3D BWR assembly transient example

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Note: For transient simulations, the initial system needs to be as close to criticality as possible. The exact multiplication factor of the system may vary if different cross section libraries is used. In that case, adjust the boron content in the cool and moder materials to achieve criticality.

Generating the steady state source distributions

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

set title "Peach Bottom 2 from UAM, source generation "

include pins

include geometry

include materials

% --- Reflective boundary condition in XY:

set bc 2 2 1

% --- Neutron population and criticality cycles:

set pop 80000 1000000 200 1.0 100

% --- Geometry plots:

plot 3 1000 1000 0.0 
plot 3 1000 1000 0.0 -7.62 7.62 -7.62 7.62
plot 2 500 1500

% --- Total power for normalization:

set power 4.0000e+06

% --- Save source to "./source"-files

set savesrc "./source" 1.00 0.25 1 1 1

% --- Do not generate group constants

set gcu -1

% --- Do not use implicit capture, nxn, or fission

set impl 0 0 0

Time dependent simulation (no reactivity insertion)

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

set title "Peach Bottom 2 from UAM, time dependent simulation"

include pins

include geometry

include materials

% --- Reflective boundary condition in XY:

set bc 2 2 1

% --- Increase size of precursor buffer

set pbuf 10

% --- Total power for normalization:

set power 4.0000e+06

% --- Set up time structures for simulation and detectors:

%     1 time interval for simulation (no population control)

tme simutime 2 1 0 1 % 

%     20 time bins for detector

tme dettime 2 20 0 1

% --- Neutron population:

set nps 200000000 40000 simutime

% --- Output after each 10 cycles

set outp 10

% --- Link source (use point-wise precursor tracking)

set dynsrc "./source" 1

% --- Set up detectors
% --- Neutron population as a function of time

det 1 dr -15 void di dettime

% --- Fission energy deposition as a function of time

det 2 dr -8 void di dettime

% --- Do not generate group constants

set gcu -1

% --- Do not use implicit capture, nxn, or fission

set impl 0 0 0

Additional files

pins

% --- Empty lattice position:

pin 99
cool   

% --- Fuel pins 

pin 1
fuel4  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 2
fuel3  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 3
fuel3  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 4
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 5
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 6
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 7
fuel3  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 8
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 9
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 10
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 11
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 12
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 13
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 14
fuel5  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 15
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 16
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 17
fuel5  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 18
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 19
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 20
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 21
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 22
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 23
fuel5  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 24
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 25
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 26
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 27
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 28
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

geometry

% --- Assembly lattice definition

lat 100 1  0.23876  0.23876 9 9 1.875
99 99 99 99 99 99 99 99 99
99  1  2  3  4  5  6  7 99
99  2  8  9 10 11 12 13 99
99  3  9 14 15 16 17 18 99
99  4 10 15 19 20 21 22 99
99  5 11 16 20 23 24 25 99
99  6 12 17 21 24 26 27 99
99  7 13 18 22 25 27 28 99
99 99 99 99 99 99 99 99 99 


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

surf  1  sqc   0.23876  0.23876      6.70306 % *
surf  2  sqc   0.23876  0.23876  6.90626

surf  4  pz -182.88 % Active stack length 365.76 cm
surf  5  pz  182.88 % Active stack length 365.76 cm

surf  9  cuboid  -7.62 7.62 -7.62 7.62 -250.0 250.0


% --- Cell definitions:

cell  3  101  fill 100  -1          % Pin lattice
cell  4  101  box        1          % Channel box wall

cell  5  0  fill 101   -2 4 -5      % assembly inside channel box outer wall
cell  6  0  moder       2 4 -5 -9   % Water outside channel box
cell  9  0  moder        -4    -9   % bottom reflector
cell 10  0  moder            5 -9   % top reflector

cell 99  0  outside             9   % Outside world

materials

% --- Fuel materials:

% Fuel1 2.93 wt % enrichment
mat fuel1   -10.42 rgb 100 0 0 
92235.09c   -0.0258279
92238.09c   -0.85567041
8016.09c    -0.11850169

% Fuel2 1.94 wt % enrichment
mat fuel2   -10.42 rgb 160 0 0 
92235.09c   -0.01710132
92238.09c   -0.86441006
8016.09c    -0.11848862

% Fuel3 1.69 wt % enrichment
mat fuel3   -10.42 rgb 200 75 75 
92235.09c   -0.0148976
92238.09c   -0.86661708
8016.09c    -0.11848532

% Fuel4 1.33 wt % enrichment
mat fuel4   -10.42 rgb 255 150 150 
92235.09c   -0.01172421
92238.09c   -0.86979522
8016.09c    -0.11848057

