Abstract This work aimed to develop accelerator-driven systems (ADSs) with a subcritical thorium assembly for fuel breeding and clean energy utilization by using several seed fuels. The ADS reactor core was loaded with three different fuel types, namely, reprocessed fuel, UN, and UO2 (seed fuel) associated separately with ThO2 fuel (blanket) in a heterogeneous approach. The Monte Carlo code MCNPX 2.7.0 has been employed to calculate neutronic parameters such as the effective multiplication coefficient (Keff), the nuclear fuel evolution during the burnup for every case, and the power fraction from seed and blanket fuels. The results indicate that the utilization of thorium (without any contents of 233U at the beginning of cycle) with reprocessed fuel allowed more 233U production than the UN and UO2 cases but with shorter cycle length. Introducing thorium fuel with the UN into the ADS core presented an efficient method to produce thermal power with the longest cycle length approaching 20 years.

中文翻译：

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加速器驱动亚临界系统中含钍不同种子燃料的研究

摘要 本工作旨在开发具有亚临界钍组件的加速器驱动系统 (ADS)，用于通过使用多种种子燃料进行燃料育种和清洁能源利用。ADS 反应堆堆芯装载了三种不同的燃料类型，即后处理燃料、UN 和 UO2（种子燃料），分别与 ThO2 燃料（覆盖层）以非均相方法连接。蒙特卡罗代码 MCNPX 2.7.0 已被用于计算中子参数，例如有效倍增系数 (Keff)、每种情况下燃耗期间的核燃料演化以及来自种子和毯状燃料的功率分数。结果表明，使用钍（在循环开始时没有任何 233U 含量）和再加工燃料允许比 UN 和 UO2 情况下更多的 233U 生产，但循环长度更短。