Preliminary Conceptual Design of Ultra-high Flux Fast Neutron Test Reactor Core
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摘要: 针对先进核能系统发展需要，提出了超高通量堆的堆芯概念设计。本文采用板型燃料、正方形燃料组件设计，设置宽流道保证堆芯冷却剂占有较高的体积份额。堆芯采用52 盒燃料组件，设置8盒控制棒组件和较厚的反射层。通过堆芯概念设计方案评价，结果表明堆芯循环长度可达100EFPD（等效满功率天），所提出的超高通量堆的最大中子注量率可达到1.08×1016 cm−2·s−1。Abstract: To meet the development need of advanced nuclear systems, an ultra-high flux reactor (UFR) core design concept is proposed in this paper. In this concept, plate-type fuel and square fuel assembly design is adopted, and a wide flow channel is provided to ensure a high volume share of the core coolant. The core is provided with 52 boxes of fuel assemblies, 8 boxes of control rod assemblies and a thick reflective layer. The results show that the cycle length of the core can reach 100 equivalent full power days (EFPD) by the core conceptual design scheme evaluation. The maximum neutron fluence rate of the proposed ultra-high flux reactor can reach 1.0×1016 cm−2·s−1.
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图 6 最大点中子注量率随燃耗深度的变化
Figure 6. Variation of Maximum Point Neutron Fluence Rate with the Burnup Level
图 7 活性区平均中子注量率随燃耗深度的变化
Figure 7. Variation of Average Neutron Fluence Rate with the Burnup Level in the Active Zone
图 10 不同径向位置的总中子注量率（相对值）
Figure 10. Total Neutron Fluence Rate (Relative Value) at Different Radial Positions
表 1 堆芯主要设计参数
Table 1. Main Design Parameters of Reactor Core
参数名 参数值 堆芯热功率/MW 200 235U富集度/% 49 燃料组件数目 52 控制棒组件数目 8 径向反射层外径/cm 300 包壳厚度/cm 0.03 芯体厚度/cm 0.09 相邻板间隙/cm 0.28 对边距/cm 8.17 
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