ENS 47454: Difference between revisions
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| event date = 11/17/2011 15:15 EST | | event date = 11/17/2011 15:15 EST | ||
| last update date = 11/17/2011 | | last update date = 11/17/2011 | ||
| title = Technical Specification Required Shutdown Due | | title = Technical Specification Required Shutdown Due to Inoperable Feedwater Check Valve | ||
| event text = On Thursday, November 17, 2011, at 1515 hours, with the reactor at approximately 50% core thermal power, the station entered a 24 hour cold shutdown action statement due to the inability to provide a manual isolation for a main feedwater line check valve that had been declared inoperable due to a leak. As background, the reactor was at reduced power in order to perform a planned main condenser thermal backwash. While at reduced power an inspection of the main steam tunnel (a normally locked closed high radiation area) was performed as part of a scheduled system inspection. The inspection identified a leak on the feedwater line 'B' outboard check valve (6-CK-62B). The feedwater check valve was declared inoperable and the Limiting Condition for Operation (LCO) for Technical Specification (TS) 3.7.A.2.a.5 was entered. Because there is no ability to manually isolate the primary containment penetration the station is required to be in cold shutdown within 24 hours per TS 3.7.A.5. | | event text = On Thursday, November 17, 2011, at 1515 hours, with the reactor at approximately 50% core thermal power, the station entered a 24 hour cold shutdown action statement due to the inability to provide a manual isolation for a main feedwater line check valve that had been declared inoperable due to a leak. As background, the reactor was at reduced power in order to perform a planned main condenser thermal backwash. While at reduced power an inspection of the main steam tunnel (a normally locked closed high radiation area) was performed as part of a scheduled system inspection. The inspection identified a leak on the feedwater line 'B' outboard check valve (6-CK-62B). The feedwater check valve was declared inoperable and the Limiting Condition for Operation (LCO) for Technical Specification (TS) 3.7.A.2.a.5 was entered. Because there is no ability to manually isolate the primary containment penetration the station is required to be in cold shutdown within 24 hours per TS 3.7.A.5. | ||
Currently, preparations are being completed to conduct the reactor shutdown and to initiate check valve repairs. | Currently, preparations are being completed to conduct the reactor shutdown and to initiate check valve repairs. | ||
Latest revision as of 21:05, 1 March 2018
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-2.25 h-0.0938 days <br />-0.0134 weeks <br />-0.00308 months <br />) | |
| Opened: | Mert Probasco 18:00 Nov 17, 2011 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Nov 17, 2011 |
| 47454 - NRC Website
| |