Solving MCNP6 Burn Card Problem

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SUMMARY

The discussion centers on troubleshooting a fatal error encountered while using the MCNP6 code with burn cards. The user provided a sample input, which includes parameters such as BURN TIME, MAT, and various isotopic compositions. The error message indicates issues with memory reduction options and model requirements. Key advice includes verifying the units and magnitudes in the input, particularly the unusually large value of 1.0000E+36.

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Researchers, nuclear engineers, and simulation specialists working with MCNP6 who are troubleshooting burn card issues or optimizing input parameters for neutron transport simulations.

kslim
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Hello Every body,
I hope all is well.
I have a problem with MCNP6 code for using burn card, so please can anybody help me ?
---------------------------------------------------------------------------
particle maximum smallest largest always always
cutoff particle table table use table use model
particle type energy energy maximum maximum below above
1 n neutron 0.0000E+00 1.0000E+36 2.0000E+01 1.5000E+02 0.0000E+00 1.0000E+36

fatal error. Models required. Cannot use memory reduction option.
-----------------------------------------------------------------------------------------


i don't konw why that fatal error occurred.

I will give you my simple input.


-------------------------------------------------------------
Example
1 8 -15.973 -1 25 -27 imp:n=1 VOL=21.9982
2 0 #1 imp:n=0
1 cz 0.2837 $ Fuel(F)
25 pz -43.5 $ Lower Reflector(F)
27 pz 43.5 $ Inner Fuel(F), HT9 Follower(C)
BURN TIME = 120
MAT = 8
POWER = 1.0
PFRAC = 1.0
BOPT = 1.0 -24 1.0
m8 92234 3.0959E-05
92235 9.8822E-04
92236 6.0099E-05
92238 6.0904E-01
93237 5.5808E-03
94236 2.7995E-08
94238 2.7918E-03
94239 7.2628E-02
94240 3.3563E-02
94241 9.0784E-03
94242 6.7610E-03
95241 6.5719E-03
95242 1.7994E-04
95243 1.3456E-03
96242 2.2685E-04
96243 7.5349E-06
96244 3.3887E-04
96245 3.0141E-05
96246 2.0876E-06
40090 1.1575E-01
40091 2.5243E-02
40092 3.8584E-02
40094 3.9101E-02
40096 6.2994E-03
42000 2.5799E-02
nlib=66c $ Active Fuel Slug(Middle Core)
kcode 8000 1.0 30 130
ksrc 0 0 0
------------------------------------------------------------------
Regrads
 
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Make sure the units and magnitudes are correct.

What is 1.0000E+36? That seems like a large number.
 

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