基于熔盐堆尾气提取的99Mo生产评估  

Evaluation of 99Mo production based on molten salt reactor off-gas extraction

作　　者：陈亮[1,2] 朱贵凤 王子业[1,3] 严睿 邹杨 徐洪杰[1,2,3] CHEN Liang;ZHU Guifeng;WANG Ziye;YAN Rui;ZOU Yang;XU Hongjie(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《核技术》2024年第8期129-137,共9页Nuclear Techniques

基　　金：中国科学院战略性先导科技资助项目(No.XDA02010000)、中国科学院青促会(No.2020261)资助;上海市自然科学基金面上项目(No.19ZR1468000);国家自然科学基金(No.12005290)~~。

摘　　要：基于熔盐堆尾气提取99Mo同位素的生产方法引起了广泛的关注,但目前的工作局限于评估堆芯中99Mo的产量,对于其在整个回路中的迁移行为的关注不足。本文建立了一个熔盐堆中的贵金属迁移模型,并基于8 MW熔盐实验堆(Molten-Salt Reactor Experiment,MSRE)进行了贵金属分布验证,而后对MSRE尾气中99Mo粗产品的产量、比活度及运行状态的变化对生产的稳定性的影响进行了分析。结果表明,尾气中的99Mo有较高含量和比活度,移除率增加的工况对99Mo的比活度的影响是有益的,空泡比例及氧化还原电势变化的工况对99Mo的比活度影响不大,该方法可作为一种潜在的99Mo生产备选方案。[Background]The extraction of 99Mo medical isotopes from off-gas of molten salt reactors(MSRs)has attracted significant attention.However,previous studies focused only on the estimation of 99Mo nuclide production in the reactor core,and limited studies have focused on the expansion of the entire reactor system.[Purpose]This study aims to estimate 99Mo production in the off-gas of a molten salt reactor.[Methods]In this study,a 99Mo migration model with noble metal deposition and a flow effect in an MSR was established by using scientific computing software“Mathematica”,and a corresponding verification based on the deposition result of a molten salt reactor experiment(MSRE)was implemented.Subsequently,an analysis was conducted on the impact of changes in the yield,specific activity,and operational status of 99Mo crude product in MSRE off-gas on the stability of production.[Results]The analysis results of Mo transport in the MSRE show that the production of 99Mo in the offgas can reach 69.30 TBq with a specific activity of 0.39 PBq∙g-1 under normal operating conditions.In addition,an increase in the removal rate is conducive to the effect on the specific activity of 99Mo whilst the working conditions of bubble surface ratio bubble ratio and oxidation-reduction potential changes have little effect on the specific activity of the product.[Conclusions]The 99Mo in off-gas has high yield and specific activity,and the effects of the conventional operating conditions on the specific activity of 99Mo are beneficial,which indicates that this method can be a potential alternative for 99Mo production.

关 键 词：熔盐堆 医用同位素 99Mo MSRE 核素迁移 

分 类 号：TL92[核科学技术—核燃料循环与材料]