Hexagonal mesh detector (dh)

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Yrobel
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Hexagonal mesh detector (dh)

Post by Yrobel » Thu Apr 18, 2019 3:12 am

Hi,
How to determine the neutron flux in units (n/cm2/s) at the reactor core midplane using the hexagonal mesh detector (dh).

Code: Select all

det HexFLUX dh 3 0 0 11.323 27 27 0 0 1 du 0
This is the core lattice corresponding to the dh detector:

Code: Select all

lat 50  3  0.0 0.0 27 27 11.323      % ---- B - Shield ; R -  Reflector, C - CSD; D - DSD; F - Fuel assembly

O O O O O O O O O O O O O O O O O O O O O O O O O O O
 O O O O O O O O O O O O O B B B B B B B B B B B B B O
  O O O O O O O O O O O O B B B B B B B B B B B B B B O
   O O O O O O O O O O O B B B B B B B B B B B B B B B O
    O O O O O O O O O O B B B R R R R R R R R R R B B B O
     O O O O O O O O O B B B R R R R R R R R R R R B B B O
      O O O O O O O O B B B R R R R R R R R R R R R B B B O
       O O O O O O O B B B R R R R R R D R R R R R R B B B O
        O O O O O O B B B R R R R F F F F F F R R R R B B B O 
         O O O O O B B B R R R R F F F F F F F R R R R B B B O
          O O O O B B B R R R C F F F F F F F F C R R R B B B O
           O O O B B B R R R R F F F C F F F F F R R R R B B B O
            O O B B B R R R R F F F F F F F F F F R R R R B B B O
             O B B B R R R R F F F F F D F C F F F R R R R B B B O
              O B B B R R R R F F F F F F F F F F R R R R B B B O O
               O B B B R R R R F F F C F F F F F R R R R B B B O O O
                O B B B R R R D F F F F F F F F D R R R B B B O O O O
                 O B B B R R R R F F F F F F F R R R R B B B O O O O O
                  O B B B R R R R F F F F F F R R R R B B B O O O O O O
                   O B B B R R R R R R C R R R R R R B B B O O O O O O O
                    O B B B R R R R R R R R R R R R B B B O O O O O O O O
                     O B B B R R R R R R R R R R R B B B O O O O O O O O O
                      O B B B R R R R R R R R R R B B B O O O O O O O O O O
                       O B B B B B B B B B B B B B B B O O O O O O O O O O O
                        O B B B B B B B B B B B B B B O O O O O O O O O O O O
                         O B B B B B B B B B B B B B O O O O O O O O O O O O O
                          O O O O O O O O O O O O O O O O O O O O O O O O O O O

% ------------------------------------------------
% --- UNIVERSE 0
% ------------------------------------------------
surf CORE  hexxprism    0.0  0.0  128.24 -163  132

cell CORE1  0  fill     50  -CORE
cell CORE2  0  outside     CORE
% ------------------------------------------------
In the output file I get 27*27 values, these correspond to each cell (assembly) in the core lattice?, also in what order these output values are taken?. Here the first 27 output values:

Code: Select all

DETHexFLUX = [
    1    1    1    1    1    1    1    1    1    1  0.00000E+00 0.00000 
    2    1    1    1    1    1    1    1    1    2  0.00000E+00 0.00000 
    3    1    1    1    1    1    1    1    1    3  0.00000E+00 0.00000 
    4    1    1    1    1    1    1    1    1    4  0.00000E+00 0.00000 
    5    1    1    1    1    1    1    1    1    5  0.00000E+00 0.00000 
    6    1    1    1    1    1    1    1    1    6  0.00000E+00 0.00000 
    7    1    1    1    1    1    1    1    1    7  0.00000E+00 0.00000 
    8    1    1    1    1    1    1    1    1    8  0.00000E+00 0.00000 
    9    1    1    1    1    1    1    1    1    9  0.00000E+00 0.00000 
   10    1    1    1    1    1    1    1    1   10  0.00000E+00 0.00000 
   11    1    1    1    1    1    1    1    1   11  0.00000E+00 0.00000 
   12    1    1    1    1    1    1    1    1   12  0.00000E+00 0.00000 
   13    1    1    1    1    1    1    1    1   13  0.00000E+00 0.00000 
   14    1    1    1    1    1    1    1    1   14  3.42801E+13 0.21694 
   15    1    1    1    1    1    1    1    1   15  1.06771E+14 0.12669 
   16    1    1    1    1    1    1    1    1   16  2.17093E+14 0.10130 
   17    1    1    1    1    1    1    1    1   17  2.69274E+14 0.08323 
   18    1    1    1    1    1    1    1    1   18  4.25485E+14 0.06871 
   19    1    1    1    1    1    1    1    1   19  5.10307E+14 0.06000 
   20    1    1    1    1    1    1    1    1   20  6.45936E+14 0.05517 
   21    1    1    1    1    1    1    1    1   21  5.85695E+14 0.05700 
   22    1    1    1    1    1    1    1    1   22  4.69808E+14 0.06313 
   23    1    1    1    1    1    1    1    1   23  4.08765E+14 0.06682 
   24    1    1    1    1    1    1    1    1   24  3.32674E+14 0.07765 
   25    1    1    1    1    1    1    1    1   25  1.75047E+14 0.10176 
   26    1    1    1    1    1    1    1    1   26  9.76735E+13 0.13568 
   27    1    1    1    1    1    1    1    1   27  3.54566E+13 0.20604
                          ...
                          ...
                          ...                                                               
Regards.

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Jaakko Leppänen
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Re: Hexagonal mesh detector (dh)

Post by Jaakko Leppänen » Thu Apr 18, 2019 9:12 am

The values in the lattice detector output are in the same order as the entries in the lattice card.

The results are flux intergrals over energy, space (and time). In this case the integration volume is the single lattice cell.
- Jaakko

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