Study on non-uniform control rod with BeO reflectors

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2025-05-27 DOI:10.1016/j.anucene.2025.111589

Feilong Liu , Xiaoqin Nie , Du Liu , Xiaoan Li , Cheng Liu , Zhengguo Chen

引用次数: 0

Abstract

When the non-uniform control rods are used in power control system of Pressurized Water Reactor(PWR), its outer neutron absorbers will absorb neutrons throughout its life, which will reduce the fuel burnup level. To reduce this influence, outer absorbers of non-uniform control rod are replaced by the BeO reflectors. Without considering the external reflectors and the arrangement of combustible poison rods, The N = 2 type AB non-uniform control rod system of Qinshan nuclear power plant in China is established by MCNP5. And then the core axial neutron flux densities are calculated when non-uniform control rod is at five thickness BeO reflectors. The simulation results show that the non-uniform control rod with BeO reflectors can not only keep control functions of axial power deviation and power level control as without reflector, but also increase the core neutron flux density by increasing the thickness of the BeO reflectors.

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带有BeO反射器的非均匀控制棒的研究

非均匀控制棒在压水堆动力控制系统中使用时，其外部中子吸收器会在整个使用寿命期间吸收中子，从而降低燃料燃耗水平。为了减少这种影响，将非均匀控制棒的外部吸收器替换为BeO反射器。中国秦山核电站的N = 2型AB型非均匀控制棒系统在不考虑外反射器和可燃毒棒布置的情况下，由MCNP5建立。然后计算了非均匀控制棒在五层BeO反射器处的堆芯轴向中子通量密度。仿真结果表明，带BeO反射镜的非均匀控制棒既能保持不带BeO反射镜的轴向功率偏差控制和功率电平控制功能，又能通过增加BeO反射镜的厚度来提高堆芯中子通量密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.