The utilization of fossil energies, such as coal, petroleum and natural gas, has had great influence on human's survival, development and progress. In the 21st century, people pay more attention to the quality of living environment and living space. The greenhouse effect and acid rain caused by massive use of fossil energies have caused serious damage to human's living environment. Moreover, after long-term exploitation, fossil energies are gradually exhausted to the extent that they are not enough to support the development of the global economy. When looking for alternative energies, people begin to pay more and more attention to the application of nuclear energy, mainly the nuclear energy power generation. Development of nuclear power is the main direction of future energy structure adjustment in China, and the investment in the nuclear power station will greatly exceed that in conventional power plants. The national strategy for nuclear power development has changed from "moderate development" to "positive development".