Study On The Grounding Damage And Residual Strength Of The Marine Nuclear Power Platform

Marine nuclear power platform can provide a stable supply of energy for marine oil exploitation and open sea islands, with the increasing development of ocean, the demand for this new type of energy supply is also increasing, so the marine nuclear power platform has broad prospects for development. But at the same time, the radioactive material in the marine nuclear power platform has the potential danger, in the process of design, construction and operation must adhere to the principle of safety first. Grounding is one of the maritime accidents happened frequently in all kinds of ships, grounding refers to the contact-impact accident between ship bottom structure and the subsea obstacles like reefs, shoals or wrecks. Once the grounding accident happens, it may be cause the damage of the hull and the material leakage, and this can cause huge economic losses and serious environmental pollution, so the study on ship grounding is very significant, especially the study for the reactor module grounding of marine nuclear power platform.The study on grounding problem is very complicated, there are many factors influencing the grounding, and it is almost impossible to obtain a complete analytical solution through an accurate theoretical model. With the rapid development of computer technology, nonlinear finite element method is widely used in the research of ship grounding. Based on the previous study, this paper makes a numerical simulation study on the process of the reactor module grounding of one marine nuclear power platform with ABAQUS, and researches the residual strength after structure damaged by grounding. The specific study contents are as follows:1?Introducing the research background and significance of the grounding problem, and the research status and research methods of grounding and residual strength are summarized;2?The basic theory of the grounding damage are introduced, including various failure modes of basic component on the process of grounding, and introducing the experience formula for predicting ship grounding. It also introduces the basic principle of nonlinear finite element technique.3?Simulating the reactor module grounding of a marine nuclear power platform with finite element method, it analyzes the modeling method of simulation and introduces some key techniques of finite element modeling detailedly. Then simplifying the model and researching the deformation damage of the structure, the change of grounding force and the absorption and transformation of energy through the simulation results.4?The effect on the dynamic responses of the structures with various different grounding parameters are discussed, and researching the change of the grounding force and the energy absorption with different reef half apex angle, different friction coefficients, different grounding velocities and the structure with hole or not.5?Researching the residual strength of marine nuclear power platform after structure damaged by grounding. Calculating the floating state change of the marine nuclear power platform after the double bottom damaged, and then checking the residual strength through the residual strength checking criterion of American Bureau of shipping for double hull oil tankers combined with the numerical simulation results.