Optimization Study on Shielding Design for Horizontal Ducts of China Advanced Research Reactor
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摘要: 考虑辐射安全和经济性,对中国先进研究堆(CARR)的水平烫源孔道作了屏蔽设计优化研究。通过分步计算,克服了MCNP4C在计算粒子深穿透问题中的耗时、结果差的缺陷。再建立模型,将转门的屏蔽设计优化问题转化为屏蔽材料的组合优化问题。使用特征统计算法(CSA)结合ANISN程序,编写屏蔽设计优化程序。经过大量方案的筛选,很快找到了符合辐射安全、经济性和材料的机械特性的屏蔽设计优化方案optCH2;用MCNP4C程序计算了优化的方案,并与原方案做了比较。结果表明,optCH2方案的安全性能和经济性都比原方案提高很多。Abstract: Considering the radiation security and economy factors,optimization study is done on the shielding design for the horizontal heat source ducts of China advanced research reactor（CARR）.Disadvan-tages of time consuming and inaccurate calculation results with MCNP4C when calculating the deep penetra-tion problems are avoided by step calculation.When re-building the model,the optimization problem of shielding design for revolving door is converted into a combined optimization problem of shielding materials.Characteristic statistic algorithm（CSA） is combined with ANISN program and then optimization program of shielding design is developed.After searching for large numbers of schemes,the optimal scheme of optCH2 is found,which meets the need of radiation security,economy and mechanical performance of materials.Then optimal scheme is calculated using MCNP4C program and compared with the former ones.The results show that the optCH2 scheme is much better than the original one both in security and economy.
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