ENS 47454

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v t e ENS Event
20:15 Nov 17, 2011
Title	Technical Specification Required Shutdown Due to Inoperable Feedwater Check Valve
Event Description	On Thursday, November 17, 2011, at 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br />, with the reactor at approximately 50% core thermal power, the station entered a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 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 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per TS 3.7.A.5. Currently, preparations are being completed to conduct the reactor shutdown and to initiate check valve repairs. This event had no impact on the health and safety of the public. The USNRC Senior Resident Inspector was onsite and has been notified. The electrical lineup is normal and all safety related equipment required for shutdown and cooldown are operable.

ENS 47454 +/-
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
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v • d • e

v t e Emergency Notification System
Pilgrim with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2013-01-21T01:50:00 [Table view]
[ENS list for Pilgrim]

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