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ENS 53788
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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(b)(2)(iv)(A), System Actuation - ECCS Discharge +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
EN Revision Text: MANUAL REACTOR SCRAM DUE … EN Revision Text: MANUAL REACTOR SCRAM DUE TO FAILED OPEN TURBINE BYPASS VALVE</br>At 1351 CST, the reactor was manually shutdown due to 'A' Turbine Bypass Valve opening. The Main Steam Line Isolation Valves were manually closed to facilitate reactor pressure control. Reactor level is being maintained through the use of Reactor Core Isolation Cooling System, Control Rod Drive System, and High Pressure Core Spray System. High Pressure Core Spray System was manually started to initially support reactor water level control. Reactor Pressure is being controlled through the use of the Safety Relief Valves and the Reactor Core Isolation Cooling System. The plant is stable in MODE 3.</br>The cause of the 'A' Turbine Bypass Valve opening is under investigation at this time.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE ON 12/14/18 AT 1140 EST FROM GERRY ELLIS TO TOM KENDZIA * * *</br>This is an update to EN # 53788 to correct an error on the event classification block of the form. The original notification did not have the block for 8 hour notification for Specified System Actuation checked. The actuation of Reactor Core Isolation Cooling System was discussed in original notification.</br>The licensee notified the NRC Resident Inspector.</br>Notified R4DO (Taylor).esident Inspector. Notified R4DO (Taylor).  +
Discovered date
06:00:00, 12 December 2018  +
ENS
ENS 53788 +
ENS id number
53,788  +
Emergency class
Non Emergency +
Entered date
17:29:00, 12 December 2018  +
Event date
06:00:00, 12 December 2018  +
Event description
EN Revision Text: MANUAL REACTOR SCRAM DUE … EN Revision Text: MANUAL REACTOR SCRAM DUE TO FAILED OPEN TURBINE BYPASS VALVE</br>At 1351 CST, the reactor was manually shutdown due to 'A' Turbine Bypass Valve opening. The Main Steam Line Isolation Valves were manually closed to facilitate reactor pressure control. Reactor level is being maintained through the use of Reactor Core Isolation Cooling System, Control Rod Drive System, and High Pressure Core Spray System. High Pressure Core Spray System was manually started to initially support reactor water level control. Reactor Pressure is being controlled through the use of the Safety Relief Valves and the Reactor Core Isolation Cooling System. The plant is stable in MODE 3.</br>The cause of the 'A' Turbine Bypass Valve opening is under investigation at this time.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE ON 12/14/18 AT 1140 EST FROM GERRY ELLIS TO TOM KENDZIA * * *</br>This is an update to EN # 53788 to correct an error on the event classification block of the form. The original notification did not have the block for 8 hour notification for Specified System Actuation checked. The actuation of Reactor Core Isolation Cooling System was discussed in original notification.</br>The licensee notified the NRC Resident Inspector.</br>Notified R4DO (Taylor).esident Inspector. Notified R4DO (Taylor).  +
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 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +, ENS 53788 +  and ENS 53788 +
Hours
9.259259e-5 d (0.00222 hours, 1.322751e-5 weeks, 3.044e-6 months)  +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 14 December 2018  +
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>.
12:30:11, 17 December 2018  +
NRC officer
Joanna Bridge +
Notification date
17:29:00, 12 December 2018  +
Originated by
Gerry Ellis +
Reactor critical
true  +
Reactor scram
true  +
Region
NRC Region 4 +
Reporting criterion
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(b)(2)(iv)(A), System Actuation - ECCS Discharge +
Reporting time
0.478 d (11.48 hours, 0.0683 weeks, 0.0157 months)  +
Scram
Manual Scram +
Site
Grand Gulf +
Start date
06:00:00, 12 December 2018  +
State
Mississippi +
System
Reactor Core Isolation Cooling +, High Pressure Core Spray +, Main Steam Line +, Safety Relief Valve +  and Control Rod +
Title
En Revision Imported Date 12/17/2018  +
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/2018/20181217en.html#en53788  +
Unit
1  +
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