EXCEL has the industry’s most experienced instrument uncertainty and setpoint calculation personnel. EXCEL has supported the development of Setpoint Methodologies, Setpoint Calculations and Setpoint Control programs. EXCEL was a key participant in program development for implementation of TSTF-493 Rev 4 Option A and Option B. EXCEL also actively participates in the continuing support and revision of ISA 67 series standards and recommended practices, regarding instrument uncertainty and setpoint analysis methodologies. EXCEL is also one of the most experienced companies in instrumentation drift analysis, as-found/as-left analysis of instrument performance to validate setpoint calculation assumptions, providing trending information and providing input to surveillance extension activities. EXCEL continues to provide instrument uncertainty and setpoint calculation production and revision for BWRs and PWRs, to support small and large scale equipment replacements and programmatic changes, as necessary.