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ENS 56216
Show incoming properties 
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  +
Current reactor mode
Hot Standby +
Description
The following information was provided by … The following information was provided by the licensee via email:</br>At 0744 EST on November 10, 2022, DC Cook Unit 2 tripped automatically on high-high level of number 23 steam generator (SG). The reason for the high-high level in SG 23 is under investigation.</br>This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. The DC Cook NRC Resident Inspector has been notified.</br>Unit 2 is being supplied by offsite power. All control rods fully inserted. All Auxiliary Feedwater Pumps started properly. Decay heat is being removed via the Steam Dump System. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip. DC Cook Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event. is in progress as a result of this event.  +
Discovered date
12:44:00, 10 November 2022  +
Emergency class
Non Emergency +
Entered date
10:12:00, 10 November 2022  +
Equipment trip
Reactor Trip +
Event date
12:44:00, 10 November 2022  +
Event description
The following information was provided by … The following information was provided by the licensee via email:</br>At 0744 EST on November 10, 2022, DC Cook Unit 2 tripped automatically on high-high level of number 23 steam generator (SG). The reason for the high-high level in SG 23 is under investigation.</br>This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. The DC Cook NRC Resident Inspector has been notified.</br>Unit 2 is being supplied by offsite power. All control rods fully inserted. All Auxiliary Feedwater Pumps started properly. Decay heat is being removed via the Steam Dump System. Preliminary evaluation indicates all plant systems functioned normally following the reactor trip. DC Cook Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event. is in progress as a result of this event.  +
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 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +, ENS 56216 +  and ENS 56216 +
Initial power
44  +
Initial reactor mode
Power Operation +
LER
05000316/LER-2022-001, Automatic Reactor Trip Due to Steam Generator High-High Level +  and Automatic Reactor Trip Due to Steam Generator High-High Level +
Last update date
00:00:00, 10 November 2022  +
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>.
20:00:18, 4 January 2024  +
NRC officer
Adam Koziol +
Notification date
10:12:00, 10 November 2022  +
Originated by
Ted Dey +
Reactor critical
true  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 3 +
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
-0.105 d (-2.53 hours, -0.0151 weeks, -0.00347 months)  +
Scram
Automatic Scram +
Site
Cook +
Start date
12:44:00, 10 November 2022  +
State
Michigan +
System
Steam Generator +, Reactor Protection System +, Auxiliary Feedwater +  and Control Rod +
Title
Automatic Reactor Trip and Auxiliary Feedwater System Actuation  +
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/2022/20221114en.html#en56216  +
Unit
2  +
 
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