ENS 48685

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v t e ENS Event
01:50 Jan 21, 2013
Title	Technical Specification (Ts) Required Shutdown - Safety Relief Valve Declared Inoperable
Event Description	On Sunday, January 20, 2013, at 2050 hours0.0237 days <br />0.569 hours <br />0.00339 weeks <br />7.80025e-4 months <br />, with the reactor at 100% core thermal power, the station entered a 24-hour action statement to initiate a controlled shutdown and be less than 104 psig reactor pressure due to suspected leakage across the first stage pilot of safety relief valve (SRV) RV-203-3B and subsequent declaration of the SRV inoperable due to criteria specified in Pilgrim plant procedure 2.2.23. As background, the pressure relief system includes four (4) SRVs and two (2) spring safety valves (SSVs). The SRVs discharge through their individual discharge piping, terminating below the minimum suppression pool (torus) water level. The four SRVs are installed on the main steam piping in containment between the reactor pressure vessel and the flow restrictors. While at full power, indication of a steam leak across the first stage pilot of RV-203-3B was determined in accordance with criteria specified in procedure 2.2.23. Specifically, the SRV is inoperable if the pilot stage thermocouple temperature is 35 degrees F below its baseline temperature (with a lower decrease at the 2nd stage thermocouple) and cannot be explained by a corresponding downpower. The safety relief valve was subsequently declared inoperable and the Limiting Condition for Operation (LCO) for Technical Specification (TS) 3.6.D was entered. Due to the valve being declared inoperable the station is required to be shutdown and reactor coolant pressure below 104 psig within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per TS 3.6.D.2. Currently a reactor shutdown is in progress to initiate safety relief valve repairs. This event has no impact on the health and/or safety of the public. The USNRC Senior Resident Inspector has been notified.

ENS 48685 +/-
Where
Pilgrim Massachusetts (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
Time - Person (Reporting Time:+-2.33 h-0.0971 days <br />-0.0139 weeks <br />-0.00319 months <br />)
Opened:	Paul Gallant 23:30 Jan 20, 2013
NRC Officer:	Charles Teal
Last Updated:	Jan 20, 2013
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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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