ML19317D811
| ML19317D811 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/21/1977 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317D804 | List: |
| References | |
| RO-269--77-12, NUDOCS 7912100550 | |
| Download: ML19317D811 (1) | |
Text
I D'JKI POWER COMPANY OCONIE UNIT 1 i
~ Report No.:
RO-269/77-12 tr Eeport Date: April 21, 1977 Occurrence Date:
March 26, 1977 Pacility: Oconee Unit 1, Seneca, South Carolina Identification of Occurrence: Penetration room valve PR-2 discovered inoperable Conditions Prior to Occurrence: Unit in cold shutdown Dercription of Occurrence:
On March 26, 1976, while performing a functional test on Reactor Building isolation channel 6, penetration room valve PR-2 was discovered inoperable.
This valve, which is located outside the Reactor Building in the purge piping, provides containment isolation following an ES actuation. Valve PR-2 failed in the intermediate position and could not be cycled to a fully-closed position. Valve PR-2 was isolated by redundant valve PR-1 which was in the closed position. However, due to personnel error, valve PR-1 was not locked closed as required by Technical Specification 3.6.4.b.2.
Vcive PR-2 was returned to service within 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
Dasignation of Apparent Cause of Occurrence:
PR-2 is an air-operated valve. The exhauster in the air supply, which removes air when the valve is closed, contained a ruptured diaphragm resulting in insufficient air pressure to activate the valve.
Analysis of Occurrence:
Valve PR-2 was isolated by redundant valve PR-1 which was in the closed ES position.
In the event that containment integrity had been required valve PR-1 would have remained closed upon an ES actuation. Containment integrity was not affected by this incident and it is, thus, concluded th t the health and safety of the public were not affected.
Corrective Action:
Valve PR-2 has been repaired and its operability verified. A study of the feasibility of including inspections anc, as necessary, replacement of exhzuster diaphrages on safety-related valves of this type in the periodic maintenance program will be made by July 1, 1977.
In order the assure that the provisions of Technical Specification 3.6.4.b.2 are complied with in the future, administrative action vill b2 taken by May 2, 1977.
b 5 g ri '.
- 79121005 90