Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
In the present work, one of the studies performed by the Universidad Politécnica de Madrid research group within McSAFER H2020 European project is presented. This project is pursuing the aim of improving the research in the safety simulations by means of the application of conventional and advanced modeling tools to several SMRs designs. In particular, this study is focused on the modeling of the boron dilution sequence in the NuScale SMR caused by the malfunction of the Chemical and Volume Control System (CVCS) with an asymmetrical injection of the FeedWater (FW) system. By doing so, it is possible to assess the impact on the main plant parameters and on the transient evolution of asymmetrical effects which are forced to take place in the RCS.
The modeling of the NuScale Power Module is performed using the system code TRACE following two lines of work based on the application of 1D and 3D components for the modeling of the primary side, respectively. Finally, the comparison between the results of the simulations obtained applying both modeling approaches is made showing that the 3D effects are almost completely absorbed by the performance of the Helically Coiled Steam Generators (HCSG) and that TRACE is able to capture the physics involved in the boron dilution sequence in NuScale.
