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Evaluation of Neutron Radiography Reactor LEU-Core Start-Up Measurements

机译:中子射线照相反应堆LEU堆芯启动测量的评估

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摘要

Benchmark models were developed to evaluate the cold-critical start-up measurements performed during the fresh core reload of the neutron radiography (NRAD) reactor with low-enriched uranium fuel. Experiments include criticality, control rod worth measurements, shutdown margin, and excess reactivity for four core loadings with 56, 60, 62, and 64 fuel elements. The worths of four graphite reflector block assemblies and an empty dry tube used for experiment irradiations were also measured and evaluated for the 60-fuel-element core configuration. Dominant uncertainties in the experimental k_(eff) come from uncertainties in the manganese content and impurities in the stainless steel fuel cladding as well as the ~(236)U and erbium poison content in the fuel matrix. Calculations with MCNP5 (Monte Carlo N-Particle version 5-1.60) and ENDF/B-Ⅶ.0 neutron nuclear data are ~1.4% (9σ) greater than the benchmark model eigenvalues, which is commonly seen in Monte Carlo simulations of other TRIGA (Training, Research, Isotopes, General Atomics) reactors. Simulations of the worth measurements are within the 2σ uncertainty for most of the benchmark experiment worth values. The complete benchmark evaluation details are available in the 2014 edition of the International Handbook of Evaluated Reactor Physics Benchmark Experiments.
机译:开发了基准模型,以评估在低浓缩铀燃料的中子射线照相(NRAD)反应堆新鲜堆芯重装过程中进行的冷临界启动测量。对于包括56、60、62和64个燃料元件的四个堆芯负载,实验包括关键性,控制杆价值测量,停机裕度和超额反应性。还测量并评估了用于实验辐照的四个石墨反射器模块组件和一个空的干管的价值,并评估了60种燃料元素的芯结构。实验k_(eff)的主要不确定性来自于不锈钢燃料包壳中锰含量和杂质以及燃料基体中〜(236)U和中毒含量的不确定性。使用MCNP5(蒙特卡罗N粒子版本5-1.60)和ENDF /B-Ⅶ.0中子核数据进行的计算要比基准模型特征值大约1.4%(9σ),这在其他TRIGA的蒙特卡罗模拟中很常见(培训,研究,同位素,通用原子)反应堆。对于大多数基准实验价值而言,价值测量的模拟均在2σ不确定性之内。完整的基准评估详细信息可在2014年版的《反应堆物理基准实验国际手册》中获得。

著录项

  • 来源
    《Nuclear science and engineering》 |2014年第4期|550-561|共12页
  • 作者单位

    Idaho National Laboratory P.O. Box 1625, MS 3855, Idaho Falls, Idaho 83415;

    Idaho National Laboratory P.O. Box 1625, MS 3855, Idaho Falls, Idaho 83415;

    Idaho National Laboratory P.O. Box 1625, MS 3855, Idaho Falls, Idaho 83415;

    Idaho National Laboratory P.O. Box 1625, MS 3855, Idaho Falls, Idaho 83415;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:42:57

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