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ENS 54077
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
On May 22, 2019, at 0233 EDT, Watts Bar Nu … On May 22, 2019, at 0233 EDT, Watts Bar Nuclear Plant (WBN) Unit 2 reactor was manually tripped due to a failure of the #2 Main Feedwater Regulating Valve during power ascension following a refueling outage. Concurrent with the reactor trip, the Auxiliary Feedwater system actuated as designed. </br>All Control and Shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via Auxiliary Feedwater and Steam Dumps. Unit 2 is in a normal shutdown electrical alignment. </br>This reactor trip and system actuation is being reported under 10 CFR 50.72(b)(3)(iv)(A) and 10 CFR 50.72(b)(2)(iv)(B). </br>There was no impact to WBN Unit 1. </br>The NRC Senior Resident has been notified.The NRC Senior Resident has been notified.  +
Discovered date
06:33:00, 22 May 2019  +
ENS id number
54,077  +
Emergency class
Non Emergency +
Entered date
05:45:00, 22 May 2019  +
Equipment trip
Reactor Trip +
Event date
06:33:00, 22 May 2019  +
Event description
On May 22, 2019, at 0233 EDT, Watts Bar Nu … On May 22, 2019, at 0233 EDT, Watts Bar Nuclear Plant (WBN) Unit 2 reactor was manually tripped due to a failure of the #2 Main Feedwater Regulating Valve during power ascension following a refueling outage. Concurrent with the reactor trip, the Auxiliary Feedwater system actuated as designed. </br>All Control and Shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via Auxiliary Feedwater and Steam Dumps. Unit 2 is in a normal shutdown electrical alignment. </br>This reactor trip and system actuation is being reported under 10 CFR 50.72(b)(3)(iv)(A) and 10 CFR 50.72(b)(2)(iv)(B). </br>There was no impact to WBN Unit 1. </br>The NRC Senior Resident has been notified.The NRC Senior Resident has been notified.  +
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ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +, ENS 54077 +  and ENS 54077 +
Initial power
95  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 22 May 2019  +
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>.
04:49:10, 24 February 2020  +
NRC officer
Jeffrey Whited +
Notification date
05:45:00, 22 May 2019  +
Originated by
Brian Mcilnay +
Reactor critical
true  +
Reactor scram
true  +
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
-0.0333 d (-0.8 hours, -0.00476 weeks, -0.0011 months)  +
Scram
Manual Scram +
Site
Watts Bar +
Start date
06:33:00, 22 May 2019  +
State
Tennessee +
System
Feedwater +, Auxiliary Feedwater +  and Decay Heat Removal +
Title
Manual Reactor Trip Due to Failure of Main Feedwater Regulating 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/2019/20190523en.html#en54077  +
Unit
2  +
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