Mathematical model of the primary coolant circuit hydrodynamic state under accidents with loss of coolant at NPPs with WWER type reactors

The KIPR program complex designed for calculational analysis of thermohydraulic processes in the primary coolant circuits of the WWER type reactor at the stage of after-heat removal in the case of an accident with loss of coolant, is briefly described. All technological equipment and physical processes are conventionally divided into groups, each of them being described by a separate functional modulus. When developing the mathematical model, the basic aspects of quasistationary method of coolant flow calculation are used. The coolant state is described using density and pressure values averaged over the volume