% --- Fuel with Gd:

% Fuel5 2.93 wt % enrichment, 3.0 wt% Gadcontent
mat fuel5   -10.25 rgb 0 100 0 
92235.09c   -0.02505306
92238.09c   -0.8300003
8016.09c    -0.11891791
64152.09c   -0.00005029
64154.09c   -0.00055541
64155.09c   -0.00379519
64156.09c   -0.00528302
64157.09c   -0.004065
64158.09c   -0.00649317
64160.09c   -0.00578667

% --- Zirc2 and channel box wall:
% --- "Zircaloy-2" [PNNL-15870, Rev. 1]

mat Zirc2 -6.56000E+00 rgb 200 200 200 %*OK
 8016.06c  -1.19376E-03
 8017.06c  -4.83282E-07
24050.06c  -4.16117E-05
24052.06c  -8.34483E-04
24053.06c  -9.64457E-05
24054.06c  -2.44600E-05
26054.06c  -5.62862E-05
26056.06c  -9.16258E-04
26057.06c  -2.15389E-05
26058.06c  -2.91667E-06
28058.06c  -3.35317E-04
28060.06c  -1.33612E-04
28061.06c  -5.90496E-06
28062.06c  -1.91358E-05
28064.06c  -5.03067E-06
40090.06c  -4.98111E-01
40091.06c  -1.09835E-01
40092.06c  -1.69731E-01
40094.06c  -1.75753E-01
40096.06c  -2.89183E-02
50112.06c  -1.27668E-04
50114.06c  -8.84175E-05
50115.06c  -4.59485E-05
50116.06c  -1.98205E-03
50117.06c  -1.05596E-03
50118.06c  -3.35857E-03
50119.06c  -1.20129E-03
50120.06c  -4.59450E-03
50122.06c  -6.63830E-04
50124.06c  -8.43778E-04

% Assembly box treated as zircaloy
mat box      -6.56000E+00 tmp 557.0 rgb 200 200 200
 8016.03c  -1.19376E-03
 8017.03c  -4.83282E-07
24050.03c  -4.16117E-05
24052.03c  -8.34483E-04
24053.03c  -9.64457E-05
24054.03c  -2.44600E-05
26054.03c  -5.62862E-05
26056.03c  -9.16258E-04
26057.03c  -2.15389E-05
26058.03c  -2.91667E-06
28058.03c  -3.35317E-04
28060.03c  -1.33612E-04
28061.03c  -5.90496E-06
28062.03c  -1.91358E-05
28064.03c  -5.03067E-06
40090.03c  -4.98111E-01
40091.03c  -1.09835E-01
40092.03c  -1.69731E-01
40094.03c  -1.75753E-01
40096.03c  -2.89183E-02
50112.03c  -1.27668E-04
50114.03c  -8.84175E-05
50115.03c  -4.59485E-05
50116.03c  -1.98205E-03
50117.03c  -1.05596E-03
50118.03c  -3.35857E-03
50119.03c  -1.20129E-03
50120.03c  -4.59450E-03
50122.03c  -6.63830E-04
50124.03c  -8.43778E-04

% --- "Steel, Stainless 304" [PNNL-15870, Rev. 1]

mat ssteel -8.00000E+00 tmp 557.0 rgb 100 100 100 
 6012.03c  -3.95366E-04
14028.03c  -4.59332E-03
14029.03c  -2.41681E-04
14030.03c  -1.64994E-04
15031.03c  -2.30000E-04
16032.03c  -1.42073E-04
16033.03c  -1.15681E-06
16034.03c  -6.75336E-06
16036.03c  -1.68255E-08
24050.03c  -7.93000E-03
24052.03c  -1.59029E-01
24053.03c  -1.83798E-02
24054.03c  -4.66139E-03
25055.03c  -1.00000E-02
26054.03c  -3.96166E-02
26056.03c  -6.44901E-01
26057.03c  -1.51600E-02
26058.03c  -2.05287E-03
28058.03c  -6.21579E-02
28060.03c  -2.47678E-02
28061.03c  -1.09461E-03
28062.03c  -3.54721E-03
28064.03c  -9.32539E-04

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

mat cool     -0.46072  moder lwtr 1001 tmp 557 rgb 150 150 255 
 1001.03c     0.66667
 8016.03c     0.33333
 5010.03c     0.0000575

% --- Moderator:

mat moder    -0.46072  moder lwtr 1001 tmp 557 rgb 50 50 255 
 1001.03c     0.666667
 8016.03c     0.333333
 5010.03c     0.0000575 

% --- Thermal scattering data for light water:

%(HinH20 at 573.60K)
therm lwtr lwj3.11t