Megawatt-class heat pipe reactors (HPRs) have been identified as a candidate for the decentralized electricity markets, for instance, remote regions, island communities, and military bases. HPRs exhibit some unique designs, such as the encapsulated solid core with fuel pellets and heat pipes, control drums, and irregular reflectors. The neutronic tools are under development to investigate core characteristics and serve multiphysics coupling. This paper proposes a public neutronic benchmark of megawatt HPR of which all modeling parameters are available. This paper uses open-source Monte-Carlo code OpenMC to carry out the preliminary neutronic analysis of this benchmark. The influence of the cross-section library can be >750 pcm. The addition of axial structures zone can lead to >300 pcm reactivity increase. The Doppler effect of fuel exactly matches the oxide-fueled fast reactor Doppler constant formula. The reactivity worth of the control devices, flux distribution, power distribution, and depletion results are presented and accessible for future benchmarks.

兆瓦级热管反应堆（HPR）已被确定为分散电力市场（例如，偏远地区，岛屿社区和军事基地）的候选者。HPR具有一些独特的设计，例如带有燃料芯块和热管的密封实心芯，控制鼓和不规则反射镜。正在开发中子学工具以研究核心特征并为多物理场耦合服务。本文提出了兆瓦级HPR的公共中子基准，其所有建模参数均可用。本文使用开源蒙特卡罗代码OpenMC对该基准进行了初步的中子分析。截面库的影响可以大于750 pcm。轴向结构区的添加可导致> 300 pcm的反应性增加。燃料的多普勒效应与氧化物燃料快堆多普勒常数公式完全匹配。提出了控制设备的反应性，通量分布，功率分布和损耗结果，并可供以后的基准测试使用。