Browse wiki
Jump to navigation
Jump to search
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On October 9, 2025, at 1207 CDT, River Bend Station (RBS) was operating at 100 percent reactor power when a manual reactor protection system (RPS) actuation was inserted as a result of a division-I balance of plant (BOP) isolation. The BOP isolation was a result of a blown fuse during surveillance activity. The BOP isolation resulted in the loss of instrument air system (IAS) and component cooling primary system (CCP) to containment. </br>Following the isolation, control room operators entered the applicable abnormal operating procedures (AOP). In accordance with AOP guidance, control room operators inserted a manual reactor scram. All plant systems responded as designed. Immediately after the scram, a reactor water level 3 isolation signal was received as expected. </br>Due to the swell from the main turbine trip, a reactor water high level 8 actuation signal was received at 1208 CDT. The level 8 actuation signal was reset at 1211 CDT. At 1237 CDT, control room operators entered the emergency operating procedure (EOP) for high containment pressure. The increase in containment pressure was due to the isolation of the containment vent flow path. </br>The isolation signal for IAS and CCP was reset at 1255 CDT. Following the restoration of the isolation signal, control room operators lowered containment pressure and exited the EOP at 1305 CDT.</br>Reactor pressure is being maintained by the main turbine bypass valves. Reactor level is being maintained by condensate and main feedwater. RBS is currently in mode 3. No radiological releases have occurred due to this event. </br>The event is being reported under 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A) as an event or condition that results in actuation of the RPS when the reactor is critical and as a specified system actuation due to the expected reactor water level 3 isolation signal immediately following the reactor scram, and a subsequent level 8 signal.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.
17:07:00, 9 October 2025 +
16:39:00, 9 October 2025 +
17:07:00, 9 October 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On October 9, 2025, at 1207 CDT, River Bend Station (RBS) was operating at 100 percent reactor power when a manual reactor protection system (RPS) actuation was inserted as a result of a division-I balance of plant (BOP) isolation. The BOP isolation was a result of a blown fuse during surveillance activity. The BOP isolation resulted in the loss of instrument air system (IAS) and component cooling primary system (CCP) to containment. </br>Following the isolation, control room operators entered the applicable abnormal operating procedures (AOP). In accordance with AOP guidance, control room operators inserted a manual reactor scram. All plant systems responded as designed. Immediately after the scram, a reactor water level 3 isolation signal was received as expected. </br>Due to the swell from the main turbine trip, a reactor water high level 8 actuation signal was received at 1208 CDT. The level 8 actuation signal was reset at 1211 CDT. At 1237 CDT, control room operators entered the emergency operating procedure (EOP) for high containment pressure. The increase in containment pressure was due to the isolation of the containment vent flow path. </br>The isolation signal for IAS and CCP was reset at 1255 CDT. Following the restoration of the isolation signal, control room operators lowered containment pressure and exited the EOP at 1305 CDT.</br>Reactor pressure is being maintained by the main turbine bypass valves. Reactor level is being maintained by condensate and main feedwater. RBS is currently in mode 3. No radiological releases have occurred due to this event. </br>The event is being reported under 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A) as an event or condition that results in actuation of the RPS when the reactor is critical and as a specified system actuation due to the expected reactor water level 3 isolation signal immediately following the reactor scram, and a subsequent level 8 signal.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
100 +
00:00:00, 9 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>.
11:20:07, 14 October 2025 +
16:39:00, 9 October 2025 +
true +
true +
-0.0196 d (-0.47 hours, -0.0028 weeks, -6.43806e-4 months) +
17:07:00, 9 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.