Static and Kinetic Experiments on Accelerator-Driven System with 14MeV Neutrons in Kyoto University Critical Assembly
Static and Kinetic Experiments on Accelerator-Driven System with 14MeV Neutrons in Kyoto University Critical Assembly
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DOI：
10.1080/18811248.2008.9711906
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发表时间：
2008-11
影响因子：
1.2
通讯作者：
C. Pyeon;Morgan Hervault;T. Misawa;H. Unesaki;T. Iwasaki;S. Shiroya
中科院分区：
文献类型：
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作者：
C. Pyeon;Morgan Hervault;T. Misawa;H. Unesaki;T. Iwasaki;S. Shiroya
为准备在京都大学临界装置（KUCA）上安装固定场交变梯度（FFAG）加速器，对加速器驱动系统（ADS）进行了静态和动态的实验和数值分析。通过实施中子导向器改进源倍增预计将影响ADS堆芯的特性。利用KUCA堆芯和现有的14 MeV脉冲中子发生器分别测量了铟丝的亚临界度和反应率分布，研究了铟丝对反应性和中子通量分布的影响。通过对MCNP-4C 3的静态测量结果与计算结果的比较，给出了MCNP-4C 3在KUCA 14 MeV中子ADS基础研究中的精度估算，并与JENDL-3.3和ENDF/B-VI.2进行了比较。实验证明，将中子导管延伸到燃料区，可以有效地改善外源。由于实际ADS运行的反应性范围预计在3%Δk/k左右，因此，对于目前的KUCA堆芯，测量和计算的有效性已被证明高达6%Δk/k。瞬发中子衰减常数是用脉冲中子法得到的，次临界是用面积比法得到的，使用的是KUCA研制的光纤探测系统。通过14 MeV中子的ADS动力学实验，光纤探测器被认为是测量次临界和瞬发中子衰变常数的一种有前途的原始工具。
In preparation for connecting a Fixed Field Alternating Gradient (FFAG) accelerator atthe Kyoto University Critical Assembly (KUCA), static and kinetic experimental and numerical analyses of Accelerator-Driven System (ADS) are envisaged. Improvement of source multiplication by the implementation of a neutron guide is expected to affect the characteristics of the ADS core. The effects on reactivity and neutron flux distribution are investigated by measurements of the subcriticality and the reaction rate distributions of indium wire, respectively, using the KUCA core and the current 14MeV pulsed neutron generator. A comparison of the results of static measurements with those of calculations provides an estimation of MCNP-4C3 precision with JENDL-3.3 and ENDF/B-VI.2 for the basic research on ADS with 14 MeV neutrons at KUCA. The neutron guide has proved to be experimentally effective in improving external source when it is extended into the fuel region. Since the reactivity range of the actual ADS operation is expected to be around 3%Δk/k, the validity of both measurements and calculations has been demonstrated up to 6%Δk/k for the current KUCA cores. The prompt neutron decay constant is obtained by the pulsed neutron method, and subcriticality by the area ratio method, using an optical fiber detection system developed at KUCA. The optical fiber detector has been assessed as a promising original tool for the measurements of the subcriticality and prompt neutron decay constant, through ADS kinetic experiments with 14MeV neutrons.