Testing of transport layouts packaging kits for spent effects of nuclear fuel on external impacts

A test procedure for models of transport packaging sets (TPSs) for spent nuclear fuel for external shock effects (falling on a pin, falling on dampers, impact of a falling aircraft) is presented, taking into account large-scale effects and the presence of technological defects in the TPS body. The main idea of the technique is that artificial crack-like defects are created in the body of the model in the area of maximum tensile stresses. Their dimensions are determined by the technological defects of forgings, castings, welds, the scale of the layouts, and the dispersion of the fracture toughness characteristics of the body material. The conservativeness of the simulation test results is ensured by the fact that the probability of destruction of a mock-up with artificial defects exceeds the probability of destruction of a full-scale TPS. The results of calculations of the stress-strain state and strength of mock-ups of transport packaging sets (TPSs) for the BREST-OD-300 during throwing tests and impact tests of a falling aircraft are presented. Using the concept of a master curve, the probabilities of destruction of full-scale TPS and reduced layouts were estimated depending on the test temperature. It is shown that the steel 09N2MFBA-A used for the manufacture of TPS housings has high dynamic fracture toughness, ensuring the integrity of the TPS at temperatures lowered to –60°C.