As a "Nuclear Safety Analyst", you are responsible for drawing up the appropriate models for simulating accident situations and for performing calculations using these models. This function specifically concerns thermohydraulic models of accident situations for which the usual one-dimensional thermohydraulic codes are not applicable or may be unreliable and for which CFD calculations are therefore required in order to make a reliable prediction. This relates to the choice to design the primary circuit as a 'pool' system, which has important advantages for safety but also makes the safety analysis more complex.
Accidents that necessitate the use of CFD include, for example, fractures of the reactor vessel and of pressurised structures in the reactor.
The development of reliable models for these accident situations requires a highly in-depth understanding of the theoretical background of thermohydraulics and how thermohydraulic problems can be correctly modelled and solved with existing CFD packages such as ANSYSFluent and OpenFOAM.
In many cases, the safety analyses require models and solutions that are innovative and scientific in nature and which can be published in the relevant professional literature.