Dynamic Response Of Passive Containment Cooling System(PCCS) Under Sinusoidal Load

With the rapid development of economy, the demand of global energy increases rapidly,and the energy problem is more and more prominent. Due to the improvement of people environmental protection consciousness; the low utilization rate of photovoltaic, wind energy and other clean energy and more and more fossil fuels such as coal and oil is not adopted by people at the same time, nuclear power, as a more efficient and clean electric energy, is increasingly recognised by governments.AP1000 nuclear plant, as the key technology that China imported, has been widely researched. Nuclear structure, The special structure, nuclear structure, need to pay much attention on. Due to the high level of nuclear power plant structure security, and high temperature and high pressure condition of inner containment structure, Passive containment cooling system (PCCS) has become an important part of three generation of nuclear power technology. Because of the passive containment cooling system, the response of the nuclear structure under dynamic load is complicated. Take other papers studying the coupling effect between fluid and structure, dynamics analysis of PCCS nuclear tank structure has been done.Specific research work includes:1. According to AP1000 nuclear shielding structure and PCCS nuclear tank structure that constructed in China, the simplified characteristics for dynamic analysis has been decisided.Using the theory of Dunkerley and Timoshenko beam, the equation of fundamental frequency is derived.2. Three-dimensional finite element models were established in HyperMesh, using different type of elements. Export Nastran file, analyze the dynamic characteristics in finite element software, verify the applicability of the shell element in the structure modeling,reduce computational cost for subsequent time history analysis.3. The equation of fundamental frequency was solved in Matlab, the result was compared with natural frequency of finite element analysis. Comparison result illustrates the accuracy of the equation, also provides a relatively simple calculation method for future scientific research.4. The finite element analysis software ADINA was used to do modal analysis that take coupling effect between fluid and structure into account,and sloshing modal analysis of cooling water. The way how water depth influence coupling frequency and sloshing frequency was figered out.5. Three different adjusted sinusoidal loads which meet the code request were chosen to carry out implicit dynamic analysis of the finite element model with/without water. The influence between the load frequency and wave hight, also Mises stress were clearfied. The way how the existence of the cooling water influence on structural response was illuminated.Above all, the results show that strength meets the code requirements.