Research of Neutron Characteristics of HFETR Irradiation Channels
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摘要: 采用蒙特卡洛(MCNP)程序对辐照孔道中子特性进行研究,包括各辐照孔道E>1.0 Me V时的中子注量率(φE1.0 Me Vf (29))与E>0.625 e V时的中子注量率(φE0.625 e Vf (29))的比值k,辐照孔道阳面、阴面样品中子注量率比值,辐照孔道样品最佳布置高度。研究结果表明:高通量工程试验堆(HFETR)辐照孔道k值随轴向和径向变化不同,但平均变化程度一致;9#孔道阳面、阴面材料快中子注量率比值达1.43,而G7、K11孔道阳面、阴面材料快中子注量率比值相对较小,分别为1.21和1.18。综合考虑,对于P15孔道,辐照试验段样品布置区的高度可达500 mm;对于9#孔道,样品布置高度可适当增至600 mm。Abstract: This paper studied the neutron characteristics of the irradiation channels in High Flux Engineering Text Reactor（HFETR） by employing the MCNP programs as calculation tools, including the ratio of the neutron fluxes of E＞1.0 MeV（φE（29）1.0 MeV） to the neutron fluxes of E＞0.625 e V（φE（29）0.625 eV） within the different channels, the fast neutron flux ratio of the material farthest and nearest away from the core, and the optimum arranging height of the materials. The results indicate that the k within the different channels varies differently with the changing of the axial and radial locations. However the average varying extent is identical. For the fast neutron flux ratios of the material farthest and nearest away from the core, the 9# channel is bigger（1.43）, while the G7 and K11 channels are smaller（1.21 and 1.18 respectively）. Comprehensively speaking, the arrangement height of the materials can reach 500 mm for P15 channel, and for the 9# channel, it can reach 600 mm.
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Key words:
- Irradiation channel /
- Neutron characteristics /
- MCNP /
- HFETR
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