Because of the double heterogeneity of double heterogeneous (DH) system with both dispersed particle-type fuel and burnable poison, the traditional volumetric homogenization method (VHM) on DH systems will bring unacceptable calculation deviation. IRPT (Improved Reactivity-Equivalent Physical Transformation) method applied to some DH systems which have both particle-type dispersed fuel and burnable poison has the features of simplicity and high calculation accuracy. The calculations in this article show that IRPT method becomes invalid for some DH systems when volume fraction of dispersed particle-type burnable poison is relatively high or the absorb cross section of burnable poison particles is relatively large. And then Ring RPT method is can be used to the DH system with both dispersed particle-type fuel and burnable poison. Results of depletion calculations for different types of dispersed particle-type burnable poisons and the comparison with Mote Cola results of grain models prove the validity of Ring RPT method, preliminary conclusion can be obtained that Ring RPT method has wider scope of usage and higher accuracy than IRPT method.

中文翻译：

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含分散颗粒型燃料和可燃毒物的 DH 系统的环 RPT 方法

由于双异质（DH）系统同时具有分散颗粒型燃料和可燃毒物的双重异质性，传统的体积均质法（VHM）对DH系统会带来不可接受的计算偏差。IRPT（Improved Reactivity-Equivalent Physical Transformation）方法适用于一些既有粒子型分散燃料又有可燃毒物的DH系统，具有简单、计算精度高的特点。本文的计算表明，当分散颗粒型可燃毒物的体积分数较高或可燃毒物颗粒的吸收截面较大时，IRPT方法对某些DH系统无效。然后Ring RPT方法可用于具有分散颗粒型燃料和可燃毒物的DH系统。