The work aims to develop a dedicated horizontal transport constraint system based on the transportation characteristics and requirements of spent fuel casks to address safety hazards and operational difficulties caused by the heavy weight of casks and the lack of specialized tools and meet the operational requirements for horizontal transportation and integral horizontal lifting of spent fuel casks under different transportation conditions of road, sea, and railway, ensuring the safety of the casks, spent fuel and personnel. The method of Problem Identification-Demand Analysis-Scheme Design-Verification Calculation-Experimental Validation was adopted to firstly conduct a comprehensive review on the series of issues concerning the safety of casks during spent fuel transportation. Secondly, the design requirements of the horizontal transportation constraint system were analyzed, including interfaces, functions, impact load restrictions and service environment conditions. Thirdly, the overall structure design scheme of the constraint system was proposed, and the material of its key components was selected according to the load and service environment requirements. Then, the calculation criteria for strength verification of the constraint system were proposed, and stress calculation was performed for key bearing parts and critical sections. Finally, a prototype of the constraint system was manufactured, subjected to load tests and functional tests, and requirements for regular maintenance were proposed. According to the strength calculation results, the calculated stresses at all key bearing parts and critical sections of the restraint system were less than the allowable stresses, and the load factors were all less than 1. According to the load test and functional test results, the key bearing parts of the constraint system passed the quality inspection after the tests, and the operation process was smooth. Both the theoretical calculation and practical test results of the constraint system meet the design requirements, proving that the design of the constraint system can satisfy the functional and safety requirements for the horizontal transportation and horizontal lifting of the spent fuel cask. This provides a reference method for the design and development of key auxiliary equipment.
Key words
transportation /
constraint system /
spent fuel cask /
safety
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