ENS 55002
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ENS Event | |
|---|---|
01:18 Nov 17, 2020 | |
| Title | Both Trains of Main Control Room Ventilation and Air Conditioning Systems Inoperable |
| Event Description | At 1918 CST on 11/16/2020, it was discovered both required trains of the Main Control Room Ventilation and Air Conditioning systems were simultaneously inoperable. Due to these inoperabilities, the systems were in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v).
Subsequent post-maintenance testing demonstrated that the Division 1 Main Control Room Ventilation system was available at the time of the event and was restored to operable status at 2036 CST on 11/16/2020. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
| Clinton Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000461/LER-2020-002 Simultaneous Lnoperability of Main Control Room Ventilation Subsystems a and B |
| Time - Person (Reporting Time:+2.37 h0.0988 days <br />0.0141 weeks <br />0.00325 months <br />) | |
| Opened: | James Forman 03:40 Nov 17, 2020 |
| NRC Officer: | Brian Lin |
| Last Updated: | Nov 24, 2020 |
| 55002 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (98 %) |
| After | Power Operation (98 %) |
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