Abstract
On March 11, 2011, an earthquake occurred in the northeastern part of Japan. The Fukushima Nuclear Power Plant was in a state of multiple safety systems failure due to the earthquake and tsunami. The loss of coolant water and electricity for a long time caused serious accidents, resulting in hydrogen explosion, melting of the core, and release of radioactive products. These problems also made the world pay more attention to the serious accident safety analysis of nuclear energy. Based on the Maanshan Nuclear Power Plant in Taiwan, this study used MELCOR2.2 to simulate a hypothetical ELAP combined with a hot leg creep rupture transient accident. In Sandia's report on the Fukushima incident [1], it was mentioned that the main steam pipe of the Fukushima No. 1 power plant occurred creep rupture due to high temperature and high pressure steam in the preaccident. In the analysis of the Surry nuclear power plant [2], it was also found that the PWR nuclear power plant also occurred creep rupture in the hot leg and the U-tube in the SBO event that exceeded the Design Basis Accident Analysis (DBA).Therefore, in order to analyze the various events that Maanshan Nuclear Power Plant encounter, this study assumes a conservative ELAP case to observe creep rupture of the hot leg, displacement of fuel and when hydrogen combustion occurs.