ML19312C224
| ML19312C224 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/09/1976 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19312C218 | List: |
| References | |
| RO-269-76-13, NUDOCS 7912100701 | |
| Download: ML19312C224 (1) | |
Text
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Regulatorj Decket SLe DUKE POWER COMPANY OCONEE UNIT 1
'c:#..! ct NJ Report No.:
R0-269/76-13 Report Date:
September 9, 1976 Occurrence Date: August 10, 1976 qg, Facility:
Oconee Unit 1, Seneca, South Carolina Identification of Occurrence: Penetration room valve PR-2 discovered inoperable Conditions Prior to Occurrence:
Unit at 75 percent full power Description of Occurrence:
On August 10, 1976, prior to purging the Reactor Building, penetration This vi.ve, which is located l
room valve PR-2 was discovered inoperable.
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-open or fully-closed position.
Prior to investigation of the problem, valve PR-2 was immediately isolated by locking closed redundant valve PR-1 located inside the Reactor Building pursuant to Technical Specification 3.6.4.b.2.
7 Designation 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 properly isolated in compliance with Technical Specification 3.6.4.b.2 by securing redundant valve PR-1 in the closed position.
In the event that containment integrity had been required prior to securing valve PR-1, valve PR-1 would have closed upon an ES actuation.
There have been no previous defects in valve exhauster diaphragms. This failure is, therefore, considered a random occurrence and not an indication of a generic problem.
Containment integrity was not affected by this incident and it is, thus, concluded that the health and safety of the public were not affected.
Corrective Action:
Valve PR-2 has been repaired and its operability verified.
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