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首页> 外文期刊>Annals of nuclear energy >An assessment of prompt neutron reproduction time in a reflector dominated fast critical system: ELECTRA
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An assessment of prompt neutron reproduction time in a reflector dominated fast critical system: ELECTRA

机译:在反射器主导的快速临界系统中评估中子迅速再生的时间:ELECTRA

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摘要

In this paper, an accurate method to evaluate the prompt neutron reproduction time for a reflector dominated fast critical reactor, ELECTRA, is discussed. To adequately handle the problem, explicit time dependent Monte Carlo calculations with MCNP, applying repeated time cut-off technique, are used and compared against the σ~1/v time dependent absorber method, applying artificial cross-section data in the Monte Carlo code SERPENT. The results show that when a reflector plays a major role in criticality for fast neutron reactor, the two methods predict different physical parameters (Λ = 69 ± 2 ns and Λ = 83 ± 1 ns for time cut-off and the 1/v method respectively). The reason is explained by applying Avery-Cohn's two-region prompt neutron model.
机译:本文讨论了一种以反射器为主的快速临界反应堆ELECTRA评估中子迅速再生时间的准确方法。为了适当地解决该问题,使用了采用重复时间截止技术的显式时间相关的蒙特卡罗计算,并采用了重复的时间截止技术,并将其与σ〜1 / v时间相关的吸收器方法进行了比较,并在蒙特卡洛代码中应用了人工截面数据蛇。结果表明,当反射器在快中子反应堆的临界状态中起主要作用时,两种方法可预测不同的物理参数(对于时间截止,Λ= 69±2 ns和Λ= 83±1 ns; 1 / v方法分别)。通过应用艾利-科恩(Avery-Cohn)的两区域快速中子模型来解释其原因。

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