A study of RPV depressurization and containment vent strategy in Fukushima like accident of Chinshan NPP by using MAAP5

On 2011 March 11, several units of the Fukushima nuclear power plant experienced a total loss of power and water supply, which was triggered by a heavy earthquake and following tsunami. In the Fukushima accident, it was considered too late to inject sea water into reactors. After Fukushima, Taiwan Power Company developed an improved measure to prevent the accident, if either AC power or reactor water supply cannot be restored in time. This improved measure was named the DIVing strategy, abbreviated from system Depressurization, water Injection and containment Venting. Once the appropriate plant conditions are reached, the DIVing strategy will be activated. In this study, MAAP5 was used to simulate a Fukushima-like accident in the Chinshan Nuclear Power Plant, which is a BWR-4 nuclear power plant with Mark-I type containment, to verify the DIVing strategy. (author)