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功率跃增辐照装置用于研究堆内进行燃料元件功率跃增试验(PRT)。对置于高通量工程试验堆(HFETR)中的PRT辐照装置,采用MCNP程序计算装置的中子学特性、各结构的释热率及其轴向分布;采用物理-热工耦合计算方法,结合MCNP程序和CFX程序,得到3He回路压力范围内燃料棒的功率变化。结果表明:3He气体层能显著削弱进入氦屏以内结构的热中子流,并降低装置及其周围的中子注量率;改变3He气体密度能显著地改变装置及其周围的中子场,有效地调节试验燃料棒的功率。燃料芯块释热功率随3He气体压力的减小而单调递增,其计算值与采用自然对数函数拟合的曲线吻合良好。
The power jump irradiation device is used to conduct a fuel cell power boost test (PRT) within the research reactor. For the PRT irradiation device placed in high-throughput engineering test reactor (HFETR), the neutron characteristics of the device, the heat release rate of each structure and its axial distribution were calculated by the MCNP program. The physical-thermal coupling calculation method Combining the MCNP program and the CFX program, the power variation of the fuel rods within the 3He circuit pressure range was obtained. The results show that 3He gas layer can significantly weaken the thermal neutron flux entering into the helium screen and reduce the neutron fluence rate of the device and its surroundings. Changing 3He gas density can significantly change the neutron flux of the device and its surroundings, Adjust the power of the test fuel rod effectively. The heat release power of fuel pellets monotonically increases with the decrease of 3He gas pressure, and its calculated value is in good agreement with the curve fitting with natural logarithm function.