FINIX PB2 example input: Difference between revisions

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The input model is based on the Peach Bottom 2 BWR assembly from the UAM benchmark
The input model is based on the Peach Bottom 2 BWR assembly from the UAM benchmark
<ref>Ivanov et al. "''BENCHMARKS FOR UNCERTAINTY ANALYSIS IN MODELLING (UAM) FOR THE DESIGN, OPERATION AND SAFETY ANALYSIS OF LWRs, Volume I: Specification and Support Data for Neutronics Cases (Phase I), Version 2.1''", NEA/NSC/DOC(2013)7</ref> with the segmented absorber rod replaced by a full length one.
<ref>Ivanov et al. "''Benchmarks for Uncertainty Analysis in Modelling (UAM) for the Design, Operation and Safety Analysis of LWRs, Volume I: Specification and Support Data for Neutronics Cases (Phase I), Version 2.1''", NEA/NSC/DOC(2013)7</ref> with the segmented absorber rod replaced by a full length one. For simplicity the Serpent input has been divided into multiple files using the [[Input syntax manual#include (read another input file)|include]] card.


== Main Serpent input ==
== Main Serpent input ==


</references>
<nowiki>
% --- Asymmetric BWR assembly with Gd-pins -------------------
 
set title "Peach Bottom 2 from UAM, FINIX calculation"
 
% --- Remember to set TMS limits for materials
 
include materials
 
include pins
 
include geometry
 
% --- Reflective boundary condition in XY, black in Z:
 
set bc 2 2 1
 
% --- Link FINIX input files
 
set finrodfile      "./finixfiles/rod_library.txt"
set finoptionsfile  "./finixfiles/options_library.txt"
set finscenariofile "./finixfiles/scenario_library.txt"
 
% --- Define sub-pin-level power binning for FINIX
% Name bin1, 6 radial zones in pellet, 24 axial zones
 
finbin bin1 0.0 0.60579 6 -182.88 182.88 24
 
% --- Link finix solvers for each pin type
 
finrod 1 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 2 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 3 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 4 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 5 rod_pb2_yesgd options_pb2_all scenario_pb2_all bin1
 
% --- Neutron population and criticality cycles:
% --- This is simulated on each iteration
 
set pop 5000 10 100
 
% --- This is the number of iterations
 
set ccmaxiter 10
 
% --- Use a smaller number of inactive cycles after each FINIX solution
% --- (Fission source passing on, number of alternative cycles is 10)
 
set fsp 1 10
 
% --- Total power
 
set power 3.9429e+06
 
% --- Geometry and mesh plots:
 
plot 3 1000 1000 0.0
plot 3 1000 1000 0.0 -22.86 7.62 -22.86 7.62
plot 2 500 1500
plot 1 500 1500
 
% --- xy-plot of fission power / thermal flux
 
mesh 3 1000 1000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0
 
% --- xz-plot of fission power / thermal flux
 
mesh 2 1000 3000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0
 
% --- xy-plot of temperature distribution / thermal flux
 
mesh 10 3 1000 1000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0
 
% --- xz-plot of temperature distribution / thermal flux
 
mesh 10 2 1000 3000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0</nowiki>
 
== Additional Serpent files ==
 
=== ''materials'' file  ===
 
<nowiki>% --- Fuel materials, TMS limits 557 K and 2100 K:
 
% Fuel1 2.93 wt % enrichment
mat fuel1  -10.42 tft 557.0 2100.0 rgb 100 0 0
92235.03c  -0.0258279
92238.03c  -0.85567041
8016.03c    -0.11850169
 
% Fuel2 1.94 wt % enrichment
mat fuel2  -10.42 tft 557.0 2100.0 rgb 160 0 0
92235.03c  -0.01710132
92238.03c  -0.86441006
8016.03c    -0.11848862
 
% Fuel3 1.69 wt % enrichment
mat fuel3  -10.42 tft 557.0 2100.0 rgb 200 75 75
92235.03c  -0.0148976
92238.03c  -0.86661708
8016.03c    -0.11848532
 
