In recent years a resurgence of interest in flowing fuel Molten Chloride salt Fast Reactors (MCFRs) has been observed. However, no such reactors have been constructed. There are few core designs available in the open literature, and typical nuclear safety assessment tools are felt to be inadequate for MCFR concepts. Upon reviewing MCFR designs several issues are revealed. For instance, there is a lack of consistent thermophysical properties utilized in proposed core designs. Spherical cores are typically considered, which opens up the possibility of recirculation zones containing fuel salt. There has been minimal consideration for core component lifetimes and how to keep the reflector cool during operation. As part of an effort to consider transients in a MCFR, a preliminary reactor design is developed. In this newly developed design, the core has constrained inlet and outlet flow paths and a replaceable reflector. The design is developed using the fast reactor codes DIF3D, PERSENT, GAMSOR, and MC²-3. Additionally, a heat exchanger sizing study is conducted for this system. The design developed reveals significant engineering challenges such as a large core and heat exchanger volume, inner reflector lifetimes on the order of five years, a lack of verified thermophysical properties, and an operational temperature range above that of any nuclear qualified materials.

近年来，人们对流动的燃料熔融盐快速反应器（MCFR）的兴趣重新兴起。但是，尚未建造这样的反应器。开放文献中几乎没有可用的核心设计，并且典型的核安全评估工具被认为不足以用于MCFR概念。在审查了MCFR设计后，发现了一些问题。例如，在提出的芯设计中缺乏一致的热物理性质。通常考虑使用球核，这可能会增加包含燃油盐的回流区域的可能性。对于核心组件的寿命以及如何在操作过程中保持反射器凉爽的考虑很少。作为考虑MCFR中瞬态的工作的一部分，开发了初步的反应堆设计。在这个新开发的设计中，纤芯的入口和出口流动路径受限，并且可更换反射器。该设计是使用快速反应堆代码DIF3D，PERSENT，GAMSOR和MC开发的² -3。另外，对该系统进行了换热器尺寸研究。所开发的设计显示出重大的工程挑战，例如较大的芯和热交换器体积，内部反射器寿命（大约五年），缺乏经过验证的热物理特性以及工作温度范围高于任何核合格材料。