ENS 47147
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ENS Event | |
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20:31 Aug 11, 2011 | |
Title | Loss of Intake Cooling Water for 20 Minutes |
Event Description | At 1631 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.205955e-4 months <br /> 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 hours0.0191 days <br />0.459 hours <br />0.00273 weeks <br />6.282055e-4 months <br />.
Presently, Unit 3 is in Mode 1 at 100% power with all systems stable. 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. The licensee notified the NRC Resident Inspector. |
Where | |
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Turkey Point Florida (NRC Region 2) | |
Reporting | |
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 | |
LER: | 05000250/LER-2011-002 |
Time - Person (Reporting Time:+0.6 h0.025 days <br />0.00357 weeks <br />8.2188e-4 months <br />) | |
Opened: | Nicholas Desantis 21:07 Aug 11, 2011 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Aug 11, 2011 |
47147 - NRC Website
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Unit 3 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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