Optimization Study on Shielding Design for Horizontal Ducts of China Advanced Research Reactor

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.