ML19270G653
| ML19270G653 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/25/1979 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| References | |
| NUDOCS 7906140475 | |
| Download: ML19270G653 (1) | |
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Virginia Electrie and Power Cowarv North Anna Pc-er Station. Unit 1 NPF-4 79 AFR25 A 8., 32 Decket No. 50- E8 24 Hcur Reportable Event Written Folicw-Up Event:
Transfer Bus Overloads LER/R0 79-057/01T-0 Cn 4/24/79, tra Station Personcel at North Anna Pcuer Station were informed of a potential for an overicad condition en the Station Transfer As a result of a review of the electrical require:wnts during cc.rbine Bus.
unit aperation of Units 1 and 2. the 4160 volt transfer bus and transfer tus feeder breakers are not capable of continually carrying full load current For example, if Unit 1 was cperating and Unit 2 was for certain canditions.
in the prccess of startira up, the additional load on the transfer bus if Unit I were to trip would result in an overload of the above mentioned ccepo-
'This overicad would not result in an 1:arediate trip, but wculd result nents.
in heating up the transfer bus ctmponents.
This conditica is believed to be due to imprcper sizing of transfer bus equi rcent.
Since Unit 1 is in Cold Shutdown, this event had no effect on plant status.
Presently a ceans of limiting the transfer bus leads is being considered and analysis of a final solution is teing pursued.
'I L P. O'REltty
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