2D BWR fuel assembly geometry

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% --- Asymmetric BWR assembly with Gd-pins -------------------

set title "BWR+Gd"

% --- Fuel Pin definitions:

pin 1
fuel1  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 2
fuel2  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 3
fuel3  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 4
fuel4  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 5
fuel5  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 6
fuel6  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

pin 7
fuel7  4.33500E-01
void   4.42000E-01
clad   5.02500E-01
cool   

% --- Empty lattice position:

pin 9
cool   

% --- Lattice (type = 1, pin pitch = 1.295):

lat 10  1  0.0 0.0 12 12 1.295
9 9 9 9 9 9 9 9 9 9 9 9 
9 1 2 3 5 5 5 5 5 3 2 9
9 2 3 5 6 6 6 6 7 5 4 9
9 3 5 7 6 7 6 6 6 6 5 9
9 5 6 6 6 6 6 6 7 6 6 9
9 5 6 7 6 9 9 9 6 7 6 9
9 5 6 6 6 9 9 9 6 6 6 9
9 5 6 6 6 9 9 9 6 6 6 9
9 5 7 6 7 6 6 6 7 6 5 9
9 3 5 6 6 7 6 6 6 6 5 9
9 2 4 5 6 6 6 6 5 5 3 9
9 9 9 9 9 9 9 9 9 9 9 9

% --- Outer channel (assembly pitch = 15.375):

surf 1  sqc   0.0     0.0     6.70000
surf 2  sqc   0.0     0.0     6.93000
surf 3  sqc  -0.233  -0.233   7.68750

% --- Channel inside assembly:

surf 4  sqc   0.6475  0.6475  1.6742  
surf 5  sqc   0.6475  0.6475  1.7445

% --- Cell definitions:

cell  1  0  moder    -4     % Water inside moderator channel
cell  2  0  box       4 -5  % Moderator channel walls
cell  3  0  fill 10  -1  5  % Pin lattice
cell  4  0  box       1 -2  % Channel box wall
cell  5  0  moder     2 -3  % Water outside channel box
cell 99  0  outside   3     % Outside world

% --- Fuel materials:

mat fuel1   -10.424
 92235.09c   -0.015867
 92238.09c   -0.86563
  8016.09c   -0.1185

mat fuel2   -10.424
 92235.09c   -0.018512
 92238.09c   -0.86299
  8016.09c   -0.1185

mat fuel3   -10.424
 92235.09c   -0.022919
 92238.09c   -0.85858
  8016.09c   -0.1185

mat fuel4   -10.424
 92235.09c   -0.026445
 92238.09c   -0.85505
  8016.09c   -0.1185

mat fuel5   -10.424
 92235.09c   -0.029971
 92238.09c   -0.85153
  8016.09c   -0.1185

mat fuel6   -10.424
 92235.09c   -0.032615
 92238.09c   -0.84888
  8016.09c   -0.1185

% --- Fuel with Gd:

mat fuel7   -10.291  
 92235.09c   -3.13109E-02 
 92238.09c   -8.14929E-01 
 64152.09c   -6.70544E-05
 64154.09c   -7.13344E-04
 64155.09c   -5.06012E-03
 64156.09c   -7.08860E-03
 64157.09c   -5.43718E-03
 64158.09c   -8.64341E-03
 64160.09c   -7.69426E-03
  8016.09c   -1.19056E-01  

% --- Cladding and channel box wall:

mat clad     -6.55
 40000.06c   -0.98135
 24000.06c   -0.00100
 26000.06c   -0.00135
 28000.06c   -0.00055
 50000.06c   -0.01450
  8016.06c   -0.00125

mat box      -6.55
 40000.06c   -0.98135
 24000.06c   -0.00100
 26000.06c   -0.00135
 28000.06c   -0.00055
 50000.06c   -0.01450
  8016.06c   -0.00125

% --- Coolant (40% void fraction):

mat cool     -0.443760  moder lwtr 1001
 1001.06c     0.66667
 8016.06c     0.33333

% --- Moderator:

mat moder -0.739605  moder lwtr 1001
 1001.06c     0.666667
 8016.06c     0.333333

% --- Thermal scattering data for light water:

therm lwtr lwj3.11t

% --- Cross section data library file path:

set acelib "sss_jeff311u.xsdata"

% --- Reflective boundary condition:

set bc 2

% --- Neutron population and criticality cycles:

set pop 2000 500 20

% --- Geometry and mesh plots:

plot 3 500 500
mesh 3 500 500

% --- Total power for normalization:

set power 1.96329E+04  

% --- Detector energy grid (1 bin, E > 1.0 MeV):

ene 1 1 1.0 20

% --- Average fast flux in cladding:

det 1  
de 1        %  Use energy grid 1
dm clad     %  Score in material "clad"
dv 16.3361  %  Volume for normalization

% --- Pin-wise fast flux in cladding:

det 2
de 1        %  Use energy grid 1
dm clad     %  Score in material "clad"
dl 10       %  Lattice bins in lat 10
dv 0.17952  %  Volume for normalization

% --- Fast flux in inner moderator channel wall:

det 3
de 1        %  Use energy grid 1
dc 2        %  Score in cell 2
dv 0.96134  %  Volume for normalization

% --- Fast flux in outer channel wall:

det 4
de 1        %  Use energy grid 1
dc 4        %  Score in cell 4
dv 12.5396  %  Volume for normalization

% ------------------------------------------------------------