Serpent
set title "Godiva"
%------define the sphere's surface----
surf 1 sph 0 0 0 8.7407
%------define cells--------------------
cell 1 0 uranium -1
cell 2 0 outside 1
%-------material definition--------------
% enriched uranium, at 300 K
mat uranium -18.74 %18.74 g/cm^3
92235.03c -.9473
92238.03c -.0527
92234.03c -.0102
%-------criticality calculation settings---------
set pop 1000 110 10 %1000 neutrons, 110 cycles, 10 of them inactive
%-------Set the xs library locations-------------
%use the file made with the xsdirconvert.pl script
%set acelib "/set/this/to/the/new/serpent/formatted/xs/directory/file"
MCNP
c Godiva is a critical bare sphere of uranium
1 1 -18.74 -1 imp:n=1 $ enriched uranium sphere (godiva)
2 0 1 imp:n=0 $ all space outside the sphere
1 so 8.7407 $ radius of the godiva sphere
c skip 10 and run a total of 110 keff cycles with 1000 neutrons per cycle
kcode 1000 1.0 10 110 $ kcode defines a criticality calculation
ksrc 0 0 0 $ initial keff spatial dist is point at origin
m1 92235 -93.71 92238 -5.27 92234 -1.02 $ define u with weight fractions
print $ more useful information in the output file
KENO VI
=csas6
godiva_keno6
ce_v7_endf
read composition
u 1 den=18.74 1 300
92234 1.0202
92235 93.7112
92238 5.2686 end
end composition
read parameter
htm=yes
end parameter
read geometry
global unit 1
com="Godiva Sphere"
sphere 1 8.741
media 1 1 1
boundary 1
end geometry
end data
end
