Abstract
Rapid bursting tests using the Tube Rupture Simulation Test Rig (TRUST-2) and its overheating rupture analyses were carried out on the 2·1/4Cr-1Mo steel tube under an internal pressure load with extraordinarily high temperature condition. The tube failure behaviors were classified into three patterns of the ductile failure, the creep failure, and the ductile failure accompanied by creep, depending on the test conditions. In comparison between the test and the analysis on the creep failure and the ductile failure accompanied by creep, the time to failure of the analysis is estimated 25-50% shorter than that of the test, and the analysis is considered to be conservative. On the ductile failure, the times to failure of the test and the analysis become close but that of the analysis is still estimated about 10% shorter; the temperature to failure of the analysis is calculated about 100°C lower than that of the test; therefore, the conservatism of the analysis is confirmed. On the creep failure, if the time coefficient of the analysis is given about 1.5-2, the time to failure of the analysis becomes close to that of the test, which means that the analysis by use of the time coefficient 3 results in having the safety margin of 1.5-2 in the application to the Prototype FBR MONJU.
