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首页> 外文期刊>World Journal of Nuclear Science and Technology >An Integrated Process for Recycling of ThO2 Based Mixed Oxide Rejected Nuclear Fuel Pellets
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An Integrated Process for Recycling of ThO2 Based Mixed Oxide Rejected Nuclear Fuel Pellets

机译：基于ThO 2 的混合氧化物排斥核燃料颗粒的回收综合工艺。

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This paper presents a study on the process engineering aspects of relevance to the industrial implementation of ThO2 and (Th, U)O2 mixed oxide (MOX) pellet type fuel manufacturing. The paper in particular focuses on the recycling of thoria based fuel production scrap which is an economically important component in the fuel manufacturing process. The thoria based fuels are envisaged for Advanced Heavy Water Reactor (AHWR) and other reactors important to the Indian Nuclear Power Programme. A process was developed for recycling the chemically clean, off-specification and defective sintered ThO2 and (Th, U)O2 MOX nuclear fuel pellets. ThO2 doesn’t undergo oxidation or reduction and thus, more traditional methods of recycling are impractical. The integrated process was developed by combining three basic approaches of recycling namely mechanical micronisation, air oxidation (for MOX) and microwave dissolution-denitration. A thorough investigation of the influence of several variables as heating method, UO2 content, fluoride and polyvinyl alcohol (PVA) addition during microwave dissolution-denitration was recorded on the product characteristics. The suitability evaluation of the recycled powder for re-fabrication of the fuel was carried out by analyzing the particle size, BET specific surface area, phase using XRD, bulk density and impurities. The physical and chemical properties of recycled powder obtained from the sintered (Th1-y, Uy)O2 (y; 0 - 30 wt%) pellets advocate 100% utilisation for fuel re-fabrication. Recycled ThO2 by integrated process showed distinctly high sinterability compared to standard powder evaluated in terms of surface area and particle size.
机译：本文就与ThO 2 和（Th，U）O 2 混合氧化物（MOX）颗粒燃料制造的工业实施相关的过程工程方面进行了研究。本文特别关注基于氧化的燃料生产废料的回收，该废料是燃料制造过程中的经济上重要的组成部分。设想将基于的燃料用于高级重水反应堆（AHWR）和对印度核电计划很重要的其他反应堆。开发了一种循环利用化学清洁，不合格和有缺陷的烧结ThO 2 和（Th，U）O 2 MOX核燃料芯块的工艺。 ThO 2 不会发生氧化或还原，因此，更传统的回收方法不切实际。通过结合三种基本的回收方法，即机械微粉化，空气氧化（用于MOX）和微波溶解-浓缩，开发出了集成工艺。记录了微波加热溶解过程中加热方法，UO 2 含量，氟化物和聚乙烯醇（PVA）添加等变量对产品性能的影响。通过分析粒度，BET比表面积，使用XRD的相，堆积密度和杂质，对再生粉末进行燃料再造的适用性评估。从烧结的（Th 1-y ，Uy）O 2 （y; 0-30 wt％）颗粒获得的回收粉末的物理和化学性质主张100％的利用率用于燃料的再制造。通过一体化工艺回收的ThO 2 与标准粉末相比，在表面积和粒径方面表现出明显高的烧结性。

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