ENS 55229
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ENS Event | |
|---|---|
11:55 May 1, 2021 | |
| Title | Automatic Reactor Trip and Actuation of the Auxiliary Feedwater System |
| Event Description | At 0755 EDT, on May 1, 2021, with Unit 2 in Mode 3 at 0 percent (not critical) power, the reactor trip breakers opened during heat-up activities. The trip was not complex, with all systems responding normally post-trip. At 1013 EDT, on May 1, 2021, with Unit 2 in Mode 3 at 0 percent power, an actuation of the Auxiliary Feedwater (AFW) System occurred. The loss of both main feedwater pump turbines caused an AFW auto-start. The 2A and 2B motor driven auxiliary feedwater (MDAFW) pumps automatically started as designed when the loss of both main feedwater pumps signal was received. The cause of the actuation is still being evaluated.
Operations responded and stabilized the plant. Decay heat is being removed by the steam generators and discharging steam to the condenser. Unit 1 is not affected. Due to the Reactor Protection System (RPS) actuation while not critical and the actuation of the AFW system, this event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Catawba  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+3.73 h0.155 days <br />0.0222 weeks <br />0.00511 months <br />) | |
| Opened: | Scott Milton 15:39 May 1, 2021 |
| NRC Officer: | Joanna Bridge |
| Last Updated: | May 1, 2021 |
| 55229 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | A |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 570262024-03-13T01:11:00013 March 2024 01:11:00
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