ENS Event | |
|---|---|
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 | |
|---|---|
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
Loading map... | |
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
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