Study on Internal Flooding in Nuclear Power Plants Based on 3D Simulation Software CNIFA

In order to carry out safety assessment for internal flooding of nuclear power plants, the 3D simulation software CNIFA with independent intellectual property rights is developed, which is specially used for the analysis of internal flooding in nuclear power plants. In this paper, the 3D simulation software is used to analyze the internal flooding of the small reactor (ACP100) building, and suggestions for design improvement are put forward. Firstly, the physical model of scaled-down building is built, and the flooding spread in the room of nuclear power plant is simulated by experiments. Compared with the simulation results of CNIFA software, the results show that the software simulation has high accuracy. At the same time, the internal flooding of ACP100 reactor building is analyzed. Through software simulation analysis, it is known that the flooding height of the lowest floor room of the reactor building reaches 1.367 m, and relevant drainage measures should be considered. The 3D simulation analysis of internal flooding by CNIFA software has strong adaptability and good visualization, which can dynamically simulate the internal flooding scene of the nuclear power plant and show the whole process of flooding spreading, so as to formulate the flooding protection measures in a better way.