10 MW多功能池式研究堆控制棒方案设计

Design and Research of Control Rod Scheme for 10 MW Multifunctional Pool-type Research Reactor

  • 摘要: 本文以10 MW多功能池式研究堆为研究对象。针对低功率、少燃料组件数目、反中子阱型的堆芯设计特点,探究了不同形式的控制棒及其布置对棒自身价值和堆芯的影响,在兼顾反应堆运行安全、孔道中子注量率、功率峰因子和后续燃料管理方式等方面下,最终确定采用叉形控制棒形式,通过研究叉形控制棒内中子注量率和线功率密度等参数分析其使用安全。结果表明:采用叉形控制棒的堆芯方案,最大满功率运行天数较低,燃料组件功率分布平坦,总功率峰因子<1.5,相较其他方案,在全寿期内,堆内孔道平均热中子注量率更高;从控制棒安全性能考虑,叉形控制棒的内侧控制板最大温度也远低于其温度限值。本文结果可为10 MW多功能池式研究堆控制棒设计方案提供参考。

     

    Abstract: Swimming pool-type reactors have typical advantages such as simple system, high inherent safety, powerful irradiation application function, moderate core size, diverse irradiation channels, and simple operation and maintenance. Among them, Class Ⅱ research reactors have low operating costs and can carry out various low-temperature irradiation tests. Their performance indicators are sufficient to meet the needs of fuel and material testing, production of various medical isotopes, and large-size single crystal silicon doping. They are an indispensable part of my country’s research reactors to achieve high, medium and low power matching. In order to meet the future needs of new reactor fuels, material tests and various neutron applications in my country, an overall design scheme for a new 10 MW multifunctional pool-type research reactor was proposed. At the same time, application facilities such as boron neutron capture therapy (BNCT), large-size single crystal silicon neutron transmutation doping (NTD) channels, horizontal channels and hot columns were set up in the reactor pool area to realize multifunctional neutron application capabilities. Aiming at the core design characteristics of low power, small number of fuel assemblies and anti-neutron well type, the influence of three different forms of control rods and their arrangements on the value of the rods themselves and the core was explored. Taking into account the safety of reactor operation, channel neutron fluence rate, power peak factor and subsequent fuel management methods, the forked control rod form was finally determined. The neutron fluence rate and linear power density in the forked control rod were analyzed to ensure its safety in use. The results show that for each core scheme using forked control rods, the maximum full-power operation days are lower, but the power distribution of the fuel assembly is flat, and the total power peak factor is <1.5. Compared with other schemes, the average thermal neutron fluence rate in the core channels is higher throughout the life cycle. Considering the safety performance of the control rods, the maximum temperature of the inner control plate is also far below its temperature limit. By comparing three types of control rods, this paper reveals the typical characteristics of three mature control rod schemes suitable for compact cores and plate-shaped fuel assemblies, and proposes a design scheme for a control system for a 10 MW multifunctional pool-type research reactor using forked control rods, which makes the reactor power peak factor lower and the channel neutron fluence rate higher, ensuring stable and safe operation of the core and ensuring that the research reactor has efficient irradiation capability.

     

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