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This paper provides a method aimed at calculating the internal structure of reactor building equalling to a simplified Point-Beam model which used for the main equipment reactions. The main equipment in third generation pressurized water nuclear power plant mainly includes reactor vessel, main pumps, steam generator and pressurizer. These equipment are huge and heavy, supported on concrete structure. It is necessary to consider the globe effect and combined to the concrete structure. So that a simplified point-beam model is need. In this paper, according to the floor elevation of the internal structure, the floors are divided into sections of rigid beams, and the overall stiffness of the floors and the inter-floor wall is calculated by finite element model. The floor mass includes the floor slab and half the mass of the upper and lower walls. Due to the calculation results, the floors are simplified into mass points with the same stiffness and mass. The interlayer wall is equivalent to a beam element with corresponding stiffness. The coordinate position of the mass point should be consistent with the center of mass of the floor, and the position of the beam unit should be consistent with the rigid center of the floor wall. A simplified point-beam FE model is established by connecting beam elements and mass points. The simplified point beam finite element model (FEM) of the internal structure only includes the quality of the concrete structure and water in tanks, not the quality of the main equipment. Finally, the structural dynamic characteristics of the obtained simplified point-beam FEM should be consistent with or approximate to the original structure model. This obtained simplified point-beam model can be used to calculate the overall mechanical and dynamic properties of the structure. And as an interface also, the designer of the main equipment can be equivalent to the mass point coupling with the established simplified point-beam FE model, to calculate the coupling effect between the main equipment and the concrete structure.

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An Equivalently Simplified Point-Beam Model Calculation for the Internal Structure of Reactor Building

  • 会议论文

  • 发表日期：

    2026年

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  • Yuanda Liu,
  • Chunlong Zhang,
  • Xiting Wu

摘要

This paper provides a method aimed at calculating the internal structure of reactor building equalling to a simplified Point-Beam model which used for the main equipment reactions. The main equipment in third generation pressurized water nuclear power plant mainly includes reactor vessel, main pumps, steam generator and pressurizer. These equipment are huge and heavy, supported on concrete structure. It is necessary to consider the globe effect and combined to the concrete structure. So that a simplified point-beam model is need. In this paper, according to the floor elevation of the internal structure, the floors are divided into sections of rigid beams, and the overall stiffness of the floors and the inter-floor wall is calculated by finite element model. The floor mass includes the floor slab and half the mass of the upper and lower walls. Due to the calculation results, the floors are simplified into mass points with the same stiffness and mass. The interlayer wall is equivalent to a beam element with corresponding stiffness. The coordinate position of the mass point should be consistent with the center of mass of the floor, and the position of the beam unit should be consistent with the rigid center of the floor wall. A simplified point-beam FE model is established by connecting beam elements and mass points. The simplified point beam finite element model (FEM) of the internal structure only includes the quality of the concrete structure and water in tanks, not the quality of the main equipment. Finally, the structural dynamic characteristics of the obtained simplified point-beam FEM should be consistent with or approximate to the original structure model. This obtained simplified point-beam model can be used to calculate the overall mechanical and dynamic properties of the structure. And as an interface also, the designer of the main equipment can be equivalent to the mass point coupling with the established simplified point-beam FE model, to calculate the coupling effect between the main equipment and the concrete structure.