Abstract ITER Isotope Separation System (ISS) is based on cryogenic distillation process and is one of the main systems within the ITER Fuel Cycle. Similar to ITER ISS, one of the key systems of a detritiation plant for low level tritiated light or heavy water is the cryogenic distillation. Provisions are being made in ICSI to design and build an experimental facility based on CECE (Combined Electrolytic Catalytic Exchange) process coupled to a cryogenic distillation system able to process these kinds of waters. The aim of this work is to present the results of the design and simulation activities in support to the development of a cryogenic distillation system capable to achieve the required decontamination factor and tritium enrichment better than 90 %. This is done by using a software developed “in house”, based on heat and mass transfer model. Based on the input data like, flow rates, composition of the feeding gas, pressure drop, the simulation provides the distribution of all the molecular species involved, temperature profile and also the liquid and vapor enthalpies along the column. The results may provide useful information for the ITER ISS decontamination factor during dynamic operation due to the ISS transient feed flow rate coming from the WDS (Water Detritiation System).

中文翻译：

---

ICSI中试装置低温精馏分离氢同位素专用软件开发

摘要 ITER同位素分离系统（ISS）基于低温蒸馏工艺，是ITER燃料循环中的主要系统之一。与 ITER ISS 类似，用于低水平氚化轻水或重水的脱氚设备的关键系统之一是低温蒸馏。ICSI 正在准备设计和建造一个基于 CECE（联合电解催化交换）工艺的实验设施，该工艺与能够处理这些类型水的低温蒸馏系统相结合。这项工作的目的是展示设计和模拟活动的结果，以支持开发能够实现所需的净化因子和超过 90% 的氚富集的低温蒸馏系统。这是通过使用“内部”开发的基于传热和传质模型的软件来完成的。基于输入数据，如流速、进料气体的组成、压降，模拟提供了所有涉及的分子种类的分布、温度分布以及沿柱的液体和蒸汽焓。由于来自 WDS（水净化系统）的 ISS 瞬态进料流速，该结果可为动态运行期间 ITER ISS 净化因子提供有用信息。