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ENS 50278
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 July 13, 2014 at 1937 (EDT), Watts Bar … On July 13, 2014 at 1937 (EDT), Watts Bar Nuclear Plant Unit 1 reactor was manually tripped due to automatic isolation of all low pressure feedwater heaters. 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, steam dumps and the main condenser. The station 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>The NRC Senior Resident (Inspector) has been notified.</br>Initial indications are that a level switch failed on the #7 heater drain tank which caused the heater drain tank pumps to trip. When the high level tank setpoint was reached, the feedwater system isolated.as reached, the feedwater system isolated.  +
Discovered date
23:37:00, 13 July 2014  +
ENS id number
50,278  +
Emergency class
Non Emergency +
Entered date
23:13:00, 13 July 2014  +
Equipment trip
Reactor Trip +
Event date
23:37:00, 13 July 2014  +
Event description
On July 13, 2014 at 1937 (EDT), Watts Bar … On July 13, 2014 at 1937 (EDT), Watts Bar Nuclear Plant Unit 1 reactor was manually tripped due to automatic isolation of all low pressure feedwater heaters. 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, steam dumps and the main condenser. The station 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>The NRC Senior Resident (Inspector) has been notified.</br>Initial indications are that a level switch failed on the #7 heater drain tank which caused the heater drain tank pumps to trip. When the high level tank setpoint was reached, the feedwater system isolated.as reached, the feedwater system isolated.  +
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ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +, ENS 50278 +  and ENS 50278 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 13 July 2014  +
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>.
01:50:15, 2 March 2018  +
NRC officer
Mark Abramovitz +
Notification date
23:13:00, 13 July 2014  +
Originated by
Matthew Robertson +
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
-0.0167 d (-0.4 hours, -0.00238 weeks, -5.4792e-4 months)  +
Scram
Manual Scram +
Site
Watts Bar +
Start date
23:37:00, 13 July 2014  +
State
Tennessee +
System
Feedwater +, Auxiliary Feedwater +, Decay Heat Removal +  and Main Condenser +
Title
Manual Reactor Trip Due to Automatic Feedwater Heater Isolation  +
Topic
Feedwater Heater +
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/2014/20140714en.html#en50278  +
Unit
1  +
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