西安脉冲堆燃料元件精细燃耗分布的蒙特卡罗方法研究

Study on Hyperfine Burnup Distribution Monte Carlo of Fuel in Xi'an Pulsed Reactor

本文采用RMC模拟计算了西安脉冲堆(XAPR)稳态堆芯第1循环燃料元件的精细燃耗分布情况,根据XAPR运行温度制备了多温度点氢化锆的热化截面,计算了零燃耗下XAPR冷态和热态实验的keff。分别考虑燃料棒径向和轴向空间离散化下温度反馈的结果,确定了首循环脉冲堆三维燃耗最深的位置。结果表明,采用燃料棒径向燃耗分区的15EFPD下D5和G14燃料棒燃耗计算结果较径向不分区的结果更接近实验值,RMC应用于XAPR精细燃耗计算具有较高可靠性,可用于脉冲堆物理计算与安全分析工作。

The hyperfine burnup distribution of the fuel in Xi’an Pulsed Reactor(XAPR)of its steady state core arrangement in its first cycle was simulated by RMC.The thermal cross section of zirconium hydride in different temperatures was generated based on the operation temperature of XAPR.The k eff of cold and hot experiments of XAPR with zero burnup was calculated.The highest three-dimensional burnup position of its first cycle was confirmed accounting for radial and axial discretization with temperature feedback effect.The result shows that the calculated axial burnup distribution of D5 and G14 fuel rods with 15 EFPD using radial sub-region method gets closer to the experiment result than that with no radial sub-region.The RMC is reliable in calculation of the hyperfine burnup distribution of the fuel in XAPR and can be used for reactor physics calculation and safety analysis for XAPR.