Neutronics and Accident Analysis of Th-U-MOX Loading in Pebble Bed High-temperature Reactors
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摘要: 根据钍-铀混合氧化物燃料在高温气冷堆核电站示范工程(HTR-PM)框架下的中子学与瞬态事故特性,基于铀原子份额和燃料碳/重金属比例2种参数的参数分析,寻找混合氧化物(MOX)装载的优化方案。分析结果表明,随着碳/重金属比例的减小,单位产能对应的天然铀需求量降低,同时以失冷失压事故后燃料温度为代表的安全特性参数都逐渐恶化;最优化方案相比于HTR-PM实际燃料装载方案,可节省约8.5%的U3O8需求量[20 kg/(GW·d)];同时混合氧化物方案对钍燃料的利用率很低,仅为6%左右,必须进一步探索提高钍燃料在线利用率的途径。
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关键词:
- 钍基燃料循环 /
- 球床式高温气冷堆 /
- 钍-铀混合氧化物燃料 /
- 天然铀装载需求 /
- 失冷失压事故
Abstract: The neutronics and accidental features of HTR-PM with Th-U-MOX fuel loading are investigated. The parametric analysis is performed on the uranium fraction in MOX fuel and the C/HM ratio, for the optimization of Th-U-MOX loading. It is revealed that the requirement of natural uranium per energy production decreases when the C/HM ratio decreases. The optimized scheme reduces the uranium requirement for 8.5% and provides thorium utilization as low as 6%. -
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