Abstract
This paper provides information on the development and validation of the MAVR-TA code. The MAVR-TA code is designed to simulate the fission products release from fuel and melt, and the transfer of fission products in the primary circuit and in the containment during a severe accident at NPP with VVER. The first part of the work provides information on the models of the MAVR-TA code, associated with modeling of the fission products release from the fuel. The paper provides information about description of the models and their approaches. In addition, it provides a description of the experimental tests, which were used to validate the models of the fission products release in the MAVR-TA code. As a result, the applicability of the models for calculating the fission products release from UO2 and MOX fuel has been demonstrated.
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