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The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1207 EDT on September 10, 2025, Oconee Nuclear Station Unit 1 declared an Unusual Event (SU5.1) due to identified reactor coolant system (RCS) leakage from Unit 1 for greater than 15 minutes. The calculated leak rate was 26 gallons per minute (gpm).</br>The leakage was identified to be from letdown filter 1A, which was subsequently isolated.</br>Units 2 and 3 remain at 100 percent power and are unaffected by this event.</br>This event was terminated at 1353 after isolating the source of the leak.</br>The NRC Resident Inspector has been notified.</br>Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email).lear SSA (email), CWMD Watch Desk (email). +
16:07:00, 10 September 2025 +
57,914 +
12:26:00, 10 September 2025 +
16:07:00, 10 September 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1207 EDT on September 10, 2025, Oconee Nuclear Station Unit 1 declared an Unusual Event (SU5.1) due to identified reactor coolant system (RCS) leakage from Unit 1 for greater than 15 minutes. The calculated leak rate was 26 gallons per minute (gpm).</br>The leakage was identified to be from letdown filter 1A, which was subsequently isolated.</br>Units 2 and 3 remain at 100 percent power and are unaffected by this event.</br>This event was terminated at 1353 after isolating the source of the leak.</br>The NRC Resident Inspector has been notified.</br>Notified DHS SWO, FEMA Operations Center, CISA Central Watch Officer, FEMA NWC, DHS Nuclear SSA (email), CWMD Watch Desk (email).lear SSA (email), CWMD Watch Desk (email). +
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, 10 September 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>.
11:20:09, 12 September 2025 +
12:26:00, 10 September 2025 +
true +
false +
-0.153 d (-3.68 hours, -0.0219 weeks, -0.00504 months) +
16:07:00, 10 September 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.