Analysis of Temporary Cooling Strategy for CPR1000 Power Plant Under Situation Similar to Fukushima Severe Accident

The Fukushima Daiichi nuclear accident was a series of equipment failures, nuclear meltdowns, and releases of radioactive materials at the Fukushima I Nuclear Power Plant, following the Tōhoku earthquake and tsunami on 11 March 2011. According to the cause and process of Fukushima severe accident, several possible scenarios for CPR1000 nuclear power plant were analyzed in this paper, under the assumed situation similar to Fukushima severe accident, with the severe accident analysis code MAAP4. According to the analysis results, several weak points of CPR1000 power plant under situation similar to Fukushima accident were found. The electric power and cooling ability for CPR1000 power plant appear to be most important factors under such accident. Then, several temporary cooling strategies for CPR1000 power plant were suggested, including ASG water supply strategy, temporary injection strategy for primary loop, temporary injection strategy for secondary loop, which would improve the safety of CPR1000 power plant under the situation similar to Fukushima accident. At the last, assessments of effectiveness for these strategies were performed, and the results were compared with analysis without these strategies. The comparisons showed that correctly actions of these strategies would effectively prevent the accident process of CPR1000 power plant under situation similar to Fukushima accident.