源强对Rossi-α噪声分析的影响

发布时间：2018-05-11 07:37

本文选题：Rossi-α方法 + 中子噪声分析　；参考：《强激光与粒子束》2017年05期

【摘要】：通过数值模拟手段研究了源强对Rossi-α测量的影响。为了定量研究中子源强对Rossi-α测量的影响,基于MCNP软件;开发了用于计算Rossi-α分布的数值模拟工具。反应堆模型和加速器驱动次临界系统的示意模型的数值模拟结果被用于展示瞬发中子衰减常数与源强之间的关联。数值模拟结果表明,入射源强源中子强度对Rossi-α测量结果有显著影响。对于处于次临界状态的反应堆和加速器驱动次临界系统模型,在入射源强较小时,Rossi-α方法可以正确给出反应堆中子衰减常数,但当入射源强较大时,测量不能给出正确的中子衰减常数。通过研究源强和测量结果的关系,可以找到能够给出正确测量结果的最大可用源强。通过选择一个可用源强范围内的较强中子源,可以减少测量所需时间。
[Abstract]:The effect of source strength on Rossi- 伪 measurement was studied by numerical simulation. In order to quantitatively study the influence of neutron source strength on Rossi- 伪 measurement, a numerical simulation tool for calculating Rossi- 伪 distribution is developed based on MCNP software. The numerical simulation results of the schematic model of reactor model and accelerator driven subcritical system are used to show the correlation between the instantaneous neutron attenuation constant and the source strength. The numerical simulation results show that the neutron intensity of the incident source has a significant effect on the Rossi- 伪 measurements. For the model of reactor and accelerator driven subcritical system in the subcritical state, the Rossi- 伪 method can correctly give the neutron attenuation constant of the reactor when the incident source intensity is small, but when the incident source intensity is large, The measurement does not give the correct neutron attenuation constant. By studying the relationship between the source strength and the measured results, the maximum available source strength which can give the correct measurement results can be found. By selecting a strong neutron source in the range of available sources, the measurement time can be reduced.
【作者单位】：中国工程物理研究院战略研究中心;中物院高性能数值模拟软件中心;
【分类号】：O571.5

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