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Output description

The output from the program consists a part from a limited output to screen exclusively of a file with the name <input filename>.mat; a so-called mat-file. This file holds all important information from the neutronics computation and is supposed to be used together with MATLAB. The contents of the file is retrieved by issuing load <input filename> in the MATLAB command window. Having executed the MATLAB command the so-called MATLAB workspace holds the following variables:

l

A column vector which holds the steplengths in the computational grid, h_k, for every region k in the reactor [cm].

l

A matrix which holds the flux solution normalized to 1--the gth group flux at every z-coordinate in the reactor is found in the gth column of the flux-matrix.

l

A column vector which holds the linear heat generation rate, q_k', in the regions situated in the reactor core [W/m].

l

A column vector which specifies the z-coordinates in the used computational grid [cm].

l

A column vector which specifies the z-coordinates for the computational grid within the core [cm].

l

A column vector which contains the steplengths in the grid within the core [cm].

l

A simple variable which holds the calculated (fundamental) eigenvalue.

l

A simple variable which holds the level of the normalized fluxes [neutrons/ $({\mbox{s}} \cdot {\mbox{cm}}^2)$].

One of the convenient features of using a mat-file is that only one file suffices since both the values and the variable name are stored instead of writing several ASCII files; one for each variable. Most importantly, using a mat-file opens up for all the nice features of MATLAB during the pre-processing phase. Finally, the mat-file requires less storage compared to the ASCII files, at least when working in double precision.

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