The raft foundation at the lower part of VVER-1200 reactor building is a cylindrical concrete structure, which is cast in one piece and belongs to the category of mass concrete construction.Because the temperature change and shrinkage caused by the hydration of the cementitious material in the mass concrete are easy to cause harmful temperature cracks in the concrete during the construction pouring to the curing age, it is necessary to carry out the research on the construction method and hydration heat of VVER-1200 nuclear island raft foundation concrete.Taking an actual VVER-1200 nuclear island raft foundation as the research object, the concrete pouring method was innovated, the finite element model of the lower raft foundation of the reactor building was established, the temperature field distribution of the lower raft foundation of the reactor building was analyzed in combination with the thermal test parameters of the project, and the change rule of the temperature field and temperature time history curve of the lower raft foundation of the reactor building with time was studied.The results show that the simulation analysis results of the transient temperature field of the raft foundation under the VVER-1200 reactor building are basically consistent with the temperature data measured in the project. The concrete construction method and the concrete simulation analysis method can effectively control the generation of harmful temperature cracks in the raft foundation of the nuclear island, which is of guiding significance to the construction of the raft foundation of the nuclear island of the same type of cylindrical nuclear power plant.
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Xiong et al. (2023) studied this question.