[en] When the number of cells is greater than several hundreds, and/or, the complexity of the system is very high like the reactor system, there may be some problems that have to be solved for the successful customization. The first problem that comes with large number of mesh cells is the time to finish the calculation is too long. The second problem that comes with the complex system, which means that the data base of the solid model is too big, and prohibits this approach altogether. The reason for this is that simply the Pro/E cannot handle too complex geometry. For example, a desktop workstation that has a 3.3 GHz CPU and a Quadrol FX 5600 graphic card cannot handle a system that has more than 150000 solid parts because it takes too long time to regenerate model data and it takes to long time to manipulating graphic data by graphic processor. Another problem is identified with the Pro/Tool kit API routines. The maximum memory size of the array that can be handled by the API is 4 mega bytes. Therefore, a limited number of solid parts can be handled in one time. Some more efforts should be exercised to solve these problems to get a powerful porosity calculation procedure

[en] This paper presents the results of the evaluation of the ATWS events with respect to Reactor Coolant System (RCS) overpressure and re-criticality for the European APR1400 (EU-APR1400) according to European Utility Requirement (EUR). This paper evaluates the ATWS impact on the EU-APR1400 by applying EUR. Based on the results of safety analysis for ATWS events, all the acceptance criteria for EUR can be satisfied due to the proper functioning of ATWS mitigation systems. However the four events are investigated only in this paper, and hence the results of this paper can not be concluded that the EU-APR1400 design satisfy all requirements for the EUR. Therefore, a further study for all Design Basis Event Category 2 (DBC2) events with ATWS needs to be performed in order to assess the comprehensive impact of ATWS events for the EU-APR1400 design