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ENS 56278
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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 +  and 10 CFR 50.72#b2ivB +
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>On December 16, 2022 at 2351 CST, with the Unit in Mode 1 at 13 percent power, a manual scram was inserted due to lowering Reactor Pressure Vessel (RPV) pressure, which occurred following an unexpected opening of Main Turbine Bypass Valve 1. All control rods fully inserted. Following actuation of the manual scram, RPV pressure lowered, resulting in an automatic Primary Containment lsolation (PCIS) Group 1 isolation (expected response). The main steam isolation valves and steam line drain valves all closed. The Group 1 (isolation) has been reset allowing RPV pressure control with steam line drains to the main condenser.</br>All systems responded as designed. The plant is stable in Mode 3. Investigation of the bypass valve opening is ongoing.</br>This event is reportable under 10 CFR 50.72(b)(2)(iv)(B) RPS Actuation and 50.72(b)(3)(iv)(A) Specified System Actuation.</br>There was no impact on health and safety of the public or plant personnel. The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
Discovered date
05:51:00, 17 December 2022  +
ENS id number
56,278  +
Emergency class
Non Emergency +
Entered date
04:03:00, 17 December 2022  +
Event date
05:51:00, 17 December 2022  +
Event description
The following information was provided by … The following information was provided by the licensee via email:</br>On December 16, 2022 at 2351 CST, with the Unit in Mode 1 at 13 percent power, a manual scram was inserted due to lowering Reactor Pressure Vessel (RPV) pressure, which occurred following an unexpected opening of Main Turbine Bypass Valve 1. All control rods fully inserted. Following actuation of the manual scram, RPV pressure lowered, resulting in an automatic Primary Containment lsolation (PCIS) Group 1 isolation (expected response). The main steam isolation valves and steam line drain valves all closed. The Group 1 (isolation) has been reset allowing RPV pressure control with steam line drains to the main condenser.</br>All systems responded as designed. The plant is stable in Mode 3. Investigation of the bypass valve opening is ongoing.</br>This event is reportable under 10 CFR 50.72(b)(2)(iv)(B) RPS Actuation and 50.72(b)(3)(iv)(A) Specified System Actuation.</br>There was no impact on health and safety of the public or plant personnel. The NRC Senior Resident Inspector has been notified.nior 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 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +, ENS 56278 +  and ENS 56278 +
Initial power
13  +
Initial reactor mode
Power Operation +
LER
05000298/LER-2022-004-01, 1 for Cooper Nuclear Station, Manual Reactor Scram and Group I Isolation Due to Main Turbine Bypass Valve Failing Open +, 05000298/LER-2022-004, Manual Reactor Scram and Group I Isolation Due to Main Turbine Bypass Valve Failing Open +, Manual Reactor Scram and Group I Isolation Due to Main Turbine Bypass Valve Failing Open +  and 1 for Cooper Nuclear Station +
Last update date
00:00:00, 17 December 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>.
20:00:02, 4 January 2024  +
NRC officer
Lloyd Desotell +
Notification date
04:03:00, 17 December 2022  +
Originated by
Aric Harris +
Reactor critical
true  +
Reactor scram
true  +
Reactor type
GE-4 +
Region
NRC Region 4 +
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
-0.075 d (-1.8 hours, -0.0107 weeks, -0.00247 months)  +
Scram
Manual Scram +
Site
Cooper +
Start date
05:51:00, 17 December 2022  +
State
Nebraska +
System
Main Steam Isolation Valve +, Primary containment +, Reactor Pressure Vessel +, Main Condenser +  and Control Rod +
Title
Manual Reactor Scram  +
Turbine component
Turbine bypass valve +
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/2022/20221219en.html#en56278  +
Unit
1  +
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