ENS 49454
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ENS Event | |
|---|---|
07:31 Oct 19, 2013 | |
| Title | Group 1 Isolation Due to High Reactor Water Level |
| Event Description | On Saturday, October 19, 2013 at 0331 hours0.00383 days <br />0.0919 hours <br />5.472884e-4 weeks <br />1.259455e-4 months <br />, with the reactor critical at approximately 1% core thermal power and the mode switch in start-up, a high reactor water level condition resulted in a main turbine trip and a valid Group 1 isolation signal. As a result, the Main Steam Isolation Valves (MSIVs) closed.
The plant was in start-up from a forced outage. The initial plant conditions were reactor pressure at approximately 280 psig with a corresponding reactor coolant temperature for that pressure. Currently reactor pressure and water level are being maintained with the MSIVs closed in normal bands. The reactor is being cooled down in preparation for operation in shutdown cooling. Off-site power is supplying station power from the Start-up Transformer (normal power supply for shutdown operations). All plant systems responded as designed. The cause of the increase in reactor water level is currently under investigation. This event had no impact on the health and/or safety of the public. The USNRC Senior Resident Inspector has been notified. |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000293/LER-2013-010 |
| Time - Person (Reporting Time:+2.43 h0.101 days <br />0.0145 weeks <br />0.00333 months <br />) | |
| Opened: | Ken Goodall 09:57 Oct 19, 2013 |
| NRC Officer: | Charles Teal |
| Last Updated: | Oct 19, 2013 |
| 49454 - NRC Website
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