ISA-RP67.04.02-2010 Methodologies for the Determination of Setpoints for Nuclear Safety-Related Instrumentation

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This recommended practice provides guidance for the implementation of ANSI/ISA-67.04.01-
2006 in the following areas:

a) Methodologies, including sample equations to calculate total channel uncertainty;
b) Common assumptions and practices in instrument uncertainty calculations;
c) Equations for estimating uncertainties for commonly used analog and digital modules;
d) Methods to determine the impact of commonly encountered effects on instrument uncertainty;
e) Application of instrument channel uncertainty in setpoint determination;
f) Sources and interpretation of data for uncertainty calculations;
g) Discussion of the interface between setpoint determination and plant operating procedures,
calibration procedures, and accident analysis;
h) Documentation requirements.