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The following information was provided by … The following information was provided by the licensee via phone and email:</br>On February 3, 2026, at 2338 CST, River Bend Station (RBS) was operating at 100 percent reactor power when the standby service water pump `C' (SWP-P2C) faulted, tripped, and locked out during the performance of a routine surveillance. The pump fault caused E22-ACB04, the normal division III 4.16 KV bus supply breaker, to trip and lock out. The division Ill emergency diesel generator (EDG) started as designed and powered the division III 4.16 KV bus. There are no signs of fire. The cause of the SWP-P2C fault is still under investigation.</br>The trip of E22-ACB04 resulted in the inability to meet (surveillance requirement) SR 3.8.9.1 forcing entry into (limiting condition for operation) LCO 3.8.9 required action 'E.1' and declaring the (high-pressure core spray) HPCS system inoperable.</br>This event is being reported under 10 CFR 50.72(b)(3)(iv)(A) as an event or condition that results in valid actuation of emergency AC electrical power systems and 10 CFR 50.72(b)(3)(v)(D) as an event or condition that at the time of discovery could have prevented the fulfillment of a safety function.</br>The NRC Resident has been notified.ction.
The NRC Resident has been notified. +
05:38:00, 4 February 2026 +
58,148 +
07:09:00, 4 February 2026 +
05:38:00, 4 February 2026 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On February 3, 2026, at 2338 CST, River Bend Station (RBS) was operating at 100 percent reactor power when the standby service water pump `C' (SWP-P2C) faulted, tripped, and locked out during the performance of a routine surveillance. The pump fault caused E22-ACB04, the normal division III 4.16 KV bus supply breaker, to trip and lock out. The division Ill emergency diesel generator (EDG) started as designed and powered the division III 4.16 KV bus. There are no signs of fire. The cause of the SWP-P2C fault is still under investigation.</br>The trip of E22-ACB04 resulted in the inability to meet (surveillance requirement) SR 3.8.9.1 forcing entry into (limiting condition for operation) LCO 3.8.9 required action 'E.1' and declaring the (high-pressure core spray) HPCS system inoperable.</br>This event is being reported under 10 CFR 50.72(b)(3)(iv)(A) as an event or condition that results in valid actuation of emergency AC electrical power systems and 10 CFR 50.72(b)(3)(v)(D) as an event or condition that at the time of discovery could have prevented the fulfillment of a safety function.</br>The NRC Resident has been notified.ction.
The NRC Resident has been notified. +
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100 +
00:00:00, 4 February 2026 +
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>.
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0.0633 d (1.52 hours, 0.00905 weeks, 0.00208 months) +
05:38:00, 4 February 2026 +
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