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The following information was provided by … The following information was provided by the licensee via phone:</br>At 0346 EDT on 9/27/24, with Unit 1 in mode 1 at 54 percent power, the reactor was manually tripped due to degrading condenser vacuum secondary to environmental conditions. The trip was not complex with all systems responding normally post trip. Closure of containment isolation valves (CIVs) in multiple systems occurred. Operations responded and stabilized the plant.</br>The reactor protection system actuation while critical event is being reported as a 4-hour non-emergency notification per 10 CFR 52.72(b)(2)(iv)(B). Additionally, it is reportable under 10 CFR 52.72(b)(3)(iv)(a) as an event that results in a valid actuation of the CIVs.</br>There was no impact on the health and safety of the public or plant personnel.</br>The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>Decay heat removal is via steam bypass to the main condenser. Unit 2 was not affected.e main condenser. Unit 2 was not affected. +
07:46:00, 27 September 2024 +
07:02:00, 27 September 2024 +
07:46:00, 27 September 2024 +
The following information was provided by … The following information was provided by the licensee via phone:</br>At 0346 EDT on 9/27/24, with Unit 1 in mode 1 at 54 percent power, the reactor was manually tripped due to degrading condenser vacuum secondary to environmental conditions. The trip was not complex with all systems responding normally post trip. Closure of containment isolation valves (CIVs) in multiple systems occurred. Operations responded and stabilized the plant.</br>The reactor protection system actuation while critical event is being reported as a 4-hour non-emergency notification per 10 CFR 52.72(b)(2)(iv)(B). Additionally, it is reportable under 10 CFR 52.72(b)(3)(iv)(a) as an event that results in a valid actuation of the CIVs.</br>There was no impact on the health and safety of the public or plant personnel.</br>The NRC Resident Inspector has been notified.</br>The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:</br>Decay heat removal is via steam bypass to the main condenser. Unit 2 was not affected.e main condenser. Unit 2 was not affected. +
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