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First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

Nuclear Science and Techniques 2021年第2期32卷 11-23页

作者： Wen-Cong Wang Li-Yuan Huang Cai-Xue Liu Han Feng Jiang Niu Qi-Dong Dai Guo-En Fu Lin-Feng Yang Ming-Chang Wu Nuclear Power Institute of China Chengdu 610041China

Abstract Reactivity measurement is an essential part of a zero-power physics test,which is critical to reactor design and *** rod drop experimental technique is used to measure the control rod worth in a zero-power physics *** conventional rod drop experimental technique is limited by the spatial effect and the difference between the calculated static reactivity and measured dynamic reactivity;thus,the method must be *** this study,a modified rod drop experimental technique that constrains the detector neutron flux shape function based on three-dimensional space–time dynamics to reduce the reactivity perturbation and a new method for calculating the detector neutron flux shape function are *** factors were determined using Monte Carlo N-particle transport code and transient analysis code for a pressurized water reactor at the Ulsan National Institute of Science and Technology and Xi’an Jiaotong University,and a large reactivity of over 2000 pcm was measured using the modified *** research evaluated the modified technique accuracy,studied the influence of the correction factors on the modification,and investigated the effect of constraining the shape function on the reactivity perturbation reduction caused by the difference between the calculated neutron flux and true value,using the new method to calculate the shape function of the detector neutron flux and avoiding the neutron detector response function(weighting factor)calculation.

关键词： Large reactivity measurement Rod drop technique Space-time dynamics constrained shape function Monte Carlo N-particle

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