Operational calculations and prediction of dynamic poisoning in WWER type reactors

A computer code for calculation of the varying poisoning parameters is proposed. It presents the dynamics of 135Xe effect on the base of initial conditions given interactively by the operator. The main module of the code solves a system of differential equations describing the dynamic effect of 135Xe and its predecessor 135I. An essential assumption has been made in the mathematical model that the neutron flux density is proportional to the heat power and it does not depend on the effective days of reactor operation. The code enables prediction of the dynamic poisoning during 500 h period of time. It can also be used for studying the influence of separate factors on the dynamics of 135Xe and 149Sm poisoning, accumulating the pseudo-fission and saturation products, calculating the control assemblies critical level, for personnel training, etc. 3 figs, 3 refs