ADS实验大厅中子防护工程技术研究

为了保障加速器驱动次临界系统(ADS)散裂靶与反应堆耦合特性及影响验证实验的顺利进行,以原子能院现有的临界实验装置为基础,对堆厅部分墙体进行屏蔽改造。建造由聚乙烯、镉、铅、钢以及混凝土等材料构成的屏蔽装置,以防止临界装置产生的射线外泄,使工作人员受到的照射保持在合理水平。通过MCNP模拟计算,完成了屏蔽结构的优化设计。基于槽钢支撑结构、铅屏蔽层、镉屏蔽层和聚乙烯屏蔽层等材料组成的组合屏蔽结构建立简化模型,采用ANSYS有限元分析程序计算分析得出各部分应力小于许用应力,稳定性符合要求。最后通过工程实践,完成对屏蔽性能理论计算结果的验证。

Research on neutron shielding engineering in ADS experimental hall

The shielding of the reactor hall of China Institute of Atomic Energy (CIAE) was reconstructed on the basis of the existing critical experimental device at CIAE, for guaranteeing the smooth work of validation experiment research on the coupling features between spallation target of the accelerator-driven sub-critical system (ADS) and the reactor. A shielding device consisting of polyethylene, cadmium, lead, steel and concrete is constructed to prevent the radiation leakage from the critical device and to control radiation on workers at a reasonable low level. The optimum design of shielding structure is completed by MCNP simulation calculation. In addition, based on the composite shielding structure composed of channel steel support structure, lead shielding layer, cadmium shielding layer and polyethylene shielding layer, a simplified model is established. The ANSYS finite element analysis program is used to calculate and analyze the stress of each part, which is less than the allowable stress, and the stability meets the requirements. The verification of theoretical calculation is completed with an engineering practice,