Pilgrim Nuclear Plant, NRC ENR 01222013, SRV Inoperable
Channel: rumorecurioso
Date: 2013-01-24

http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130122en.html

http://en.wikipedia.org/wiki/Pilgrim_Nuclear_Generating_Station

TECHNICAL SPECIFICATION (TS) REQUIRED SHUTDOWN - SAFETY RELIEF VALVE DECLARED INOPERABLE 

"On Sunday, January 20, 2013, at 2050 hours, 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 hours 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."

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NUCLEAR EDUCATION & AWARENESS:
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Stop Nuclear Welfare
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An American Nuclear Tragedy: A Little Known Nuclear Facility in Paducah, Kentucky
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Going Nuclear: What is the Future of Nuclear Energy in the U.S.? (Arnie Gundersen on Aljazeera)
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Internal vs. External Radiation Exposure Explained (Arnie Gundersen)
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Nuclear 101 - Advantages & Disadvantages of Splitting Atoms to Boil Water
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