FINITE ELEMENT ANALYSIS OF AIRCRAFT CRASH AND ITS SUBSEQENT FIRE EFFECTS ON NUCLEAR CONTAINMENT STRUCTURE

Abstract

After the terrorists attack on ii September 2011 the safety measurement of nuclear power plant for a commercial aircraft has been performed world-wide, most of the studies focused on the techniques of impact analysis. In this study a logical procedure to evaluate the fire introduced stresses along with the impact on a nuclear containment subjected to an aircraft crash is suggested. The intensity, duration and distribution of the fire are determined based on aircraft crash analyses and characteristics of jet fuel. To predict the response of the BWR Mark Ill type containment Abaqus [1/lmplicit finite element code was used. For the impact analysis Reira[14] force history curve was used to apply the load on the containment. Both the heat transfer analysis and thermal stress analysis were done by taking the material properties based on the conditions and type of analysis. In order to predict the behavior of concrete, the concrete damaged plasticity model was employed while in order to predict the behavior of reinforcement the Johnson-Cook elasto-viscoplastic material model was used. The crash of the aircraft was considered to take place at midpoint of the cylindrical portion. The properties of the material at elevated temperature were taken from Euro codes