乏燃料容器坠落事故工况下核燃料厂房的安全性分析

According to the technological arrangement of a nuclear power plant, impact response effects of a fuel container dropping accident on the fuel plant building should be considered in the design. In order to ensure the safety of the nuclear power plant structure and the spent fuel pool, it is an effective measure to lay an AAC (autoclaved aerated concrete) masonry with a certain thickness to absorb the impact energy at the areas where the spent fuel container may drop. First, the hammer impact test of the AAC block was simulated to calibrate the parameters of the constitutive model MAT96 by using the ANSYS/LS-DYNA. Then,a FE(finite element)model of the whole fuel plant building was set up using solid elements and layered shell elements, and the impact response of the building under the condition of the spent fuel container dropping was analysed. Finally, from the aspects of the principal strain of concrete, the deflection of spent fuel pool and the floor response spectrum, a safety analysis of the whole fuel plant building was conducted. The results show that the AAC buffer layer with the thickness of 5 meters can effctively guarantee the safety and function of the building with slabs at the dropping position and surrounding walls slightly damaged and the spent fuel pool still well preserved. With regard to the equipments in the spent fuel pool, the floor impact response spectrum may exceed the design responce spectrum at certain frequency scope. So further special checking calculations of the equipments should be carried out.