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ENS 57779
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +, 10 CFR 50.72#b2ivB +  and 10 CFR 50.72#b3ivA +
Current power
0  +
Description
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0351 EDT on 6/24/25, Sequoyah Unit 2 operators performed a manual reactor trip. All safety systems responded normally, and the plant is currently stable in mode 3 (hot standby) at normal operating temperature and pressure. Unit 2 was manually tripped due to lowering level in the loop 1 steam generator caused by main feedwater regulating valve malfunction.</br>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) and in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the auxiliary feedwater system.</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.  +
Discovered date
07:51:00, 24 June 2025  +
ENS id number
57,779  +
Emergency class
Non Emergency +
Entered date
05:16:00, 24 June 2025  +
Equipment trip
Reactor Trip +
Event date
07:51:00, 24 June 2025  +
Event description
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 0351 EDT on 6/24/25, Sequoyah Unit 2 operators performed a manual reactor trip. All safety systems responded normally, and the plant is currently stable in mode 3 (hot standby) at normal operating temperature and pressure. Unit 2 was manually tripped due to lowering level in the loop 1 steam generator caused by main feedwater regulating valve malfunction.</br>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) and in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the auxiliary feedwater system.</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.  +
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>.
ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +, ENS 57779 +  and ENS 57779 +
Initial power
100  +
Last update date
00:00:00, 24 June 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>.
11:20:05, 26 June 2025  +
NRC officer
Ernest West +
Notification date
05:16:00, 24 June 2025  +
Originated by
Craig Youngblood +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.108 d (-2.58 hours, -0.0154 weeks, -0.00353 months)  +
Scram
Manual Scram +
Site
Sequoyah +
Start date
07:51:00, 24 June 2025  +
State
Tennessee +
System
Steam Generator +, Feedwater +, Reactor Protection System +  and Auxiliary Feedwater +
Title
Unit 2 Manual Reactor Trip  +
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.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250626en.html#en57779  +
Unit
2  +
 
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