ENS 45388
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ENS Event | |
|---|---|
16:27 Sep 29, 2009 | |
| Title | Loss of Water from Upper Refuel Pool |
| Event Description | On 9/29/2009, at 1127 hours0.013 days <br />0.313 hours <br />0.00186 weeks <br />4.288235e-4 months <br />, with the plant in Mode 5, Refuel, upper pool filled for refuel activities, and no fuel handling or control rod movement activities in progress, River Bend Station operators manually started Low Pressure Coolant Injection Pump Charlie to facilitate filling of the upper pool. This action was necessary to offset a loss of upper pool water through a main steam line and into the drywell. Approximately 5000 gallons of water drained from the upper pool into the drywell. Initial investigation found that the leakage was past a partially de-flated main steam line plug, through Safety Relief Valve flanges, which were not fully torqued at the time. The steam line plug became deflated during ECCS testing when service air isolated to containment. The service air system provides a backup to the mechanical seal. The drywell was evacuated and actions were initiated to close containment. The steam line plug was re-inflated which stopped leakage to the main steam line and drywell. At no time during the event was River Bend Station out of compliance with Technical Specification requirements for the upper pool. River Bend personnel are performing further investigations into the cause of the event.
The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.13 h-0.00542 days <br />-7.738095e-4 weeks <br />-1.78074e-4 months <br />) | |
| Opened: | Tim Venable 16:19 Sep 29, 2009 |
| NRC Officer: | John Knoke |
| Last Updated: | Sep 29, 2009 |
| 45388 - NRC Website | |
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