APPLICABILITY EVALUATION OF STEEL PLATE REINFORCED CONCRETE STRUCTURE TO PRIMARY CONTAINMENT VESSEL OF BWRS (1) MECHANICAL AND THERMAL PROPERTIES OF CONCRETE UNDER HIGH TEMPERATURE CONDITIONS

摘要

In order to enhance the safety of BWRs and to shorten the period of construction, R&D project for applying steel plate reinforced concrete (SC) structure to primary containment vessel was started in fiscal 2008. As a first step in the development of steel plate reinforced concrete containment vessel (SCCV), the applicability of SCCV was examined from the point of view of structural aspects. In this basic study, mechanical properties (compressive strength, static modulus of elasticity, splitting tensile strength) and thermal properties (thermal strain coefficient, specific heat) of concrete under high temperature up to 300 °C were obtained as the basic data necessary to evaluate the applicability of SCCV under high temperature. The mechanical properties of concrete up to 300 °C are slightly higher than the values of Eurocode, but the decline tendency of mechanical properties against temperature is approximately same. The influence of long term heating on the mechanical properties is not significant. A little difference is observed between the experimental results on thermal properties and the model of Eurocode.