The results of modeling the form change and cracking of graphite blocks under exposure to heat and radiation at the stage of their secondary swelling within the scope of scientific and technical support for the restoration of the lifespan characteristics of the graphite stack of power units with RBMK-1000 in order to predict the deformed state of graphite at the final stages of operation of channel reactors are reported. To improve the convergence of the calculated and actual formation and development of cracks, an algorithm based on an analysis of the results of in-reactor control was developed. The algorithm contains information about crack growth over different control periods, taking into account the correction for crack opening from the force action of graphite columns one on top of the other due to restrained deformation. The developed approaches have been successfully tested on the example of the graphite stacks of the No. 1 unit of the Leningrad NPP and the No. 2 unit of the Kursk NPP.

对石墨块在二次膨胀阶段受热和辐射时的形态变化和开裂进行建模的结果，在科学技术支持范围内用 RBMK- 恢复动力装置石墨堆的寿命特性- 1000 以预测石墨在通道反应器运行的最后阶段的变形状态。为了提高计算结果和实际裂缝形成和发展的收敛性，开发了一种基于反应堆内控制结果分析的算法。该算法包含有关不同控制周期内裂纹扩展的信息，同时考虑到由于受约束变形导致的石墨柱在另一个顶部的力作用对裂纹张开的校正。