FINIX PB2 CE example input
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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.
Contents
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
- ^ 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
