Three-dimensional Monte Carlo transport code JMCT in shielding engineering application
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摘要: 核设施辐射屏蔽计算，由于其大规模计算及深穿透等特性，一直是蒙特卡罗方法工程应用的难点之一。采用我国自主研发的三维中子-光子蒙特卡罗粒子输运模拟软件JMCT，结合可视化建模工具JLAMT，对OECD国际基准例题Winfrith Iron/Water Benchmark Experiment(ASPIS)两例实验装置进行建模与计算分析, 并将计算结果与实验值及MCNP计算值进行对比。结果表明，JMCT计算值与MCNP计算值符合较好，其中Winfrith Iron Benchmark Experiment(ASPIS)最大偏差不超过7%，平均偏差1.3%；Winfrith Water Benchmark Experiment(ASPIS)最大偏差小于20%，平均偏差小于10%，证明了JMCT在屏蔽计算以及深穿透问题的可靠性与工程应用性。Abstract: Radiation shielding calculation of nuclear facilities has always been one of the difficulties in engineering application of Monte Carlo method for its large scale calculation and deep penetration characteristics. Two international benchmarks, published by OECD, Winfrith Iron/Water Benchmark Experiment(ASPIS), were simulated based on the three-dimensional Monte Carlo transport code JMCT, accompanied by a visual modeling tool JLAMT. The simulation includes detailed modeling and shielding calculation. Calculated results were compared with experimental data, also with almost same results achieved by MCNP. The comparisons show that the calculated results agree well with the experimental data. The maximum deviation of JMCT and MCNP is below 20% and the average deviation is less than 10%. It is proved that JMCT code suits well for shielding simulation and deep penetration problems.
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Key words:
- Monte Carlo /
- deep penetration /
- JMCT /
- JLAMT /
- shielding transportation
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图 2 Winfrith Iron Benchmark(ASPIS)实验装置整体布置
Figure 2. Layout of Winfrith Iron Benchmark(ASPIS)
图 3 Winfrith Iron Benchmark模型JMCT建模图
Figure 3. Sectional view of Winfrith Iron Benchmark model
图 4 Winfrith Water Benchmark(ASPIS)实验装置整体布置
Figure 4. Layout of Winfrith Water Benchmark(ASPIS)
图 5 Winfrith Water Benchmark模型JMCT建模图
Figure 5. Sectional view of Winfrith Water Benchmark model
图 6 Winfrith Iron Benchmark不同穿透距离下的中子通量能谱
Figure 6. Neutron flux energy spectra for Winfrith Iron Benchmark
图 7 JMCT和MCNP计算的Rh和Au探测器在屏蔽体内不同深度下的反应率
Figure 7. Reaction rate of Rh and Au detector in different depth calculated by JMCT and MCNP
图 8 Winfrith Water Benchmark不同源项配置方案下的中子通量能谱
Figure 8. Neutron flux energy spectra of different source-detector spacing for Winfrith Water Benchmark
图 9 Winfrith Water Benchmark不同源项配置方案下S探测器的反应率
Figure 9. S detectors' reaction rate of different source-detector spacing R for Winfrith Water Benchmark
表 1 Winfrith Water Benchmark实验不同源项配置方案及相应模拟粒子数规模
Table 1. Experimental source arrangements and scale of simulated particles in different cases for Winfrith Water Benchmark
case source-detector spacing/cm number of sources total source strength/(n·s-1) particles 1 10.16 1 1.256 0×107 4×107 2 15.24 2 2.540 0×107 2×108 3 20.32 4 5.260 0×107 2×108 4 25.40 8 1.048 0×108 2×108 5 30.48 8 1.046 0×108 1×109 6 35.56 8 1.048 0×107 1×109 7 50.80 8 1.044 5×108 1×109 
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