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ENS 47460
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release +, 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 Shutdown +
Description
While performing a regularly scheduled Tur … While performing a regularly scheduled Turbine Bypass Valve surveillance, prior to Turbine Bypass Valve movement, a 'B' half scram (signal) was received. Operators immediately suspended testing. Approximately 10 seconds later, a full Reactor Protection System actuation occurred. Following the reactor scram, reactor water level lowered below the Group II isolation initiation setpoint of +9 inches, (resulting in containment valve isolations). There were no radioactive releases associated with this event.</br>No other alarms were received prior to the RPS actuation. The cause of the reactor scram is under investigation at this time.</br>Also, due to the reactor scram, discharge canal temperature rate of change exceeded plant requirements. As a result, the State of Minnesota, and appropriate local agencies will be notified.</br>All control rods inserted and the scram is considered uncomplicated. The plant is in a normal shutdown electrical configuration.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
05:12:00, 20 November 2011  +
ENS id number
47,460  +
Emergency class
Non Emergency +
Entered date
02:10:00, 20 November 2011  +
Event date
05:12:00, 20 November 2011  +
Event description
While performing a regularly scheduled Tur … While performing a regularly scheduled Turbine Bypass Valve surveillance, prior to Turbine Bypass Valve movement, a 'B' half scram (signal) was received. Operators immediately suspended testing. Approximately 10 seconds later, a full Reactor Protection System actuation occurred. Following the reactor scram, reactor water level lowered below the Group II isolation initiation setpoint of +9 inches, (resulting in containment valve isolations). There were no radioactive releases associated with this event.</br>No other alarms were received prior to the RPS actuation. The cause of the reactor scram is under investigation at this time.</br>Also, due to the reactor scram, discharge canal temperature rate of change exceeded plant requirements. As a result, the State of Minnesota, and appropriate local agencies will be notified.</br>All control rods inserted and the scram is considered uncomplicated. The plant is in a normal shutdown electrical configuration.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +, ENS 47460 +  and ENS 47460 +
Initial power
90  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 20 November 2011  +
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>.
22:26:27, 24 September 2017  +
NRC officer
Vince Klco +
Notification date
02:10:00, 20 November 2011  +
Originated by
Mark Ihlenfeldt +
Reactor critical
true  +
Reactor type
GE-3 +
Region
NRC Region 3 +
Reporting criterion
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release +, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation +  and 10 CFR 50.72(b)(3)(iv)(A), System Actuation +
Reporting time
-0.126 d (-3.03 hours, -0.018 weeks, -0.00415 months)  +
Scram
Automatic Scram +
Site
Monticello +
Start date
05:12:00, 20 November 2011  +
State
Minnesota +
System
Reactor Protection System +  and Control Rod +
Title
Automatic Reactor Scram While Performing Turbine Bypass Valve Testing  +
Topic
Half scram +
Turbine component
Turbine bypass valve +
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/2011/20111121en.html#en47460  +
Unit
1  +
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