ENS 49571
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ENS Event | |
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21:41 Nov 21, 2013 | |
Title | Low Casing Cooling System Tank Level Potentially Causes Loss of Npsh to Outside Recirculation Spray Pumps |
Event Description | The Casing Cooling system at North Anna Power Station (NAPS) Units 1 and 2 provides cold, borated water to the suction of the Outside Recirculation Spray (ORS) pumps to increase net positive suction head (NPSH) following the initiation of a Containment Depressurization Actuation (CDA). As Casing Cooling tank level decreases to the isolation setpoint, it has been determined that vortexing/air entrainment may occur. This air would then enter the suction of the ORS pumps and potentially cause degradation in design flow and/or loss of NPSH. As a result, this constitutes an event or condition that could have prevented fulfillment of a safety function and is reportable per 50.72(b)(3)(v). A prompt operability determination is in progress that should restore the function of the recirculation spray system.
The licensee has notified the NRC Resident Inspector. The licensee will be notifying the Louisa County Administration in the morning. |
Where | |
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North Anna ![]() Virginia (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+0 h0 days <br />0 weeks <br />0 months <br />) | |
Opened: | Bob Page 21:41 Nov 21, 2013 |
NRC Officer: | Jeff Rotton |
Last Updated: | Nov 21, 2013 |
49571 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
North Anna ![]() | |
WEEKMONTHYEARENS 514602015-10-08T01:47:0008 October 2015 01:47:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 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, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition High Energy Line Break Door Found Unlatched ENS 506662014-12-10T18:44:00010 December 2014 18:44:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Inadvertent Loss of Vital Indication During Maintenance ENS 495712013-11-21T21:41:00021 November 2013 21:41:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Low Casing Cooling System Tank Level Potentially Causes Loss of Npsh to Outside Recirculation Spray Pumps ENS 445812008-10-18T15:25:00018 October 2008 15:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Boron Injection Tank Inlet Valves Inoperable. ENS 407392004-05-10T00:05:00010 May 2004 00:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Unit 2 Emergency Diesels Declared Inoperable Due to Shims/Supports Found to Be Either Missing or Not Properly Fastened. 2015-10-08T01:47:00 | |
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