ENS 57485
ENS Event | |
|---|---|
13:55 Jan 4, 2025 | |
| Title | Inoperability of Both Trains of the Control Room Emergency Air Temperature Control System (CREATCS) |
| Event Description | The following information was provided by the licensee via phone and email:
At 0855 EST on 01/04/2025, it was discovered that both trains of the CREATCS were simultaneously inoperable; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). At 1408 on 01/04/2025, the 'A' main control room (MCR) chiller was restored to operable following corrective maintenance, and technical specification (TS) limiting condition for operation (LCO) 3.0.3 was exited. The 'B' MCR chiller remains inoperable due to a component outage. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: The 'A' MCR chiller tripped due to low oil level. LCO 3.0.3 was entered in accordance with TS 3.7.11. |
| Where | |
|---|---|
| Watts Bar Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.83 h0.0346 days <br />0.00494 weeks <br />0.00114 months <br />) | |
| Opened: | Sean Lorson 14:45 Jan 4, 2025 |
| NRC Officer: | Adam Koziol |
| Last Updated: | Jan 4, 2025 |
| 57485 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |