Bednyakov S.M., Bezborodov А.А., Izotov V.V., Мikhailov G.М., Prishchepa V.V., Semenov M.Yu.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
At BFS stands the procedure for loading fuel into the core during fast reactor start-up was tested to justify its nuclear safety. The BFS stands are designed to study the neutron-physical characteristics of critical assemblies, including models of fast-neutron reactors. At the critical assembly by means the BFS standard simulation tools may be assembled the fast reactor configuration with a minimum critical mass and measured the effectiveness of its control and protection systems by two different methods (“run-away – rod-drop method” and approached source multiplication method) in order to increase the reliability of measurements. Next, a set of critical mass with a fast reactor start-up core is simulated. Control and protection system (CPS) rods worth was also simulated using two different methods. The evaluation of changes in the efficiency of the fast reactor control and protection systems during the transition from the minimum critical mass to the start-up core took into account. Control and protection system (CPS) rods worth must comply with the modern nuclear safety standards and regulations requirements for the fast reactor project throughout the entire period of its operation. What is possible to prove experimentally during the fast reactor physical start-up simulation procedure at the BFS stands.
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