Browse wiki
Jump to navigation
Jump to search
100 +
The following information was provided by … The following information was provided by the licensee via fax or email:</br>On June 4, 2024, at 2141 PDT, with the unit in Mode 1 at 100 percent power, the reactor protection system (RPS) 'B' power supply unexpectedly de-energized which caused containment isolations to occur in reactor water clean up, equipment drains radioactive, floor drains radioactive, reactor recirculation, and traversing in-core probe systems. All actuations occurred as designed upon the partial loss of RPS power. </br>This event is being reported pursuant to 10 CFR 50.72(b)(3)(xiii) as a major loss of emergency assessment capability due to the inability to assess primary containment identified and unidentified leakage rates. Emergency assessment capability was restored at 2204.</br>The NRC Senior Resident has been notified.</br>* * * UPDATE ON 8/1/24 AT 1925 EDT FROM CHASE WILLIAMS TO ADAM KOZIOL * * *</br>A clarification for reactor recirculation valve isolation above - the flow path was administratively isolated prior to the event. </br>After further evaluation it has been confirmed that the containment isolations were not caused due to any actual plant conditions or system parameters that satisfied the requirements for isolation. The isolations were a result of loss of power to the RPS 'B' bus and therefore are not considered valid actuations.</br>As indicated in 10 CFR 50.73(a)(1), in the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv)(A), the licensee may, at its option, provide a telephonic notification to the NRC Operations Center within 60 days of discovery of the event instead of submitting a written licensee event report. This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) for invalid actuations reported under 10 CFR 50.73(a)(2)(iv)(A).</br>Notified R4DO (Werner)50.73(a)(2)(iv)(A).
Notified R4DO (Werner) +
04:41:00, 5 June 2024 +
19:27:00, 5 June 2024 +
04:41:00, 5 June 2024 +
The following information was provided by … The following information was provided by the licensee via fax or email:</br>On June 4, 2024, at 2141 PDT, with the unit in Mode 1 at 100 percent power, the reactor protection system (RPS) 'B' power supply unexpectedly de-energized which caused containment isolations to occur in reactor water clean up, equipment drains radioactive, floor drains radioactive, reactor recirculation, and traversing in-core probe systems. All actuations occurred as designed upon the partial loss of RPS power. </br>This event is being reported pursuant to 10 CFR 50.72(b)(3)(xiii) as a major loss of emergency assessment capability due to the inability to assess primary containment identified and unidentified leakage rates. Emergency assessment capability was restored at 2204.</br>The NRC Senior Resident has been notified.</br>* * * UPDATE ON 8/1/24 AT 1925 EDT FROM CHASE WILLIAMS TO ADAM KOZIOL * * *</br>A clarification for reactor recirculation valve isolation above - the flow path was administratively isolated prior to the event. </br>After further evaluation it has been confirmed that the containment isolations were not caused due to any actual plant conditions or system parameters that satisfied the requirements for isolation. The isolations were a result of loss of power to the RPS 'B' bus and therefore are not considered valid actuations.</br>As indicated in 10 CFR 50.73(a)(1), in the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv)(A), the licensee may, at its option, provide a telephonic notification to the NRC Operations Center within 60 days of discovery of the event instead of submitting a written licensee event report. This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) for invalid actuations reported under 10 CFR 50.73(a)(2)(iv)(A).</br>Notified R4DO (Werner)50.73(a)(2)(iv)(A).
Notified R4DO (Werner) +
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, 1 August 2024 +
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>.
11:20:05, 2 August 2024 +
19:27:00, 5 June 2024 +
true +
false +
0.615 d (14.77 hours, 0.0879 weeks, 0.0202 months) +
04:41:00, 5 June 2024 +
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.