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ENS 54012
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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 +  and 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge +
Current power
0  +
Current reactor mode
Hot Shutdown +
Description
At 0507 (CDT on April 20, 2019), the DAEC … At 0507 (CDT on April 20, 2019), the DAEC (Duane Arnold Energy Center) experienced a trip of both reactor feed pumps. Operators inserted a manual scram. All control rods inserted, as required. As a result of the feed pump trips and scram, HPCI and RCIC automatically injected. Also, containment isolations occurred, as expected for this event. All systems responded as designed.</br>Operators are currently taking the unit to cold shutdown conditions. Vessel level is being controlled by RCIC with Condensate System available. Pressure is being controlled using Main Steam Line drains and the Main Condenser is available.</br>Normal electrical lineup remains. The cause of the reactor feed pumps tripping is believed to be an instrument air leak to flow control valves, causing loss of suction to both feed pumps.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
10:07:00, 20 April 2019  +
Emergency class
Non Emergency +
Entered date
09:54:00, 20 April 2019  +
Event date
10:07:00, 20 April 2019  +
Event description
At 0507 (CDT on April 20, 2019), the DAEC … At 0507 (CDT on April 20, 2019), the DAEC (Duane Arnold Energy Center) experienced a trip of both reactor feed pumps. Operators inserted a manual scram. All control rods inserted, as required. As a result of the feed pump trips and scram, HPCI and RCIC automatically injected. Also, containment isolations occurred, as expected for this event. All systems responded as designed.</br>Operators are currently taking the unit to cold shutdown conditions. Vessel level is being controlled by RCIC with Condensate System available. Pressure is being controlled using Main Steam Line drains and the Main Condenser is available.</br>Normal electrical lineup remains. The cause of the reactor feed pumps tripping is believed to be an instrument air leak to flow control valves, causing loss of suction to both feed pumps.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +, ENS 54012 +  and ENS 54012 +
Initial power
100  +
Initial reactor mode
Power Operation +
LER
05000331/LER-2019-001, Manual Reactor Scram Due to Lowering Reactor Water Level +  and Manual Reactor Scram Due to Lowering Reactor Water Level +
Last update date
00:00:00, 20 April 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>.
11:30:15, 22 April 2019  +
NRC officer
Caty Nolan +
Notification date
09:54:00, 20 April 2019  +
Originated by
Stephen Spiers +
Reactor critical
true  +
Reactor scram
true  +
Region
NRC Region 3 +
Reporting criterion
10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +, 10 CFR 50.72(b)(3)(iv)(A), System Actuation +  and 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge +
Reporting time
-0.00917 d (-0.22 hours, -0.00131 weeks, -3.01356e-4 months)  +
Scram
Manual Scram +
Site
Duane Arnold +
Start date
10:07:00, 20 April 2019  +
State
Iowa +
System
Main Steam Line +, Main Condenser +  and Control Rod +
Title
Both Reactor Feed Pumps Trip Causing Manual Reactor Scram and Eccs Injection  +
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/2019/20190422en.html#en54012  +
Unit
1  +
 
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