Static and dynamic sensitivity analysis of corrosion product activity in primary coolant circuits of pressurized water reactors

A CPAIR code (Deeba et al., 1999) based model has been developed for static and dynamic sensitivity analysis of the corrosion product activity (CPA) in primary circuits of pressurized water reactors (PWRs). This has been implemented in the Matlab program CPAIR-SA and carries out sensitivity analysis of CPA using both static as well as dynamic approaches. For steady state and constant corrosion rate operations, the predicted static value of the normalized sensitivity coefficients have been found in excellent agreement with the corresponding values found by the dynamic analysis. For saturated CPA values, the standard sensitivity coefficients have been found to yield dominant values for re-solution rate coefficients from scale in core and in piping Kc, Kp as −0.99652, 3.3882 × 10−3; for deposition rate coefficients on core scale and on piping, ɛcQcɛcQc, ɛpQpɛpQp as 0.99798, −8.5652 × 10−3; for removal rate coefficient by ion-exchanger ɛIQIɛIQI as −1.9998; for volume of primary coolant, volume of core scale and volume of piping scale, Vw, Vc, Vp as 1.0018, 0.99652 and −3.3882 × 10−3 respectively.