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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Interpretation of the TRADE In-Pile source multiplication experiments
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Interpretation of the TRADE In-Pile source multiplication experiments

机译：解释TRADE桩内源乘法实验

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Within the framework of the neutronic characterization of the TRIGA RC-1 reactor in support to the TRADE (TRiga Accelerator Driven Experiment) program, the interpretation of the subcriticality level measurements performed in static regime during the TRADE In-Pile experimental program is presented. Different levels of subcriticality have been measured using the MSA (Modified Source Approximated) method by the insertion of a standard fixed radioactive source into different core positions. Starting from a reference configuration, fuel elements were removed: control rods were moved outward as required for the coupling experiments envisioned with the proton accelerator and fission chambers were inserted in order to measure subcritical count rates. A neutron-physics analysis based on the modified formulation of the source multiplication method (MSM) has been carried out, which requires the systematic solution for each experimental configuration of the homogeneous, both in the forward and adjoint forms, and inhomogeneous Boltzmann equations. By means of such a methodology calculated correction factors to be applied to the MSA measured reactivities were produced in order to take into account spatial and energetic effects creating changes in the detector efficiencies and effective source with respect to the calibration configuration. The methodology presented has been tested against a large number of experimental states. The measurements have underlined the sensitivity of the MSA measured reactivities to core geometry changes and control rod perturbations; the efficiency of MSM factors to dramatically correct for this sensitivity is underlined, making of this technique a relevant methodology in view of the incoming US RACE program to be performed in TRIGA reactors. (c) 2006 Elsevier B.V. All rights reserved.
机译：在支持TRADE（TRiga加速器驱动的实验）程序的TRIGA RC-1反应堆的中子表征的框架内，介绍了在TRADE堆内实验程序中在静态状态下执行的亚临界水平测量的解释。通过将标准的固定放射源插入不同的堆芯位置，已使用MSA（近似修正源）方法测量了不同程度的亚临界。从参考配置开始，删除了燃料元件：根据质子加速器设想的耦合实验的要求，向外移动控制杆，并插入裂变室以测量次临界计数率。已经进行了基于源乘方法（MSM）修改公式的中子物理分析，这要求对均质的每个实验配置（正向和伴随形式）以及不均匀的玻尔兹曼方程进行系统求解。通过这种方法，计算出的校正因子将被应用于MSA测得的反应性，以便考虑空间和能量效应，从而导致检测器效率和有效源相对于校准配置发生变化。所提供的方法已针对大量实验状态进行了测试。这些测量结果强调了MSA测量的反应性对岩心几何形状变化和控制杆扰动的敏感性；着重强调了MSM因素可以显着校正这种敏感性的效率，鉴于即将在TRIGA反应堆中执行的US RACE程序，使该技术成为一种相关方法。 （c）2006 Elsevier B.V.保留所有权利。

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