ENS 41645
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ENS Event | |
|---|---|
23:07 Apr 27, 2005 | |
| Title | Main Steam Line Drain Containment Isolation Valves May Not Isolate |
| Event Description | Based on an engineering evaluation it appears that the inboard and outboard secondary containment isolation valves (total of 2 air operated valves) on the Main Steam Line drain system may not adequately close under all postulated conditions. This evaluation is based on 'worst case' assumptions for parameters such as air pressure to the valve actuator and maximum expected differential pressure across the valve. Both valves were declared inoperable and closed per the Tech Spec action statement at normal 100% power conditions.
The licensee will notify the NRC Resident Inspector. |
| Where | |
|---|---|
| Grand Gulf Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000416/LER-2005-002 Regarding Incorrect Assumption Used in Development of Air Operated Valve Program |
| Time - Person (Reporting Time:+1.35 h0.0563 days <br />0.00804 weeks <br />0.00185 months <br />) | |
| Opened: | Hardy Farris 00:28 Apr 28, 2005 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 28, 2005 |
| 41645 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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