% Fuel4 1.33 wt % enrichment
mat fuel4  -10.42 tft 557.0 2100.0 rgb 255 150 150
92235.03c  -0.01172421
92238.03c  -0.86979522
8016.03c    -0.11848057
 
% --- Fuel with Gd, TMS limits 557 K and 2100 K:
 
% Fuel5 2.93 wt % enrichment, 3.0 wt% Gadcontent
mat fuel5  -10.25 tft 557.0 2100.0 rgb 0 100 0
92235.03c  -0.02505306
92238.03c  -0.8300003
8016.03c    -0.11891791
64152.03c  -0.00005029
64154.03c  -0.00055541
64155.03c  -0.00379519
64156.03c  -0.00528302
64157.03c  -0.004065
64158.03c  -0.00649317
64160.03c  -0.00578667
 
% --- Zirc2 cladding, TMS limits 557 K and 1000 K:
 
mat Zirc2 -6.56000E+00 tft 557.0 1000.0 rgb 200 200 200
8016.03c  -1.19376E-03
24052.03c  -8.34483E-04
26056.03c  -9.16258E-04
28058.03c  -3.35317E-04
28060.03c  -1.33612E-04
28062.03c  -1.91358E-05
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
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
 
% --- Assembly box treated as zircaloy, composition is the same as
%    Zirc2, but has to be separate as the temperature is constant
 
mat box      -6.56000E+00 tmp 557.0 rgb 200 200 200
8016.03c  -1.19376E-03
24052.03c  -8.34483E-04
26056.03c  -9.16258E-04
28058.03c  -3.35317E-04
28060.03c  -1.33612E-04
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
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
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
 
% --- Moderator:
 
mat moder    -0.46072  moder lwtr 1001 tmp 557 rgb 50 50 255
1001.03c    0.666667
8016.03c    0.333333
 
% --- Thermal scattering data for light water:
 
% (HinH20 at 573.60K)
therm lwtr lwj3.11t </nowiki>
 
=== ''pins'' file ===
 
<nowiki>% --- Empty lattice position:
 
pin 99
cool 
 
% --- Fuel pins:
 
pin 1
fuel1  0.60579
void  0.62103
Zirc2  0.71501
cool
 
pin 2
fuel2  0.60579
void  0.62103
Zirc2  0.71501
cool
 
pin 3
fuel3  0.60579
void  0.62103
Zirc2  0.71501
cool
 
pin 4
fuel4  0.60579
void  0.62103
Zirc2  0.71501
cool
 
pin 5
fuel5  0.60579
void  0.62103
Zirc2  0.71501
cool</nowiki>
 
=== ''geometry'' file ===
 
<nowiki>lat 100 1  0.23876  0.23876 9 9 1.875 % *
99 99 99 99 99 99 99 99 99
99  4  3  3  2  2  2  3 99
99  3  2  1  1  1  1  2 99
99  3  1  5  1  1  5  1 99
99  2  1  1  1  1  1  2 99
99  2  1  1  1  5  1  1 99
99  2  1  5  1  1  1  2 99
99  3  2  1  1  1  2  2 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
 
% --- Axial limits of the active part
 
surf  4  pz -182.88 % Active stack length 365.76 cm
surf  5  pz  182.88 % Active stack length 365.76 cm
 
% --- Boundary of one assembly cell
 
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</nowiki>
 
== FINIX input files ==
 
=== ''rod_library.txt'' file ===
 
<nowiki>! Peach Bottom 2 BWR rod from UAM description
! No gadolinia
 
begin rod_pb2_nogd
 
pellet_inner_radius = 0.0           
pellet_outer_radius = 6.0579e-03     
clad_inner_radius = 6.2103e-03   
clad_outer_radius = 7.1501e-03   
fuel_axial_length = 3.6576
clad_axial_length = 3.6576
 
plenum_length = 0.4013             
 
pellet_roughness = 2.0e-6
fractional_density = 0.951
gadolinia_weight_fraction = 0.0
 
clad_roughness = 0.5e-6
coldwork = 0.5               
clad_oxygen_concentration = 0.0012     
fast_neutron_fluence = 0.0   
 
