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ENS 44506
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Current power
0  +
Current reactor mode
Hot Standby +
Description
At 0906 EDT Watts Bar Unit 1 experienced a … At 0906 EDT Watts Bar Unit 1 experienced a Reactor trip in response to a Turbine trip. This caused an automatic AFW Pump start from P-4 coincident with Lo Tave signal. First indications are that the Exciter Field Breaker tripped open. The cause is under investigation. All ESF systems responded as designed with no other issues. The plant is currently stable and is being maintained in Mode 3. Plans for plant restart are pending awaiting the cause investigation.</br>All control rods fully inserted into the core. Plant decay heat removal is through the steam dumps to the main condenser. The offsite power is available and lined up to plant system loads. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
13:06:00, 20 September 2008  +
ENS id number
44,506  +
Emergency class
Non Emergency +
Entered date
11:30:00, 20 September 2008  +
Equipment trip
Turbine Trip +  and Reactor Trip +
Event date
13:06:00, 20 September 2008  +
Event description
At 0906 EDT Watts Bar Unit 1 experienced a … At 0906 EDT Watts Bar Unit 1 experienced a Reactor trip in response to a Turbine trip. This caused an automatic AFW Pump start from P-4 coincident with Lo Tave signal. First indications are that the Exciter Field Breaker tripped open. The cause is under investigation. All ESF systems responded as designed with no other issues. The plant is currently stable and is being maintained in Mode 3. Plans for plant restart are pending awaiting the cause investigation.</br>All control rods fully inserted into the core. Plant decay heat removal is through the steam dumps to the main condenser. The offsite power is available and lined up to plant system loads. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +, ENS 44506 +  and ENS 44506 +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 20 September 2008  +
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>.
02:13:35, 2 March 2018  +
NRC officer
Vince Klco +
Notification date
11:30:00, 20 September 2008  +
Originated by
Billy Johnson +
Reactor critical
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
-0.0667 d (-1.6 hours, -0.00952 weeks, -0.00219 months)  +
Site
Watts Bar +
Start date
13:06:00, 20 September 2008  +
State
Tennessee +
System
Decay Heat Removal +, Main Condenser +  and Control Rod +
Title
Reactor Trip Due to Turbine Trip  +
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/2008/20080922en.html#en44506  +
Unit
1  +
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