2D PWR MOX/UOX lattice geometry

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% --- PWR MOX/UOX lattice (SCALE-style input format) ---------

% --- Problem title:

set title "MOX assembly in UOX lattice"

% --- Cross section library file path:

set acelib "sss_jeff311u.xsdata"

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

% --- Material definitions ("comp block"):

% --- UOX fuel, initial enrichment 3.25%, burnup 25 MWd/kgU:

mat UO2 6.585000E-02 92235.09c 3.0000E-04 92236.09c 8.0000E-05 92238.09c 2.0000E-02 93237.09c 7.1000E-06 94238.09c 1.7000E-06 94239.09c 1.2000E-04 94240.09c 3.8000E-05 94241.09c 2.1000E-05 94242.09c 5.3000E-06 95241.09c 4.2000E-07 54131.09c 1.4000E-05 54135.09c 8.0000E-09 63153.09c 2.8000E-06 62149.09c 9.0000E-08 45103.09c 1.8000E-05 60143.09c 2.5000E-05 55133.09c 3.5000E-05 64155.09c 8.4000E-10 43099.09c 3.2000E-05 42095.09c 3.2000E-05 61147.09c 6.4000E-06 62150.09c 7.5000E-06 62151.09c 4.1000E-07 62152.09c 3.2000E-06

8016.09c    4.5100E-02

% --- Low Pu-content (2.9%) MOX fuel:

mat MOX1 6.702700E-02 92234.09c 4.3391E-07 92235.09c 4.9682E-05 92236.09c 8.6782E-07 92238.09c 2.1644E-02 94238.09c 5.4861E-06 94239.09c 4.3144E-04 94240.09c 1.3387E-04 94241.09c 4.8185E-05 94242.09c 1.8859E-05 95241.09c 9.1090E-06

8016.09c    4.4685E-02

% --- Medium Pu-content (4.4%) MOX fuel:

mat MOX2 6.702100E-02 92234.09c 4.2718E-07 92235.09c 4.8271E-05 92236.09c 8.5435E-07 92238.09c 2.1309E-02 94238.09c 8.1476E-06 94239.09c 6.5555E-04 94240.09c 2.0151E-04 94241.09c 7.4065E-05 94242.09c 2.7751E-05 95241.09c 1.4626E-05

8016.09c    4.4681E-02

% --- High Pu-content (5.6%) MOX fuel:

mat MOX3 6.701800E-02 92234.09c 4.2175E-07 92235.09c 4.9766E-05 92236.09c 8.4350E-07 92238.09c 2.1037E-02 94238.09c 1.0815E-05 94239.09c 8.3501E-04 94240.09c 2.5798E-04 94241.09c 9.4430E-05 94242.09c 3.6112E-05 95241.09c 1.7374E-05

8016.09c    4.4678E-02

% --- Zircaloy in cladding and guide tube:

mat can 4.004642E-02 40000.06c 3.9550E-02 26000.06c 1.3830E-04 24000.06c 7.0720E-05

8016.06c    2.8740E-04

% --- Water with 550 ppm boron:

mat water 7.088200E-02 moder lwtr 1001

1001.06c    4.7240E-02
8016.06c    2.3620E-02
5010.06c    4.3210E-06
5011.06c    1.7390E-05

% --- Thermal scattering data for light water:

therm lwtr lwj3.11t

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

% --- Parameters ("param block"):

% --- Periodic boundary condition:

set bc 3

% --- Neutron population and criticality cycles:

set pop 2000 500 20

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

% --- Geometry ("geom block"):

% --- UOX Pin ("unit 1"):

pin 1 UO2 0.41260 can 0.47400 water

% --- Guide tube ("unit 2"):

pin 2 water 0.57100 can 0.61300 water

% --- MOX Pins ("units 3-5"):

pin 3 MOX1 0.41260 can 0.47400 water

pin 4 MOX2 0.41260 can 0.47400 water

pin 5 MOX3 0.41260 can 0.47400 water

% --- UOX-assembly ("unit 100"):

surf 1000 sqc 0.0 0.0 10.727

cell 100 100 fill 110 -1000 cell 101 100 water 1000

% --- MOX-assembly ("unit 200"):

surf 2000 sqc 0.0 0.0 10.727

cell 200 200 fill 210 -2000 cell 201 200 water 2000

% --- Core lattice ("global unit 0"):

surf 3000 sqc 0.0 0.0 21.612

cell 300 0 fill 300 -3000 cell 301 0 outside 3000

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

% --- Lattices ("array block"):

% --- UOX pin lattice:

lat 110 1 0.0 0.0 17 17 1.262

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

% --- MOX pin lattice:

lat 210 1 0.0 0.0 17 17 1.262

3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 4 4 4 4 2 4 4 2 4 4 2 4 4 4 4 3 3 4 4 2 4 5 5 5 5 5 5 5 4 2 4 4 3 3 4 4 4 5 5 5 5 5 5 5 5 5 4 4 4 3 3 4 2 5 5 2 5 5 2 5 5 2 5 5 2 4 3 3 4 4 5 5 5 5 5 5 5 5 5 5 5 4 4 3 3 4 4 5 5 5 5 5 5 5 5 5 5 5 4 4 3 3 4 2 5 5 2 5 5 2 5 5 2 5 5 2 4 3 3 4 4 5 5 5 5 5 5 5 5 5 5 5 4 4 3 3 4 4 5 5 5 5 5 5 5 5 5 5 5 4 4 3 3 4 2 5 5 2 5 5 2 5 5 2 5 5 2 4 3 3 4 4 4 5 5 5 5 5 5 5 5 5 4 4 4 3 3 4 4 2 4 5 5 5 5 5 5 5 4 2 4 4 3 3 4 4 4 4 2 4 4 2 4 4 2 4 4 4 4 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3

% --- Core lattice:

lat 300 1 0.0 0.0 3 3 21.612

100 100 100 100 200 100 100 100 100

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

% --- Plotters ("plot block"):

% --- Geometry and mesh plots:

plot 3 500 500 mesh 3 500 500

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