This study aims to achieve precise physical analysis of WER-1000 nuclear reactors.Based on Bamboo-C,an advanced PWR core physical analysis software developed by Xi'an Jiaotong University,a thorough methodological study is carried out.The research encompasses:in the aspect of assembly calculation,methods based on Constructive Solid Geometry(CSG)for hexagonal transport calculations and detailed modeling techniques for heavy reflector layers were studied;in core calculation,a method combining conformal mapping and nonlinear iterative strategies for hexagonal fuel assembly neutron diffusion was investigated.Using Bamboo-C,modeling calculations were performed for three consecutive fuel cycles of start-up physical experiments and power operations of a specific VVER-1000 unit,followed by a comparative analysis with actual measured data.The results indicate:①in the start-up physical tests,the average error of critical boron concentration is-5.0ppm(1ppm=10-6);the average errors of the moderator temperature coefficient and the isothermal temperature coefficient are 0.3 pcm/K and 0.9 pcm/K(1pcm=10-5),respectively;the average error of the boron worth is-5.0％;and the average error in control rod worth is-7.8％.②During power operations,the average errors of critical boron concentration for three cycles were-2.3ppm,-18.9ppm,and-7.8ppm,respectively;the average errors in the core power distribution for the three cycles were-0.010(for assembly relative power greater than 1)and 0.012(for assembly power less than 1).Therefore,Bamboo-C software meets the industrial threshold requirements for calculation errors of key physical quantities in the VVER-1000 reactor core,demonstrating its capability for engineering application.
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