Godiva inputs

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