Simple EPR calculates a degree of sensitization to Intergranular Stress Corrosion Cracking in heat-affected stainless steels. This command is only available in the Reactivation Analysis package.
You can find a detailed description of the simplified reactivation test in A.P. Majidi and A. Streicher, "Non-Destructive Electrochemical Tests for Detecting Sensitization in ANSI 304 and 304L Stainless Steels," in Electrochemical Techniques for Corrosion Engineers, R. Baboian, ed. NACE, Houston, TX, USA, 1986.
The analysis for the Simple EPR test consists of measurement of the height of a current peak, and normalization of the current to either a standard grain size or to a grain-boundary area. The magnitude of the resulting normalized current is a direct measure of the degree of sensitization.