ENS 42674
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ENS Event | |
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13:19 Jun 30, 2006 | |
Title | Main Steam Isolation Valve Stuck During Testing |
Event Description | [On June 30, 2006 the licensee initiated] a plant shutdown required by Technical Specifications. [The licensee] discovered during surveillance testing, that the Unit 1 Main Steam Isolation Valve (MSIV-3370B) for the B-loop, would not return to the fully open condition after the partial stroke test. The valve appeared to stroke smoothly to the test position. Trouble shooting of the condition has not determined the exact cause however it appears that there is possible binding.
The licensee has tried reasonable methods to free the valve but was unable to do so. The licensee declared the MSIV inoperable. The plant's Technical Specifications require a shutdown within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with one MSIV inoperable. The licensee has no other safety significant limiting conditions for operation in effect. The safety related electrical buses are powered from offsite power and the grid is stable in the area. The licensee notified the NRC Resident Inspector. |
Where | |
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Farley ![]() Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
Time - Person (Reporting Time:+-3.6 h-0.15 days <br />-0.0214 weeks <br />-0.00493 months <br />) | |
Opened: | Chuck Barefield 09:43 Jun 30, 2006 |
NRC Officer: | Pete Snyder |
Last Updated: | Jun 30, 2006 |
42674 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (98 %) |
WEEKMONTHYEARENS 523742016-11-18T00:59:00018 November 2016 00:59:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Initiated ENS 510472015-05-07T10:09:0007 May 2015 10:09:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Shutdown Due to Reactor Coolant Pump Trip ENS 497152014-01-11T17:00:00011 January 2014 17:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Required by Technical Specifications ENS 481402012-07-27T02:51:00027 July 2012 02:51:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown for Diesel Maintenance Exceeding Allowed Outage Time ENS 461752010-08-15T05:45:00015 August 2010 05:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Ts Required Shutdown Entered Due to High Containment Temperature ENS 443582008-07-22T01:58:00022 July 2008 01:58:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Loss of Accident Mitigation Capabilities Due to Two Emergency Diesel Generators Out of Service ENS 426742006-06-30T13:19:00030 June 2006 13:19:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Main Steam Isolation Valve Stuck During Testing 2016-11-18T00:59:00 | |
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