提交时间： 2024-06-29
摘要： A new sub-critical reactorconcept is proposed as one accelerator splitting into multiple beams to drive the subcritical reactor in this work, which is so called Multi-Beam Accelerator Driven System (MB-ADS). The spallation target is designed as a unit similar to the fuel assembly. The high current proton beam is divided into multiple parts and injected into different targets located in the core to improve beam efficiency and flatten the spatial power distribution of the core. Based on different MB-ADSschemes, neutronics were conducted on the effects of beam splitting number, target assembly arrangements, fuel partitioning, and neutron data libraries. The results show that a reasonable multi-beam scheme can significantly improve the efficiency of the proton beam and flatten the power distribution of the reactor compared to the one target ADS scheme. Due to the improved beam efficiency, the beam density on the target window is greatly reduced.
分类： 能源科学 >> 能源（综合） 分类： 核科学技术 >> 裂变堆工程技术 分类： 核科学技术 >> 粒子加速器 分类： 核科学技术 >> 乏燃料后处理技术 提交时间： 2024-06-30
Huan Jia
Xunchao Zhang
Yuanshuai Qin
Xiaobo Li
Yuan He
Neng Pu
Hanjie Cai
Haihua Niu
Yulu Huang
Guirong Huang
Wei Wu
Xiaochong Zhu
Xiaoqiang Wei
Jonathan C. Wong
摘要： Accelerator Driven sub-critical System (ADS) is considered to be the most important candidate for nuclear waste transmutation. We propose a Multi-Target Accelerator Driven System (MTADS) to resolve two longstanding challenges of ADS, namely heat removal and the associated target lifetime, and inhomogeneous power distribution that affects burn-up of the reactor. An 18 mA, 1 GeV proton beam is split into 12 beams by radio frequency cavities and injected to 12 compact targets inside the reactor. With beam power of 18 MW, the sub-critical reactor is driven to 1500 MW thermal power. The peaking factor of the reactor is reduced to 1.7 by optimization of targets number and position for Multi Target Accelerator Driven System. The maximum beam current density is also reduced to 18.5 μA/cm2, which prolongs the beam window lifetime to 12 months with T91 steel. Towards the next generation ADS, the concept of MTADS simplifies the sub-critical system and increases the transmutation efficiency.
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