Reproductive Properties of WWER-440 and WWER-SCWR When Used in a Closed Nuclear Fuel Cycle

A study of the reproducing properties of the active zone of a water-cooled WWER reactor with a supercritical coolant when used in a closed nuclear fuel cycle, in comparison with the same properties of the prototype – WWER-440 is considers. The relevance of the study is determined by the need to increase the efficiency, improve the characteristics of breeding fuel in existing projects of light water reactors. Comparative dynamics of the isotopic composition of SNF from operating WWERs and reactors cooled by supercritical pressure water is presented. In the course of this work, it was found that the spectral, multiplying, and reproducing properties of the WWER-440 and WWER reactor with a supercritical coolant converge as uranium is replaced by plutonium in the fuel during repeated recycling. In view of the fact that plutonium oxides are used as an energy source of energy for nuclear technology and fuel in nuclear reactors, therefore an analysis was made of the change of the plutonium isotopic composition during multiple recycling. It is shown that during fuel burnup the plutonium with a lower content of heavier isotopes is produced in supercritical watercooled reactor