Conceptual Design and Physical Analysis of Multi-Purpose Heat Pipe Reactor Prototype
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摘要: 为了验证多用途小型热管反应堆核动力技术的可行性,设计了一个多用途热管堆核电源系统一体化集成实验装置。该实验装置利用高温钾热管实现堆芯冷却及能量传输过程,利用斯特林热机及方钴矿热电片实现动态及静态热电转换过程,本文通过蒙特卡洛程序MCNP完成样机堆芯物理设计,为热管堆原型样机落成提供技术支持。验证结果表明:选用富集度为80%的UN燃料可以满足设计需求;堆芯中子呈快中子谱分布;当2个以上的B4C毒物朝向堆内,反应堆即可实现安全停堆;堆芯功率峰因子为1.37。该研究可为热管堆原型样机带核试验提供参考依据。Abstract: To verify the feasibility of the multipurpose micro heat pipe reactor nuclear power technology, an integrated experimental device for multipurpose heat pipe reactor power system was designed. This experimental device utilizes high-temperature potassium heat pipes to achieve core cooling and energy transfer processes, employs Stirling engines and bismuth cobaltite thermoelectric modules to realize dynamic and static thermoelectric conversion processes. In this paper, the prototype core physical design of the reactor was carried out using the Monte Carlo code MCNP, which provides technical support for the completion of the heat pipe reactor prototype. The validation results indicate that 80% enriched UN fuel can meet the design requirements; the core neutron spectrum exhibits a fast neutron distribution; when more than two B4C poisons are oriented toward the core, the reactor can be safely shut down; and the core power peaking factor is 1.37. This research can serve as a reference for the critical experiments of the heat pipe reactor prototype.
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Key words:
- Heat pipe reactor /
- Prototype /
- Conceptual design /
- Core physical analysis
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表 1 钾热管参数
Table 1. Parameters of Potassium Heat Pipes
参数名 参数值 管壳尺寸/mm Φ20×2×1400 吸液芯目数 600 吸液芯厚度/mm 2 蒸发段长度/mm 300 绝热段长度/mm/ 940 冷凝段长度/mm 160 表 2 样机参数
Table 2. Parameters of Prototype
参数名 参数值 热功率/kW 40 动态斯特林发电功率/kW 3 电功率/kW 4.5 静态热电片发电功率/kW 1.5 表 3 样机堆芯设计参数表
Table 3. Reactor Core Design Parameters of Prototype
参数名 参数值 热功率/kW 40 堆芯直径/cm 50.6 活性区高度/cm 38 基体外接圆直径/cm 28.9 反射层厚度/cm 7.3~12.8 转鼓数量 6 燃料棒间距/mm 21.3 燃料棒直径/mm 17.3 热管直径/mm 20 表 4 不同角度的情况下堆芯的keff
Table 4. keff of Core under Different θ
θ 0° 45° 90° keff 0.93272 0.95196 0.99087 误差 0.00023 0.00025 0.00024 反应性 −0.07213 −0.05046 −0.00921 θ 135° 180° keff 1.01957 1.02743 误差 0.00025 0.00026 反应性 0.01919 0.02670 表 5 转鼓卡轴事故工况下堆芯keff与反应性
Table 5. keff and Reactivity under Control Drum Stuck Accident
向外转鼓编号 keff 反应性 1 0.94825 −0.05457 1、2 0.96502 −0.03625 1、3 0.96274 −0.0387 1、4 0.96320 −0.03821 1、2、3 0.98101 −0.01936 1、2、4 0.97874 −0.02172 1、3、5 0.97745 −0.02307 1、2、3、4 0.99640 −0.00361 1、2、3、5 0.99460 −0.00543 1、2、4、5 0.99458 −0.00545 2、3、4、5、6 1.01106 0.010939 1、2、3、4、5、6 1.02743 0.026698 -
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