عنوان مقاله [English]
Since the nuclear energy has been recognized as a useful energy, the subject of structure, operation and safety and environmental protection have also been important. In the nuclear reactors, one of the most dangerous accidents that can occur is the loss of coolant accident, that the most important of these events is the guillotine breaking in cold or hot leg coolant, which, this will melt the reactor core if it is not stopped. This paper presents one of the most dangerous accidents in reactor containments known as loss of coolant accident in its worst condition which is called large break loss of coolant accident. The specific type of large break loss of coolant accident is double ended cold leg break which means totally guillotine type of break in cold leg pipe. This modeling is performed in single volume method in Advanced Pressurized water reactor which is one of the most sophisticated safe reactors that has ever been built. The conservation mass and energy equations have been used in this modeling and the modeling software applied in our analysis is MATLAB, and the results are compared with the Advanced Pressurized-1000 water reactor safety, security and environmental reports.