Kinetic effect of scattering neutrons on super-prompt critical system
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摘要: 在点反应堆理论的基础上，建立了研究散射中子影响超瞬发临界系统动态行为的模拟计算方法, 利用CFBR-Ⅱ堆的脉冲实验验证了该方法的正确性。通过分析计算表明, 在超瞬发临界状态, 散射中子的影响包括增加反应性、使脉冲波形后沿展宽和增加脉冲裂变产额。建立的模拟计算方法为预测脉冲堆外各种物体产生的散射中子的动力学效应提供了途径, 对提高脉冲堆的核安全有应用价值。Abstract: A numerical simulation method is built based on the point reactor kinetic equations to study the impact of scattering neutrons on a super-prompt critical system, and its correctness is validated by pulse experiment on CFBR-Ⅱ reactor. The analysis and calculation show that kinetic effects of the scattered neutrons in the super-prompt critical state include that the reactivity increases, the pulse wave is broadened, and the fission yield is enlarged by scattering neutrons. The numerical simulation method can be used to forecast the kinetic effect of scattered neutrons produced by objects out of the pulse reactor, and it is valuable to upgrade the nuclear safety of a pulse reactor.
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Key words:
- neutron dynamics /
- scattering neutron /
- super-prompt criticality /
- pulse reactor /
- nuclear safety
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