加速器驱动次临界系统高能核数据库的制作及应用
Development and Application of High-energy Nuclear Data Library for Accelerator Driven Sub-critical System
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摘要: 加速器驱动次临界系统(ADS)是带高能外源驱动的系统，其质子能量高达GeV，同时散裂反应产生的散裂中子能量分布跨度大。由于目前高能核数据库的缺乏，在ADS核设计方面堆芯部分是基于20 MeV以下中子核数据库进行分析研究的。本文主要基于日本的JENDL-HE-2007高能中子评价数据库，使用NJOY程序加工部分关键核素的ACE格式数据库NECL-HE/MC，并使用MCNPX程序在数据库方面采用的高能散裂物理模型和NECL-HE/MC核数据库进行计算验证。验证结果表明，本文制作的NECL-HE/MC核数据库在ADS核设计中基本可靠。另一方面，应用NECL-HE/MC分析研究了不同能量段的散裂中子源对ADS的外中子源效率的影响，数值结果显示2.5%的高于20 MeV的散裂中子源对ADS的总外中子源效率的贡献接近20%。
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关键词:
- 高能核数据库 ,
- 加速器驱动次临界系统 ,
- 中子源效率
Abstract: With high-energy external source, the proton energy of accelerator driven sub-critical system (ADS) is up to GeV, and the energy of spallation neutron which is produced by the spallation reactions has great energy spans. Due to the lack of high energy nuclear library, the nuclear analysis of ADS design was based on the below 20 MeV neutron nuclear library. This paper was mainly based on the Japanese JENDL-HE-2007 high-energy neutrons evaluation library, using the NJOY to produce the ACE format data library of some key nuclides named NECL-HE/MC. Meanwhile, to validate NECL-HE/MC nuclear library, the high-energy physics model of MCNPX and NECL-HE/MC nuclear data library were compared. The results show that the NECL-HE/MC nuclear data library is reliable for ADS design. On the other hand, the effects of the different energy spallation neutron sources on the ADS external neutron source efficiency were analyzed with the application of the NECL-HE/MC. The results show that the above 20 MeV energy spallation neutron source which is 2.5% of the total number of spallation neutron source, contributes to about the 20% of the total external neutron source efficiency. -
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