Effective capture of gaseous Se during spent nuclear fuel recycling using calcium oxide pellets: Optimization, performance, and practical implications

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology Pub Date : 2024-08-13 DOI:10.1016/j.net.2024.08.021

Seok-Min Hong, Chang Hwa Lee, Jae-Hwan Yang, Namcheol Kim

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引用次数: 0

Abstract

The continuous utilization of nuclear energy has led to the accumulation of spent nuclear fuel (SNF) containing uranium, transuranium, and fission products (FPs). Reprocessing and pyrochemical methods have shown the potential for SNF reuse, thereby reducing its environmental impact. Voloxidation, a pivotal step in SNF recycling, involves thermal treatment in an oxidizing atmosphere to enhance the reactivity. During voloxidation, Se-79, which is a FP with a long half-life, is released as SeO under oxidizing conditions, necessitating technologies to capture it. CaO pellets (CPs) were prepared to capture gaseous SeO. The effects of operating conditions on SeO capture performance were investigated. The CP reacts strongly with SeO to form CaSeO, exhibiting a high adsorption capacity of 17.5 mol kg and >99 % efficiency at 700 °C. The mechanical strength and thermal stability assessments indicate suitability for practical applications. Depending on the flow rate, the CP required for SeO capture was estimated when processing 1 t of SNF, thereby contributing to the design of effective SeO capture systems for safe and sustainable nuclear waste management.

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利用氧化钙颗粒在乏核燃料再循环过程中有效捕获气态硒：优化、性能和实际意义

核能的持续利用导致了含有铀、超铀和裂变产物（FPs）的乏核燃料（SNF）的积累。后处理和热化学方法显示了乏核燃料再利用的潜力，从而减少了其对环境的影响。氧化是 SNF 循环利用的关键步骤，包括在氧化气氛中进行热处理，以提高反应活性。在氧化过程中，Se-79 是一种半衰期较长的 FP，在氧化条件下会以 SeO 的形式释放出来，因此需要采用技术来捕获它。为捕获气态 SeO，制备了 CaO 颗粒（CPs）。研究了操作条件对氧化硒捕获性能的影响。CP 与 SeO 发生强烈反应，生成 CaSeO，在 700 °C 时的吸附容量高达 17.5 mol kg，吸附效率大于 99%。机械强度和热稳定性评估表明，这种材料适合实际应用。根据流速的不同，估算了处理 1 吨 SNF 时捕获 SeO 所需的氯化石蜡，从而有助于设计有效的 SeO 捕获系统，实现安全、可持续的核废料管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Engineering and Technology 工程技术-核科学技术

CiteScore

4.80

自引率

7.40%

发文量

431

审稿时长

3.5 months

期刊介绍： Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development