

I I

e IDurin steady state operation a loss of the 34.5KV supply tof INo.

12 transformser occured creating a loss of offsite power/

,to anna tation.

is created a loss of power to 1

I usses and 1

and sa eguar busses an 11 Emergency D/G's 1A and 1B started on undervoltage signalI I and suppl ied power to the OV safeguard busses The temporary I

Iinterruption to the ower supply for the 1B instrument bus 11) 14) 17) 18) 21) 23) 25) 27)

System Code '

E A I 1 2)

Cause

Code:

', E 1 3) Cause Subcode:

I A I Comp.

Code:

/,~C/K/T/BIRIKI

15) Subcode;

/X/

16) Valve Code:jZ

/ ~ '-'

'7'/'ction Taken: IX'19) Future Action:

',Z',

20 Effect on Plant: ',B',

Shutdown Method:

I Z I 22)

Houl s' 0 I 0 1 0 I5 I Prime Component Supplier:

IL I

26) Manufacturer:

',J',1'I~2,0',

Cause

Description and Corrective Actions:

',The cause was identified to a fault in the "B" Phase vacuumf

',breaker switch which supplies the 12B spare transformer.

,The 12 transformer was isolated from the 3

.5KV bus and power>

',was restored to the No.

12 transformer.

The safe uard busses',

,were transferred bac to t eir normal supply and the emerpency',

',Diesel Generators secured.

28) 30) 31) 32) 33) 35) 36) 37) 39) 40) 41) 42) 43) 44) 45)

Facility Status:

',E',

Other Status:

1N/A1

Method of Discovery

IAI Discovery Description~IOperator Ob Activity Released:

I Z I 3

Content Amount of'ctivity:,I/AI Location of Release:

/N/Al Personnel Exposures Number:

10 0 I 0 I

Description

', N/A I Personnel Injuries Number:

',0',0',0',

Description

IN/AI Loss of or Damage to Facility:

I Z I

Description

I N/A I Publicity Issued:

I N I

Description

/N/Al IOI9I5 I servationi of Release:

IZI

38) Exposures Type:

', Z NRC USE ONLY Name of Preparer:

Clair Edgar Phone:

315-524-4446 x248

ATTACHMENT TO LER FORM

10) Event Description and Probable Consequences contd:

'caused numerous alarms and an approximate 105 runback to',

5 nuclear power.

Conditions were stablized by operationsI

<personnel and plant o eration continued.

l