An active carbon absorber is mainly used for radioactive iodine absorption and gas purification in an nuclear power plant.According to technical requirement of the Type Ⅲ absorber developed at Shanghai Nuclear Engineering Research and Design Institute

finite element analysis(FEA) was used for its mechanics analysis.Static analysis under dead weight

design pressure and operating pressure

modal analysis

and seismic analysis were performed.The structure integrity of Type Ⅲ active carbon iodine absorber was satisfied under different service conditions.The structure weakness was clarified under static and seismic loads

and the structure design was improved based on the FEA results.