ENS 44623
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ENS Event | |
|---|---|
20:50 Nov 2, 2008 | |
| Title | Hpci System Declared Inoperable Due to Controller Failure |
| Event Description | The Unit 1 MCR [Main Control Room] HPCI [High Pressure Coolant Injection] flow indicator was observed oscillating just above zero gpm with periodic spikes to approximately 50% of scale (3000 gpm) with a concurrent drop in flow controller output signal while in standby. There were no activities in progress on or near the HPCI system when the oscillation and instrument spikes occurred. Walkdown of the instrument rack and HPCI room equipment found no abnormalities. The HPCI system was declared inoperable at 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br /> 11/2/2008 (14 day Shutdown LCO). Troubleshooting is in progress to determine the cause of the flow oscillations.
The HPCI system is considered available as there are no indications of controller failure that would impact operation in manual flow control mode. The licensee will inform the NRC Resident Inspector. |
| Where | |
|---|---|
| Limerick Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.28 h-0.0117 days <br />-0.00167 weeks <br />-3.83544e-4 months <br />) | |
| Opened: | Mark Arnosky 20:33 Nov 2, 2008 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Nov 2, 2008 |
| 44623 - 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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