Core degradation modeling of CANDU severe accident code, CAISER

For the perspective of a regulation body, it is difficult to review the AMP report with the separate severe accident code with high accuracy. Although the MAAP-ISAAC code is developed in Korea based on MAAP code, through the recent deputy for the ownership of ISAAC code, the ownership of MAAP-ISAAC code is decided to belong to EPRI, which developed MAAP code, because the MAAPISAAC code was considered as one of the derivatives of MAAP code From the above mentioned background, the necessity for the development of CANDU severe accident code with high accuracy is raised. Hence, KAERI started the project to develop the detailed CANDU severe accident code from last year with 5 years plan. In this paper, the node system of a fuel channel and calandria tank, the main core degradation mechanism is described. From the necessity for the CANDU severe accident code having high accuracy to evaluate the allowable criterion on AMP, the detailed severe accident simulation code for CANDU reactor, CAISER has been developing in KAERI. The fuel channel module considers the water level change in a fuel channel, the melt & relocation process in a fuel channel, and the local thermal failure of a fuel channel by using 3- dimensional Cartesian coordinate node system.