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Overview

As the reader may have discovered the author has done all possible to separate the neutronics and thermal-hydraulics calculations. The reasons for this separation is described below

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Flexibility: The neutronics calculation can be done without knowing how the thermal-hydraulics calculation is done in practice, and vice versa. The most important consequence is that it is possible to have separate computational grids in the two model descriptions of the core.

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Reliability: When the neutronics does not access information in the global structure of the thermal-hydraulics code and vice versa it is possible to rule out subtle side effects in a module which originates from outside the module. That is we have encapsulated the neutronics and thermal-hydraulics calculations.

Note that we have chosen not to separate the hydraulics and thermal design models because these two models are so closely related. As a consequence the thermal design code accesses the results of the core hydraulics code directly which implies that the temperature calculations can only be carried out at a subset of the z-coordinates in the computational grid of the core hydraulics code.

The separation of the neutronics and thermal-hydraulics models implies that when we wish to couple the models together we need an interface we serve as a link between the models. The author has therefore constructed a separate module, interface.c, which holds all the functions for the establishment of this link.

Before going into detail with the implementation of the interface we show in Figure 13.1 the intersystem coupling of the coupled model.

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