Mechanical evaluation of a 48Y cylinder during the IAEA fire test

From the TENERIFE results and using the DIBONA model we predict the thermal behavior and the inner pressure of an UF6 container engulfed in a fire recommended as by IAEA. Following this approach, the mechanical phenomena has been represented by elastic then plastic mechanisms. The experimental stress/strain curves have been implemented from CRIEPI tensile tests interpretation from ambient temperature up to 900 deg. C. The evolution of these previous curves according to the temperature, has been considered and extrapolated in term of minimal and maximal value. For every case of steel type and thickness value, we discuss and evaluate whether rupture occurs. Finally, our tool seems acceptable for predicting mechanical behaviour, but a rupture criterion has to be implemented into the model in order to predict the rupture time for every case. (authors)