Integrity Assessment of Spent Fuel Transfer Cask Dropping in Fuel Building
The spent fuel transfer cask may drop from a high altitude during hoisting in the fuel building,causing damage to the containment boundary.Due to the risk of the second drop caused by the penetration through the floor,the cumulative plastic strain and residual kinetic energy in the first drop need to be considered reasonably in the integrity assessment.Therefore,the work aims to conduct a study on the integrity assessment of spent fuel transfer cask dropping in fuel building.With the dropping accident during hoisting in the fuel building of a nuclear power plant as an example,a finite element model was constructed with ANSYS/LS-DYNA by considering the damage to the reinforced concrete of the target floor.The dynamic simulation of the first drop was conducted,and the cumulative plastic strain and residual kinetic energy of the first drop were used as the initial conditions for the second drop.Finally,a shock absorption layer was designed and simulated based on the results of the second drop,and the evaluation was completed.The containment boundary was intact during the first drop,but the floor was penetrated by the drop impact.Due to the large residual kinetic energy during the second drop,the containment boundary only met the integrity requirements after the wood pad was set to reduce vibration on the target floor during the second drop.This study can verify the integrity of spent fuel transfer cask after dropping in the fuel building and provide important reference for relevant safety reviews and dropping accident analysis of similar equipment.
spent fuel transfer caskdropping accidentsintegritysecond dropshock absorption
万方数据
维普
