Safety analysis on steam line break accident of integral PWR

A system analysis of the double-ended rupture plus a 5cm break of main steam line break (MSLB) accident assumed to occur on integral PWR-200 has been conducted. The system and break model have been built using RELAP5 code. In this paper, we present the main operation parameters variation under MSLB, and compare them with Organization for Economic Cooperation and Development (OECD) benchmark problem. The results illustrate that due to SMR's core fuel assembly type and OTSG inherent features, there are significant difference compared to benchmark results. However, the simulation demonstrates IP200 is safe enough under the most severe MSLB accident. (author)