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以HI-STORM 100乏燃料干式贮存设施内部装载AFA-3G燃料组件为研究对象,用MCNP(Monte Carlo N Particle Transport Code)4C程序,通过改变贮存设施内外的水密度,采用新燃料假设对不同工况下的临界安全进行研究。结果表明,在正常工况下,keff远低于0.93,是临界安全的。在事故工况下,当水密度大于0.8 g·cm-3时,存在临界安全问题。然后选取适当的核素,通过使用ORIGEN-ARP程序,得到不同燃耗下核素的组成,在同一模型下考虑燃耗信任制,对干式贮存设施的临界安全进行研究。在此基础上,给出了乏燃料干式贮存设施临界安全工作的相关建议。
Taking the AFA-3G fuel assembly loaded in the HI-STORM 100 Spent Fuel Dry Storage Facility as an example, the Monte Carlo N Particle Transport Code (MCNP) 4C program was used to test the water quality by varying the water density inside and outside the storage facility and using the new fuel assumption Under the condition of critical safety research. The results show that under normal conditions, keff far below 0.93, is critical safety. Under accident conditions, when the water density is greater than 0.8 g · cm-3, there is a critical safety issue. Then we choose the appropriate nuclide, and use ORIGEN-ARP program to get the composition of nuclides with different burnups. Under the same model, the criticality safety of dry storage facilities is studied considering the burnup trust system. On this basis, some suggestions on the critical safety of spent fuel dry storage facilities are given.