ENS 54880
ENS Event | |
|---|---|
01:48 Sep 4, 2020 | |
| Title | |
| Event Description | River Bend Station experienced an inadvertent initiation and injection of High Pressure Core Spray (HPCS) at 2048 [CDT] on 9/3/2020 while operating at 92% power. Initial investigation indicates a power supply failure in the Division III trip units which feeds HPCS and Division III Diesel Initiation signals.
The Control Room Operator responded to the event by taking manual control of Feedwater Level Control to maintain Reactor Water Level nominal values. The HPCS injection valve was open for approximately 25 seconds before operators manually closed the valve. The manual closure of the injection isolation valve caused the system to be incapable of responding to an automatic actuation signal. The manual override of the injection isolation valve was reset approximately 52 minutes after the event. The HPCS system has remained inoperable. The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that caused loss of function of the HPCS System. No radiological releases have occurred due to this event. The Senior NRC Resident Inspector has been notified. These conditions put the unit in a 14-day LCO (3.5.1) for HPCS Inoperability and a 30-day LCO (3.7.1) for one Standby Service Water Pump Inoperable (2C). |
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.13 h-0.00542 days <br />-7.738095e-4 weeks <br />-1.78074e-4 months <br />) | |
| Opened: | Jason Arms 01:40 Sep 4, 2020 |
| NRC Officer: | Bethany Cecere |
| Last Updated: | Sep 4, 2020 |
| 54880 - NRC Website
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