ESTIMATION OF THE CONSEQUENCE OF THE ITPS FALLS DURING TRANSPORTATION AND PROCESSING (HANDLING) OPERATIONS

Abstract

The main results are presented for the analysis of the process of falling of the in-object transportation packaging set (ITPS) in case of fracture of the fixing or slinging elements and estimation of the consequences of ITPS falling during transportation and processing (handling) operations. The ITPS is permitted to transfer to the limiting condition in the result of falling, when its further operation is not acceptable, and recovery of its functional condition is not expedient, excluding the possibility of falling out of the nuclear fuel (NF) or distortion of the relative position of the NF in the ITPS. To reduce the costs at the design stage the following representative calculation research of the ITPS was carried out for dynamic impacts to identify weak points of the design in case of an emergency situation. The computational analysis of falling was carried out using the module for dynamic analysis LS DYNA of ANSYS software, certified by the Rostekhnadzor authorities. LS-DYNA module is designed for computational analysis of highly nonlinear dynamic processes using an explicit integration scheme for dynamic equations.The completed full-scale mathematical 3D modeling permitted to carry out sufficiently deep and detailed analysis of dynamic processes, reducing the design duration, and it permitted to reduce the self-cost of the developed design. The results obtained for different variant of the ITPS falling permitted to analyze the collision process, to determine the values of the plastic deformation appearing in the ITPS elements and to provide recommendations for its modification.