ML19312C208
| ML19312C208 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 12/18/1975 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19312C205 | List: |
| References | |
| RO-269-75-09, RO-269-75-9, NUDOCS 7912100690 | |
| Download: ML19312C208 (1) | |
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DUKE POWER COMPANY OCONEE UNIT 1 1
Report No.: UE-269/75-9 Report Date: December 18, 1975 qgg Event Date:
November 13, 1975 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Event:
Low Pressure Injection System valves manually inoperable Conditions Prior to Event: Unit at 100% full power Description of Event:
On November 13, 1975, during performance of surveillance testing on the Oconee Unit 1 LPI System, valves ILP-17 and ILP-18 (LPI header isol -ion valves) could not be operated manually. These valves were cycled electrically to verify their operability in the Engineered Safeguards Mode.
Apparent Cause of Event:
Investigation indicated that the torque switch on the valve motor controllers had been improperly set causing the valve to seat too securely.
Thus, manual operation was not possible. This condition was verified by manually operating both valves after they were first unseated by electric operation.
Analysis of Event:
Periodic testing as required by Oconee Technical Specification 4.5.1.2.2.c is performed on these valves to assure that they can be manually operated to provide long-term emergency core cooling should electrical operation not be possible.
In this event, both valves would have operated correctly had an ES actuation signal been received.
It is concluded, therefore, that the health and safety of the public was not affected by this event.
Corrective Accion:
l The torque switch setting on each valve, ILP-17 and ILP-18, was properly adjusted, and the valves were successfully tested to assure correct operation l
on November 17, 1975.
In addition, surveillance testing will be performed on similar LPI valves in Units 2 and 3 by December 26, 1975 to assure their proper manual operation. As a final measure, present maintenance procedures will be changed to require verification of manual operability of LPI System valves after adjustment of the torque switch setting.
This change will be implemented prior to December 31, 1975.
7912100h D