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The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0321 CDT on 10/6/2025, with Unit 1 in mode 1 at 23 percent power, the reactor automatically tripped due to reactor water level rising to the reactor protection system auto-scram setpoint, prior to the manual scram being completed. The trip was not complex with all systems responding normally post-trip. The trip occurred as the station was transitioning level control from the motor driven reactor feed pump to the `A' turbine driven reactor feed pump as part of plant startup. Due to the reactor protection system actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).</br>Operations responded using emergency operating procedure 1 (reactor pressure vessel control) and stabilized the plant in mode 3. Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves.</br>The digital feedwater level control system response is still under investigation.</br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
08:21:00, 6 October 2025 +
06:32:00, 6 October 2025 +
08:21:00, 6 October 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0321 CDT on 10/6/2025, with Unit 1 in mode 1 at 23 percent power, the reactor automatically tripped due to reactor water level rising to the reactor protection system auto-scram setpoint, prior to the manual scram being completed. The trip was not complex with all systems responding normally post-trip. The trip occurred as the station was transitioning level control from the motor driven reactor feed pump to the `A' turbine driven reactor feed pump as part of plant startup. Due to the reactor protection system actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).</br>Operations responded using emergency operating procedure 1 (reactor pressure vessel control) and stabilized the plant in mode 3. Decay heat is removed by discharging steam to the main condenser using the turbine bypass valves.</br>The digital feedwater level control system response is still under investigation.</br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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23 +
00:00:00, 6 October 2025 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
11:20:06, 8 October 2025 +
06:32:00, 6 October 2025 +
true +
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08:21:00, 6 October 2025 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.