A SYSTEM APPROACH FOR STRENGTH PROBLEM SOLUTION OF THE BN-800 REACTOR PLANT ELEVATOR FOR AN EMERGENCY CASE OF CARRIAGE RUNNING-OFF
The paper considers numerical analysis of dynamic deformation of the elevator of the in-reactor fuel assembly handling mechanism of BN-type reactors in the case of abnormal running-off of a carriage with a fuel assembly along a guide and impact interaction of this carriage with a barrier. The urgent character of the paper is determined by such type occurred events. Numerical analysis was preceded by experimental and theoretical studies of deformation and rapture processes of 10Cr18Ni9 steel, which is the material used for manufacture of elevator elements. The processes were studied in a wide range of variations of deformation rates and temperatures. The obtained experimental data were used to build a mathematical model of material behavior. The mathematical model was verified by a number of experiments. Design analysis was made using the LS-DYNA dynamic analysis module of the certified ANSYS program complex. The LS-DYNA module is intended for design analysis of high-non-linear dynamic processes by means of the explicit scheme of integration of dynamic equations. The results of numerical simulation confirm fulfillment of strength conditions elevator elements and integrity of fuel assembly being in it.