Abstract
A physical model of the radial and axial reflector of VVER-1200-like reactor core has been developed. Five types of radial reflector with different material composition exist for the VVER reactor core and 1D and 2D models were developed for all of them. Axial top and bottom reflectors are described by the 1D model. A two-group XS library for diffusion code DYN3D has been generated for all types of reflectors by using Serpent 2 Monte Carlo code. Power distribution in the reactor core calculated in DYN3D is flattened in the core central region to more extent in the 2D model of the radial reflector than in its 1D model.
Highlights
Deterministic safety analysis of nuclear power plants is performed by using various reactor dynamics codes, such as DYN3D, BIPR, HEMERA, DIF3D, etc
Five types of radial reflector with different material composition exist for the VVER reactor core and 1D and 2D models were developed for all of them
A two-group XS library for diffusion code DYN3D has been generated for all types of reflectors by using Serpent 2 Monte Carlo code
Summary
Deterministic safety analysis of nuclear power plants is performed by using various reactor dynamics codes, such as DYN3D, BIPR, HEMERA, DIF3D, etc. Nodal reactor code DYN3D [1, 2], based on the solution of the transport equation in diffusion approximation is widely used for analysis of stationary and transient processes in the reactor core. A set of homogenized nuclear data (diffusion constants and group cross sections) is needed for each node to simulate neutron-physical processes in the reactor code. This data, called the XS library, can be prepared by using various spectral codes, such as Serpent [3], HELIOS, WIMS, TVS-M, some versions of the MCU and others. A physical model of the reflector of VVER-1200-like reactor core has been developed for XSgeneration library.
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