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ENS 47147
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +  and 10 CFR 50.72#b3vB +
Current power
100  +
Current reactor mode
Power Operation +
Description
At 1631 hours on Thursday, August 11, 2011 … At 1631 hours on Thursday, August 11, 2011, Turkey Point Unit 3 lost the function of the Intake Cooling Water (ICW) System for approximately 20 minutes. This is reportable in accordance with 10 CFR 50.72(b)(3)(v)(B) and (D). Loss of function occurred when manual valve 3-50-406, ICW/Component Cooling Water (CCW) Heat Exchanger Outlet Valve, failed closed. Valve 3-50-406 is located in the common discharge line preventing flow through both ICW headers to the CCW heat exchangers. Operations Department personnel opened the bypass valves associated with the failed valve and restored ICW flow to the CCW heat exchangers at approximately 1651 hours. </br>Presently, Unit 3 is in Mode 1 at 100% power with all systems stable.</br>The failed valve is a manual 24" butterfly valve. The bypass valve can maintain full flow. During this event, Operations personnel monitored CCW temperature. Unit 3 briefly entered T.S. 3.0.3 before restoring flow using the bypass. A high RCP temperature alarm was received following the momentary loss of ICW flow. The valve failure was accompanied with a loud bang. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
Discovered date
20:31:00, 11 August 2011  +
ENS id number
47,147  +
Emergency class
Non Emergency +
Entered date
21:07:00, 11 August 2011  +
Event date
20:31:00, 11 August 2011  +
Event description
At 1631 hours on Thursday, August 11, 2011 … At 1631 hours on Thursday, August 11, 2011, Turkey Point Unit 3 lost the function of the Intake Cooling Water (ICW) System for approximately 20 minutes. This is reportable in accordance with 10 CFR 50.72(b)(3)(v)(B) and (D). Loss of function occurred when manual valve 3-50-406, ICW/Component Cooling Water (CCW) Heat Exchanger Outlet Valve, failed closed. Valve 3-50-406 is located in the common discharge line preventing flow through both ICW headers to the CCW heat exchangers. Operations Department personnel opened the bypass valves associated with the failed valve and restored ICW flow to the CCW heat exchangers at approximately 1651 hours. </br>Presently, Unit 3 is in Mode 1 at 100% power with all systems stable.</br>The failed valve is a manual 24" butterfly valve. The bypass valve can maintain full flow. During this event, Operations personnel monitored CCW temperature. Unit 3 briefly entered T.S. 3.0.3 before restoring flow using the bypass. A high RCP temperature alarm was received following the momentary loss of ICW flow. The valve failure was accompanied with a loud bang. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.  +
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ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +, ENS 47147 +  and ENS 47147 +
Hours
0.0189 d (0.453 hours, 0.0027 weeks, 6.205955e-4 months)  +  and 0.0191 d (0.459 hours, 0.00273 weeks, 6.282055e-4 months)  +
Initial power
100  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 11 August 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>.
02:06:21, 2 March 2018  +
NRC officer
Mark Abramovitz +
Notification date
21:07:00, 11 August 2011  +
Originated by
Nicholas Desantis +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
Westinghouse PWR 3-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +  and 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +
Reporting time
0.025 d (0.6 hours, 0.00357 weeks, 8.2188e-4 months)  +
Site
Turkey Point +
Start date
20:31:00, 11 August 2011  +
State
Florida +
Title
Loss of Intake Cooling Water for 20 Minutes  +
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/2011/20110812en.html#en47147  +
Unit
3  +
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