Symposium 'design method for thermal stress of concrete structures for nuclear power'

In nuclear reactor buildings, the effect of temperature condition accompanying the transient change that the atmospheric temperature in reactor containment vassels rises or drops when an accident is supposed is to be taken into account in the design. Various equations for the evaluation have been proposed for concrete structures, but as to the design method for the thermal stress of nuclear reactor buildings, the standard has not yet been established. Recently in Japan, the experimental studies related to the evaluation of thermal stress have been carried out on such objects as reactor containment vessels and reactor buildings made of concrete, therefore, for the purpose of exchanging the experience of those active in this field and search for the direction in which the thermal stress design of reactor buildings should advance, this symposium was held. Lectures were carried out on the present status of thermal stress design and the trend of the design method, the properties of concrete under the action of temperature, the thermal stress experiment on reinforced concrete beams and cylindrical structures, the thermal stress design for underground LNG tanks, the thermal stress and deformation of concrete structures and the examples of thermal stress design. (Kako, I.)