ML19308A989
| ML19308A989 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/02/1973 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19308A986 | List: |
| References | |
| RO-269-73-10, NUDOCS 7912120750 | |
| Download: ML19308A989 (1) | |
Text
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O eau 4,u :ac /td N DUKE POWER COMPANY OCONEE NUCLEAR STATION - UNIT I UNUSUAL EVENT REPORT UE-269/73-10 ENGINEERED SAFEGUARDS VALVE HP-27 Description of the incident On October 3, 1973, periodic test PT/0/A/202/ll, "HPI System Performance Test," was conducted to verify the proper operation of the high pressure injection pumps.
During the test of the high pressure injection pump 1C, the discharge valve HP-27 failed to open.
It was determined that the MB/6 Interlock contacts were fouled and required cleaning.
During the p 4rfo'rmance of the periodic test, it was observed that the pressurizer level was increasing, which indicated that valve HP-27 had not closed properly.
Correct}veAction The MB-6 interlock contacts which prevented the valve from opening were cleaned. Valve operability was verified during the performance of the periodic test PT/0/A/202/ll.
Safety Analysis As a result of the analysis for high energy line breaks outside containment and until modifications are completed, Engineered Safeguards valve HP-27 is required to bs open except during testing. Any failure of this valve would be during testing, and the fall Jre would be of short duration.
Furthermore, there is an additional high pressure injection flow path available through HP-26.
If required, additional emergency core cooling would be provided by the low pressure injection system and the core flooding system.
It is concluded that the failure of HP-27 to open did not affect i
the operational safety of the plant.
7912120
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