Heat transfer and stress analysis of reactor containment building for various concrete mix proportions in severe weather conditions

摘要

Estimation of concrete cracking due to hydration heat in mass concrete such as reactor containment building (RCB) in nuclear power plant is a crucial issue in construction site. In this study, the numerical analysis for heat transfer and stress development is achieved for the containment wall in RCB by considering the various concrete mix proportions. Finally, concrete cracking risk in severe weather such as hot and cold weather is discussed based on analysis results. In analyses considering severe weather conditions, it is found that the through-wall cracking risk in cold weather is high due to the abrupt temperature difference between inside concrete and the ambient air in cold region. In hot weather, temperature differences between inner and outer face is relatively small, and accordingly the relevant cracking risk is relatively low in contrast with cold weather.