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Input

The relevant parts of the command line arguments passed to the neutronics code described in section 3.6.1.1 are also used in the thermal design code.

As usual the major part of the input parameters are retrieved through an input file as described in section 3.6.1.2. The input file name for the thermal design code is assumed to be of the form <input filename>.trm where the part <input filename> is specified by the command line arguments.

The contents of the thermal design code input file is listed below (in chronological order)

• Fuel pellet radius, R_f [m].
• Gap thickness, $d_{\mbox{\protect\scriptsize gap}}$ [m].
• Clad thickness, $d_{\mbox{\protect\scriptsize cl}}$ [m].
• Desired maximal distance (on the z-axis) between two successive temperature calculations [m].
• Gap conductance, $h_{\mbox{\protect\scriptsize gap}}$ [W/( ${\mbox{m}}^2\cdot$K)].
• Flux depression factor, $\cal F$ [--].

In Figure 12.3 we give an example input file for the thermal design code. Note that the smallest distance between two successive temperature calculations which can be obtained depends on the fineness of the hydraulics core grid.

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