Recently the development of graphical methods using the ISAAC code’s calculation data has been started in order to show the Wolsong 1 & 2 PHWR plants behaviour during the severe accidents. This graphic model is designed to provide two basic functions: one is to provide the graphical display of several plants systems together with the important parameters. For example, the representative T/H behaviour, fuel behaviour, fuel channel behaviour, reactor core behaviour, containment behaviour and fission product behaviour are going to be displayed in a graphic window. The other function is the control capability equipped with the controllable valves and pumps in the PHWR SAMG. In this paper, details of the elementary technical aspects of the ISAAC graphic model are presented which are the system structure, ISAAC variable definition, data communication methods and graphical display generation.

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