! Fill gas pressure (Pa)
fill_gas_pressure = 0.69e6
 
! As-fabricated fill-gas temperature
fill_gas_temperature = 300.0
 
! Fill gas fractions
gas_fraction_He = 1.0
gas_fraction_Ar = 0.0
gas_fraction_Kr = 0.0
gas_fraction_Xe = 0.0
gas_fraction_H2 = 0.0
gas_fraction_N2 = 0.0
gas_fraction_H2O = 0.0
 
! Rod pitch
pitch = 18.75e-3
 
! Number of rods in unit cell (1.0 in square, 0.5 in triangular lattice)
unitcell = 1.0
 
end rod_pb2_nogd
 
 
! Peach Bottom 2 BWR rod from UAM description
! 3.0 wt-% gadolinia
 
begin rod_pb2_yesgd
 
pellet_inner_radius = 0.0           
pellet_outer_radius = 6.0579e-03     
clad_inner_radius = 6.2103e-03   
clad_outer_radius = 7.1501e-03   
fuel_axial_length = 3.6576
clad_axial_length = 3.6576
 
plenum_length = 0.4013             
 
pellet_roughness = 2.0e-6
fractional_density = 0.951
gadolinia_weight_fraction = 0.03
 
clad_roughness = 0.5e-6
coldwork = 0.5               
clad_oxygen_concentration = 0.0012     
fast_neutron_fluence = 0.0   
 
! Fill gas pressure (Pa)
fill_gas_pressure = 0.69e6
 
! As-fabricated fill-gas temperature
fill_gas_temperature = 300.0
 
! Fill gas fractions
gas_fraction_He = 1.0
gas_fraction_Ar = 0.0
gas_fraction_Kr = 0.0
gas_fraction_Xe = 0.0
gas_fraction_H2 = 0.0
gas_fraction_N2 = 0.0
gas_fraction_H2O = 0.0
 
! Rod pitch
pitch = 18.75e-3
 
! Number of rods in unit cell (1.0 in square, 0.5 in triangular lattice)
unitcell = 1.0
 
end rod_pb2_yesgd</nowiki>
 
=== ''options_library.txt'' file ===
 
<nowiki>! Basic options for the Peach Bottom 2 simulation
 
begin options_pb2_all
 
! Number of nodes in the thermal/mechanical solution
 
axial_nodes = 24
pellet_radial_nodes = 51
clad_radial_nodes = 21
 
! Boundary condition is fixed cladding outer temperature
! NB: This must be given in the scenario
 
boundary_option = 0
 
end options_pb2_all</nowiki>
 
=== ''scenario_library.txt'' file ===
 
<nowiki>! Basic scenario for Peach Bottom 2 simulations using clad surface temperature
! as a boundary condition
 
begin scenario_pb2_all
 
! Clad temperature history
 
! Only one axial zone
clad_temperature_history_zones = 3.6576
 
! Temperature, time pairs for first axial zone
! Only one time point now
clad_temperature_history(1) = 570.0, 0.0
 
end scenario_pb2_all</nowiki>
 
== References ==
 
<references/>
 
[[Category:Example input files|FINIX]]

Latest revision as of 14:28, 29 November 2017

The input model is based on the Peach Bottom 2 BWR assembly from the UAM benchmark [1] with the segmented absorber rod replaced by a full length one. For simplicity the Serpent input has been divided into multiple files using the include card.

Main Serpent input

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

set title "Peach Bottom 2 from UAM, FINIX calculation"

% --- Remember to set TMS limits for materials

include materials

include pins

include geometry

% --- Reflective boundary condition in XY, black in Z:

set bc 2 2 1

% --- Link FINIX input files

set finrodfile      "./finixfiles/rod_library.txt"
set finoptionsfile  "./finixfiles/options_library.txt"
set finscenariofile "./finixfiles/scenario_library.txt"

% --- Define sub-pin-level power binning for FINIX
% Name bin1, 6 radial zones in pellet, 24 axial zones

finbin bin1 0.0 0.60579 6 -182.88 182.88 24

% --- Link finix solvers for each pin type

finrod 1 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 2 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 3 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 4 rod_pb2_nogd  options_pb2_all scenario_pb2_all bin1
finrod 5 rod_pb2_yesgd options_pb2_all scenario_pb2_all bin1

