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ENS 52194
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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  +
Current reactor mode
Hot Standby +
Description
On August 23, 2016, at 1356 EDT, Watts Bar … On August 23, 2016, at 1356 EDT, Watts Bar Nuclear Plant (WBN) Unit 2 reactor was manually tripped due to a loss of main feedwater.</br>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 main steam dump systems. Unit 2 is in a normal shutdown electrical alignment.</br>The cause is currently under investigation.</br>This is being reported under 10CFR 50.72(b)(3)(iv)(A) and 10CFR 50.72(b)(2)(iv)(B).</br>There was no effect on WBN Unit 1.</br>The NRC Senior Resident Inspector has been notified.nior Resident Inspector has been notified.  +
Discovered date
17:56:00, 23 August 2016  +
ENS id number
52,194  +
Emergency class
Non Emergency +
Entered date
15:30:00, 23 August 2016  +
Equipment trip
Reactor Trip +
Event date
17:56:00, 23 August 2016  +
Event description
On August 23, 2016, at 1356 EDT, Watts Bar … On August 23, 2016, at 1356 EDT, Watts Bar Nuclear Plant (WBN) Unit 2 reactor was manually tripped due to a loss of main feedwater.</br>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 main steam dump systems. Unit 2 is in a normal shutdown electrical alignment.</br>The cause is currently under investigation.</br>This is being reported under 10CFR 50.72(b)(3)(iv)(A) and 10CFR 50.72(b)(2)(iv)(B).</br>There was no effect on WBN Unit 1.</br>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 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +, ENS 52194 +  and ENS 52194 +
Initial power
43  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 23 August 2016  +
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>.
01:44:21, 2 March 2018  +
NRC officer
Jeff Herrera +
Notification date
15:30:00, 23 August 2016  +
Originated by
David Allen +
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
-0.101 d (-2.43 hours, -0.0145 weeks, -0.00333 months)  +
Scram
Manual Scram +
Site
Watts Bar +
Start date
17:56:00, 23 August 2016  +
State
Tennessee +
System
Feedwater +, Auxiliary Feedwater +, Decay Heat Removal +  and Main Steam +
Title
Manual Trip Due to a Loss of Main Feedwater  +
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.
http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2016/20160824en.html#en52194  +
Unit
2  +
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