METHOD FOR DESIGNING A NUCLEAR FUEL ASSEMBLY WITH DAMPING GUIDE TUBE, CORRESPONDING SYSTEM, COMPUTER PROGRAMME AND SUPPORT

摘要

The invention concerns a method comprising the following steps: determining the falling speed of a control pencil (10) at the entrance of a lower damping section (26) of a guide tube during the fall of the bundle controlling (4) a fuel assembly in case of an emergency shutdown of the nuclear reactor; determining, based on the falling speed determined at step a), the evolution of the falling speed of the control pencil (10) in the lower damping section; determining, based on the evolution of the speed determined at step b), a maximum excess pressure generated in the liquid contained in the lower section (26); and determining, based on the maximum excess pressure determined at step c), a maximum circumferential stress generated in the lower section (26).