Jméno :Bc. Radek Bulín
Název :BASIC ANALYSIS OF A CONTROL ASSEMBLY DROP IN NUCLEAR REACTORS
Autoři :BULÍN R., HAJŽMAN M., POLACH P.
Abstrakt :Main types of widely used pressurized water-cooled and water-moderated nuclear reactors (VVER type) in nuclear power plants have to be controlled by special control assemblies. These control assemblies have a different structure with various design elements, but they are commonly based on a certain engine driving a control rod composed of absorbers and fuel rods. The control rods move through some guide and safety structures in
pressurized water. The goal of numerical simulations is modelling of standard processes of operation and the modelling of emergency states when the control assembly has to drop down to the lower position and it should cause the stop of a chain nuclear reaction in a core. This paper is focused on the modelling and dynamic analysis of the nonlinear system representing the control assembly of the real VVER 440/V213 nuclear reactor
which is used in many countries. A simple rigid body model intended for basic dynamic analyses is introduced. It contains the influences of the pressurized water and mainly the effects of possible control assembly contacts with guiding tubes inside the reactor. The illustrative results obtained using a complex multibody model are shown and the suitability of both modelling approaches is discussed.