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On January 4, 2008, Calvert Cliffs Nuclear … On January 4, 2008, Calvert Cliffs Nuclear Power Plant received vendor confirmation that the temperature profile used to establish the As-Found Lift Setting for pressurizer safety valve 2RV200 (BV02950) in 2006 was not consistent with the temperature profile used to establish the valve's As-Left Lift Setting in 2003. As a result, the As-Found Lift Setting was outside the Technical Specification limits. Because 2RV200 had partially lifted during the November 16, 2006 Unit 2 reactor trip (Licensee Event Report 318/2006-001, Revision 1 dated February 23, 2007), the valve was removed and shipped to the vendor for As-Found testing and a complete refurbishment. Initially, the apparent cause evaluation determined that due to a loose compression screw/valve bonnet thread interface, thermal effects from the Unit 2 trip may have caused the lift setting to decrease during the event. However, a subsequent revision to the apparent cause evaluation determined that the low lift setting was caused by a difference in the temperature profiles. BV02950 was replaced with a valve set at the correct temperature profile.</br></br>All valves currently installed in Units 1 and 2 were verified to be set at the correct temperature profile. Procedures will be changed to reflect the effect of temperature changes on the setpoint and a checklist will be developed to track relief valve testing prior to installation.elief valve testing prior to installation. +
On January 4, 2008, Calvert Cliffs Nuclear … On January 4, 2008, Calvert Cliffs Nuclear Power Plant received vendor confirmation that the temperature profile used to establish the As-Found Lift Setting for pressurizer safety valve 2RV200 (BV02950) in 2006 was not consistent with the temperature profile used to establish the valve's As-Left Lift Setting in 2003. As a result, the As-Found Lift Setting was outside the Technical Specification limits. Because 2RV200 had partially lifted during the November 16, 2006 Unit 2 reactor trip (Licensee Event Report 318/2006-001, Revision 1 dated February 23, 2007), the valve was removed and shipped to the vendor for As-Found testing and a complete refurbishment. Initially, the apparent cause evaluation determined that due to a loose compression screw/valve bonnet thread interface, thermal effects from the Unit 2 trip may have caused the lift setting to decrease during the event. However, a subsequent revision to the apparent cause evaluation determined that the low lift setting was caused by a difference in the temperature profiles. BV02950 was replaced with a valve set at the correct temperature profile.</br></br>All valves currently installed in Units 1 and 2 were verified to be set at the correct temperature profile. Procedures will be changed to reflect the effect of temperature changes on the setpoint and a checklist will be developed to track relief valve testing prior to installation.elief valve testing prior to installation. +
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