The analysis of Molten Salt Reactors

熔盐反应堆(MSR)在稳态或瞬变状态下的分析需要解决独特的多物理挑战，这在任何其他固体燃料反应堆概念中都找不到。挑战涉及热-水力/流体动力学、中子学、库存控制和物种分布之间的耦合。建模的复杂性使得不确定性的量化具有挑战性。MSR核心不断变化的状态产生了整个核心的分布式不确定源。冷却剂-燃料的物理性质与核心中循环的同位素相关的核数据之间的联系并不为人所知。这项工作的目的是开发一种适用于熔盐反应堆设计框架的不确定度量化方法。将把具体重点放在评估反应堆内延迟中子前体运动引起的不确定因素的耦合项上。前人的工作假设了静态条件，忽略了燃料在堆芯中的运动，这会显著改变在MSR中获得的结果。该项目将侧重于为快速频谱MSR概念开发一个敏感性/不确定度分析框架。

The analysis of Molten Salt Reactors (MSRs) during steady or transient states requires addressing unique multi-physics challenges, which are not found in any other reactor concept with solid fuel. The challenges relate to the coupling between thermal-hydraulic/fluid dynamics, neutronics, inventory control and species distribution. The modelling complexity makes uncertainty quantification challenging. The ever-changing state of the MSR core creates a distributed source of uncertainties across the core. The link between the physical properties of the coolant-fuel is strongly coupled with the nuclear data associated with the isotopes circulating in the core are not well-known. The aim of this work is to develop an uncertainty quantification method which is suitable for use in the frame of molten salt reactor design. A specific focus will be put on evaluating the coupled term of uncertainties stemming from the movement of delayed neutrons precursors inside the reactor. Previous works assumed static conditions neglecting the fuel motion through the core, which can significantly alter the results obtained in an MSR. The project will focus on developing a framework for sensitivity/uncertainty analysis for a fast-spectrum MSR concept.