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ENS 52725
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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 May 2nd, 2017, at 1945 EDT, Watts Bar N … On May 2nd, 2017, at 1945 EDT, Watts Bar Nuclear (WBN) Plant Unit 1 reactor was manually tripped due to a failure of the #3 Reactor Coolant Pump normal feeder breaker to close during the planned power transfer to unit power following startup. 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 1 is in a normal shutdown electrical alignment.</br>This reactor trip and system actuation 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 2.</br>The NRC Senior Resident (Inspector) has been notified.or Resident (Inspector) has been notified.  +
Discovered date
23:45:00, 2 May 2017  +
ENS id number
52,725  +
Emergency class
Non Emergency +
Entered date
22:33:00, 2 May 2017  +
Equipment trip
Reactor Trip +
Event date
23:45:00, 2 May 2017  +
Event description
On May 2nd, 2017, at 1945 EDT, Watts Bar N … On May 2nd, 2017, at 1945 EDT, Watts Bar Nuclear (WBN) Plant Unit 1 reactor was manually tripped due to a failure of the #3 Reactor Coolant Pump normal feeder breaker to close during the planned power transfer to unit power following startup. 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 1 is in a normal shutdown electrical alignment.</br>This reactor trip and system actuation 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 2.</br>The NRC Senior Resident (Inspector) has been notified.or Resident (Inspector) has been notified.  +
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ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +, ENS 52725 +  and ENS 52725 +
Initial power
26  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 2 May 2017  +
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>.
01:42:47, 2 March 2018  +
NRC officer
Dong Park +
Notification date
22:33:00, 2 May 2017  +
Originated by
Bill Sprinkle +
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
-0.05 d (-1.2 hours, -0.00714 weeks, -0.00164 months)  +
Scram
Manual Scram +
Site
Watts Bar +
Start date
23:45:00, 2 May 2017  +
State
Tennessee +
System
Auxiliary Feedwater +, Decay Heat Removal +  and Main Steam +
Title
Manual Reactor Trip Due to Failed Reactor Coolant Pump Power Transfer  +
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/2017/20170503en.html#en52725  +
Unit
1  +
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