ML19316A402
| ML19316A402 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/24/1975 |
| From: | Parker W DUKE POWER CO. |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| NUDOCS 7912110661 | |
| Download: ML19316A402 (2) | |
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Unusual Event Report # 75-7, on 9-12-75, Concerning Inadequate control of the isolated 100 KV transmission line........
(1 Copy Received)
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\\7 Mr. Norman C. Moseley, Director w
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U Re: Oconee Unit 1
- /l Docket No. 50-269
Dear Mr. Moseley:
Pursuant to Sections 6.2 and 6.6.2 of the Oconee Nuclear Station
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Technical Specifications, please find attached Unusual Event Report UE-269/75-8.
Very truly yours,
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William O. Parker, Jr. '-1' w u
MST:vr Attachment cc:
Mr. Benard C. Rusche
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('N DUKE POWER COMPANY OCONEE UNIT 1 Report No. :
UE-269/75-8 Report Date:
October 24, 1975 Event Date:
September 12, 1975 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Event:
Inadequate control of the isolated 100 kV transmission line Conditions Prior to Event: Not Applicable Description of Event:
On September 12, 1975, it was determined that Oconee Nuclear Station does not have controls to assure that the 100 kV transmission line from Lee Steam i
Station to Oconee remains isolated when used as a backup source of emergency l
l power. More specifically, a tie is connected such that the Central White transmission line (used as the isolated 100 kV transmission line) provides a backup source of power to one customer in the event its normal source of
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power, the Central Black line, is.deenergized.
The 100 kV transmission line is required to be isolated by Oconee Technical Specifications when operation is permitted in several degraded emergency power configurations.
1 Designation of Apparent Ceure cf Event:
The apparent cause of this event was that the design of the existing customer tie to the Central White line did not consider the possible need of the isolated White line during its use to feed Oconee. As soon as this was i
recognized, a modification was initiated to provide remote blocking of the tie from Oconee.
While this modification was in progress, Oconee understood that the dispatcher would manually block the automatic feature and preventing the possible transfer to the Central White line whenever Oconee required emergency power.
Analysis of Event:
This incident resulted in the possibility of a load being switched on to the isolated 100 kV transmission line during use to supply power to Oconee should the Central Black line be deenergized.
The 100 kV transmission line is required to be isolated and separated from non-safety-related loads only when Oconee operation continues with a degraded condition of available emergency power.
This condition arises infrequently and the combustion turbine and transmission line would have had adequate capacity to carry all existing loads simultaneously.
Therefore, it is concluded that the health and safety of the public was not affected by this incident.
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Corrective Action The modification to enable 'conee to remotely remove loads from the Central White transmission line is being processed in an expedited manner.
In the interim, the tie to the Central White line has been manually disabled.
This will prevent switching on to the line when it is isolated for purposes of supplying Oconee.
In order to assure that proper review and control are exercised in the future in making transmission system modifications related to Oconee emergency power, a July 24, 1975 letter has been sent to the Vice President, Transmissicn and Electric Installations, and the Vice President, System Planning.
This letter advises the interfacing departments of the requirements of Oconee Nucleur Station and requires that the existing and any future ties to the Central White line be capable of being removed remotely from Oconee.
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