% --- Neutron population and criticality cycles:
% --- This is simulated on each iteration

set pop 5000 10 100

% --- This is the number of iterations

set ccmaxiter 10

% --- Use a smaller number of inactive cycles after each FINIX solution
% --- (Fission source passing on, number of alternative cycles is 10)

set fsp 1 10

% --- Total power

set power 3.9429e+06

% --- Geometry and mesh plots:

plot 3 1000 1000 0.0 
plot 3 1000 1000 0.0 -22.86 7.62 -22.86 7.62
plot 2 500 1500
plot 1 500 1500

% --- xy-plot of fission power / thermal flux

mesh 3 1000 1000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0

% --- xz-plot of fission power / thermal flux

mesh 2 1000 3000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0

% --- xy-plot of temperature distribution / thermal flux

mesh 10 3 1000 1000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0

% --- xz-plot of temperature distribution / thermal flux

mesh 10 2 1000 3000 0 -7.62 7.62 -7.62 7.62 -250.0 250.0

Additional Serpent files

materials file

% --- Fuel materials, TMS limits 557 K and 2100 K:

% Fuel1 2.93 wt % enrichment
mat fuel1   -10.42 tft 557.0 2100.0 rgb 100 0 0
92235.03c   -0.0258279
92238.03c   -0.85567041
8016.03c    -0.11850169

% Fuel2 1.94 wt % enrichment
mat fuel2   -10.42 tft 557.0 2100.0 rgb 160 0 0
92235.03c   -0.01710132
92238.03c   -0.86441006
8016.03c    -0.11848862

% Fuel3 1.69 wt % enrichment
mat fuel3   -10.42 tft 557.0 2100.0 rgb 200 75 75
92235.03c   -0.0148976
92238.03c   -0.86661708
8016.03c    -0.11848532

% Fuel4 1.33 wt % enrichment
mat fuel4   -10.42 tft 557.0 2100.0 rgb 255 150 150
92235.03c   -0.01172421
92238.03c   -0.86979522
8016.03c    -0.11848057

% --- Fuel with Gd, TMS limits 557 K and 2100 K:

% Fuel5 2.93 wt % enrichment, 3.0 wt% Gadcontent
mat fuel5   -10.25 tft 557.0 2100.0 rgb 0 100 0
92235.03c   -0.02505306
92238.03c   -0.8300003
8016.03c    -0.11891791
64152.03c   -0.00005029
64154.03c   -0.00055541
64155.03c   -0.00379519
64156.03c   -0.00528302
64157.03c   -0.004065
64158.03c   -0.00649317
64160.03c   -0.00578667

% --- Zirc2 cladding, TMS limits 557 K and 1000 K:

mat Zirc2 -6.56000E+00 tft 557.0 1000.0 rgb 200 200 200
 8016.03c  -1.19376E-03
24052.03c  -8.34483E-04
26056.03c  -9.16258E-04
28058.03c  -3.35317E-04
28060.03c  -1.33612E-04
28062.03c  -1.91358E-05
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
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

% --- Assembly box treated as zircaloy, composition is the same as
%     Zirc2, but has to be separate as the temperature is constant

mat box      -6.56000E+00 tmp 557.0 rgb 200 200 200
 8016.03c  -1.19376E-03
24052.03c  -8.34483E-04
26056.03c  -9.16258E-04
28058.03c  -3.35317E-04
28060.03c  -1.33612E-04
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
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
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

% --- Moderator:

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

% --- Thermal scattering data for light water:

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

pins file

% --- Empty lattice position:

pin 99
cool   

% --- Fuel pins:

pin 1
fuel1  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 2
fuel2  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 3
fuel3  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 4
fuel4  0.60579
void   0.62103
Zirc2  0.71501
cool

pin 5
fuel5  0.60579
void   0.62103
Zirc2  0.71501
cool

geometry file

lat 100 1  0.23876  0.23876 9 9 1.875 % *
99 99 99 99 99 99 99 99 99
99  4  3  3  2  2  2  3 99
99  3  2  1  1  1  1  2 99
99  3  1  5  1  1  5  1 99
99  2  1  1  1  1  1  2 99
99  2  1  1  1  5  1  1 99
99  2  1  5  1  1  1  2 99
99  3  2  1  1  1  2  2 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

