用逆动力学方法测量研究堆的源项亚临界度

N. Jahan, M. Rahman, M. Q. Huda, S. M. Seo
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引用次数: 1

摘要

在反应堆物理试验中,在临界进近过程中持续监测亚临界状态是很重要的。在核反应堆的运行过程中,反动力学方法的反应性测量被广泛使用。该技术在足够高的功率水平下或在没有外部中子源的堆芯上成功应用,其中点反应堆动力学方程中的中子源项可以忽略。对于低功率水平或亚临界域的运行,中子信号波动的增加可能会导致反应性评估的困难,并且外部中子源直接发射的影响不能被忽视。因此,必须考虑中子源的贡献,这意味着知道一个与源强度成比例的量,它称为源项,然后应该确定它。研究工作是通过最小二乘逆动力学方法(LSIKM)使用专用反应性测量系统测量源项的反应性。在已知源强度和反应性价值的HANARO研究堆模拟器韩国原子能研究所(KAERI)上的应用显示出一致和令人满意的一致性。
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Sub-Criticality Measurement with Source Term for Research Reactor in Inverse Kinetics Method
In reactor physics tests, it is important to monitor sub-criticality continuously during criticality approach. Reactivity measurements by the inverse kinetics method are widely used during the operation of a nuclear reactor. This technique is successfully applied at sufficiently high power level or to a core without an external neutron source where the neutron source term in point reactor kinetics equations may be neglected. For operation at low power levels or in the sub-critical domain, the increase in the fluctuation of the neutron signal may cause difficulties in the evaluation of reactivity and the effect of direct emission from the external neutron source may not be neglected. Therefore, contribution of the neutron source must be taken into account and this implies knowledge of a quantity proportional to the source strength, which calls the source term and then it should be determined. The research work has been conducted to measure reactivity with source term using a dedicated reactivity measurement system by the Least Square Inverse Kinetics Method (LSIKM). Application to a simulator of HANARO research reactor, Korea Atomic Energy Research Institute (KAERI), with known source strength and reactivity worth has showed consistent and satisfactory agreement.
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