ENS 47497
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ENS Event | |
---|---|
13:47 Dec 5, 2011 | |
Title | Discovery of After-The-Fact Emergency Condition - Unusual Event |
Event Description | At approximately 0847 EST, Unit 1 Letdown Pressure Control Valve, 1-CH-PCV-1145, began acting erratically which resulted in the Letdown Relief Valve, 1-CH-RV-1203, lifting and flowing to the Pressurizer Relief Tank.
At 0848 EST, the relief valve reseated and the leakage stopped. Approximately 42 gpm leakage resulted from the relief valve lifting. This identified flow rate exceeded the threshold for entry into a Notice of Unusual Event under EAL tab SU6.1 due to identified leakage greater than 25 gpm. The licensee is troubleshooting the Letdown Pressure Control Valve. The licensee notified the NRC Resident Inspector and will notify State and local agencies. |
Where | |
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North Anna ![]() Virginia (NRC Region 2) | |
Reporting | |
Other Unspec Reqmnt | |
Time - Person (Reporting Time:+-4.2 h-0.175 days <br />-0.025 weeks <br />-0.00575 months <br />) | |
Opened: | Don Taylor 09:35 Dec 5, 2011 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Dec 5, 2011 |
47497 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 474972011-12-05T13:47:0005 December 2011 13:47:00
[Table view]Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition - Unusual Event ENS 466972011-03-24T18:00:00024 March 2011 18:00:00 Other Unspec Reqmnt Non-Compliance with Nuhoms Technical Specification ENS 461532010-08-05T17:55:0005 August 2010 17:55:00 Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition Meeting Unusual Event Criteria ENS 454602009-10-23T20:34:00023 October 2009 20:34:00 Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Due to Excess Letdown Heat Exchanger Tube Leak and After-The-Fact Unusual Event ENS 450132009-04-22T09:00:00022 April 2009 09:00:00 Other Unspec Reqmnt Discovery of After-The-Fact Emergency Condition - Alert - Due to Fire Damage to Safety-Related Breaker ENS 403282003-11-17T16:50:00017 November 2003 16:50:00 Other Unspec Reqmnt Significant Leak in Fire Protection Header 2011-03-24T18:00:00 | |
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