% --- Axial limits of the active part

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

% --- Boundary of one assembly cell

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

FINIX input files

rod_library.txt file

! Peach Bottom 2 BWR rod from UAM description
! No gadolinia

begin rod_pb2_nogd

pellet_inner_radius = 0.0             
pellet_outer_radius = 6.0579e-03      
clad_inner_radius = 6.2103e-03    
clad_outer_radius = 7.1501e-03    
fuel_axial_length = 3.6576
clad_axial_length = 3.6576

plenum_length = 0.4013               

pellet_roughness = 2.0e-6
fractional_density = 0.951
gadolinia_weight_fraction = 0.0

clad_roughness = 0.5e-6
coldwork = 0.5                
clad_oxygen_concentration = 0.0012      
fast_neutron_fluence = 0.0    

! Fill gas pressure (Pa)
fill_gas_pressure = 0.69e6

! As-fabricated fill-gas temperature
fill_gas_temperature = 300.0

! Fill gas fractions
gas_fraction_He = 1.0
gas_fraction_Ar = 0.0
gas_fraction_Kr = 0.0
gas_fraction_Xe = 0.0
gas_fraction_H2 = 0.0
gas_fraction_N2 = 0.0
gas_fraction_H2O = 0.0

! Rod pitch
pitch = 18.75e-3

! Number of rods in unit cell (1.0 in square, 0.5 in triangular lattice)
unitcell = 1.0

end rod_pb2_nogd


! Peach Bottom 2 BWR rod from UAM description
! 3.0 wt-% gadolinia

begin rod_pb2_yesgd

pellet_inner_radius = 0.0             
pellet_outer_radius = 6.0579e-03      
clad_inner_radius = 6.2103e-03    
clad_outer_radius = 7.1501e-03    
fuel_axial_length = 3.6576
clad_axial_length = 3.6576

plenum_length = 0.4013               

pellet_roughness = 2.0e-6
fractional_density = 0.951
gadolinia_weight_fraction = 0.03

clad_roughness = 0.5e-6
coldwork = 0.5                
clad_oxygen_concentration = 0.0012      
fast_neutron_fluence = 0.0    

! Fill gas pressure (Pa)
fill_gas_pressure = 0.69e6

! As-fabricated fill-gas temperature
fill_gas_temperature = 300.0

! Fill gas fractions
gas_fraction_He = 1.0
gas_fraction_Ar = 0.0
gas_fraction_Kr = 0.0
gas_fraction_Xe = 0.0
gas_fraction_H2 = 0.0
gas_fraction_N2 = 0.0
gas_fraction_H2O = 0.0

! Rod pitch
pitch = 18.75e-3

! Number of rods in unit cell (1.0 in square, 0.5 in triangular lattice)
unitcell = 1.0

end rod_pb2_yesgd

options_library.txt file

! Basic options for the Peach Bottom 2 simulation

begin options_pb2_all

! Number of nodes in the thermal/mechanical solution

axial_nodes = 24
pellet_radial_nodes = 51
clad_radial_nodes = 21

! Boundary condition is fixed cladding outer temperature
! NB: This must be given in the scenario

boundary_option = 0

end options_pb2_all

scenario_library.txt file

! Basic scenario for Peach Bottom 2 simulations using clad surface temperature
! as a boundary condition

begin scenario_pb2_all

! Clad temperature history 

! Only one axial zone 
clad_temperature_history_zones = 3.6576

! Temperature, time pairs for first axial zone
! Only one time point now
clad_temperature_history(1) = 570.0, 0.0

end scenario_pb2_all

References

  1. ^ Ivanov et al. "Benchmarks for Uncertainty Analysis in Modelling (UAM) for the Design, Operation and Safety Analysis of LWRs, Volume I: Specification and Support Data for Neutronics Cases (Phase I), Version 2.1", NEA/NSC/DOC(2013)7
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