Numerical Research Of Ocean Nuclear Power Platform Single Point Mooring System's Hydrodynamic Performance

Exploration and utilization of nuclear energy is a very great achievement in the new times, nuclear power has been a part of many countries'power system, which carries huge implications to energy structure, production, global economy and political pattern. Nuclear electric power generation needs a lot of water, and for the safety of energy and environment, moving the nuclear power plant to the sea, and designing an efficient, environmental and safe ocean nuclear power platform is necessary. When the ocean nuclear power platform single point mooring system works in the sea, it faces with various kinds of irregular sea conditions, so to ensure the system's security and reliability, it's crutial to analyze the platform's hydrodynamic performance under different environmental loadings.The hydrodynamic performance of ocean nuclear power platform single point mooring system under environmental loading is studied in the following three aspects.The marine environment is complicated, the real wave has some characteristics of irregular wave, we assume that irregular wave is composed of unit waves with different wave length, amplitude and phase. A numerical computation is carried out to caculate the hydrodynamic performance of the platform under regular wave, the RAO conforms with the experiment results well, and analyze the trend of added mass and radiation damping of the platform with different drafts, the result indicates the draft of the platform has some effects on added mass and radiation damping.Through the numerical simulation of the system under irregular wave in working condition and installing and disentangling condition, the platform's motion response and mooring force is obtained. Analyze the draft and wave direction's effects on the system's motion response and mooring force, and compare the numerical and experiment results. The result indicates that the bigger the draft, the larger the motion response and mooring force. When the wave direction is 180°, the platform's surge and mooring force's component in x direction are smaller, and the platform's heave and mooring force's component in z direction are bigger.Through the numerical simulation of the system in wind wave and current, the platform's motion response and mooring force are obtained. Analyze the effects of the angle between wind wave and current on the system's motion response and mooring force, and compare the numerical and experiment results. The result indicates that when wind and wave are in the same direction, wind can offset the effect of wave on the platform, and when wind wave and current are in the same direction, current can intensify the effect of wave on the platform. When wind and wave are in the same direction, the bigger the angle between current and wave, the larger the platform's motion response, especially when the angle is 90°.