核电厂生物屏蔽门优化研究

Study on the Optimization of the Biological Shielding Gate of Nuclear Power Plant

利用MCNP5程序构建了核电厂生物屏蔽门中子屏蔽装置,模拟了质量分数10%的含硼聚丙烯、铜、石墨、钨镍合金等材料对中子的慢化和屏蔽效果,得到不同材料在不同厚度下的粒子屏蔽效果。MCNP5程序结果表明:选取19 cm的三层复合屏蔽结构,第一层屏蔽材料选用10 cm厚的铜,第二层屏蔽材料选用5.5 cm厚的含硼聚丙烯,第三层屏蔽材料选用3.5 cm厚的铅。三层复合屏蔽结构对中子屏蔽率达到98.4%,对γ射线屏蔽率达到96.1%,可提供连续性生物屏蔽,保证电厂辐射防护安全。

A neutron shielding device for the biological shielding gates of nuclear power plants was constructed by using the MCNP5 program.The neutron moderation and shielding effects of 10%boron-containing polypropylene.copper,graphite,tungsten-nickel alloy and other materials were simulated,and the particle shielding effect of different materials at different thicknesses were obtained.The results of the MCNP5 program show that a 19 cm three-layer composite shielding structure is selected,the first layer of the shielding material is copper with a thickness of 10 cm.the second layer of the shielding material is selected from boron-containing polypropylene with a thickness of 5.5 cm.and the third layer of the shielding material is selected from lead with a thickness of 3.5 cm.The three-layer composite shielding structure has a neutron shielding rate of 98.4%and a gamma ray shielding rate of 96.1%.which can provide continuous biological shielding and ensure the radiation protection safety of the power plant.