SINARA SOFTWARE PACKAGE FOR COMPUTER SIMULATION OF EMERGENCY PROCESS DYNAMICS IN FAST NEUTRON REACTORS

V. V. Gadzhieva, N. V. Gorin, A. V. Kim, S. Yu. Kuzmin, S. N. Lebedev, T. V. Lebedeva, G.V. Orlov, V. N. Pisarev, N. V. Ptitsyna, E.M. Romanova, V. V. Rykovanova, O. V. Stryakhnina, E. A. Sozinov, A. A. Shestakov, V. M. Shmakov
VANT. Ser.: Mat. Mod. Fiz. Proc 2000. Вып.3. С. 25-35.

The paper describes the software package SINARA for calculating some emergency processes in a fast reactor. The movement of multicomponent one-speed medium is simulated. Account is taken of elastic and strength properties of materials, linear heat conduction, neutron transport in kinetic and diffusion approximations, nuclei kinetics, energy release, delayed neutrons. The medium model gives consideration for elasticity, plasticity, compressibility, destruction, fusion, evaporation and multicomponent nature. The finite-difference methods for calculating gas dynamics movement and thermal processes are based on implicit ROMB technique, those for calculating kinetic processes - on diamond model of DS_n-method. The calculations of core emergency energy release effect on reactor vessel were carried out. The potentialities of the developed model for heterogeneous failing medium were tested. An estimation was made of the model suitability for computing accidents inside a reactor vessel. Multistage systems of neutron nuclear constants specially developed for computing dynamic processes in reactors with a liquid metal coolant were used. Base tools for arranging parallel computations in local area networks on various types of computers under OS Unix were created. A geometrical decomposition method with the introduction of internal boundary conditions was applied for parallelizing calculations.