MCNP6 BURN -- Testing about burnable poison depletion

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SUMMARY

The discussion focuses on testing burnable poison depletion using MCNP6, specifically with gadolinium isotopes (64151 and 64159) and their impact on calculations. The user encountered a fatal error due to certain nuclides relying on physics models instead of data tables. To resolve this, they utilized the omit option to bypass problematic isotopes, allowing the simulation to run successfully. Suggestions included enabling advanced physics and checking decay products like Tb-151 and Eu-159, as well as considering the installation of ENDF-VIII for additional data on the isotopes.

PREREQUISITES
  • Familiarity with MCNP6 simulation software
  • Understanding of nuclear isotopes, particularly gadolinium isotopes
  • Knowledge of physics models versus data tables in nuclear simulations
  • Experience with advanced physics options in MCNP6
NEXT STEPS
  • Enable advanced physics in MCNP6 for improved accuracy
  • Research the decay products of gadolinium isotopes, specifically Tb-151 and Eu-159
  • Install ENDF-VIII and explore its data for gadolinium isotopes
  • Investigate the impact of capture cross sections on simulation results
USEFUL FOR

Nuclear engineers, researchers in nuclear physics, and anyone involved in MCNP6 simulations focusing on burnable poisons and isotope depletion.

goyu96
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Hello, I'm testing about burnable poison depletion with mcnp6.

I'm using
m1 92233.82c -7.91619E-01
90232.82c -8.75802E-02
8016.82c -1.20800E-01
for fuel

and
m12 64152.82c -1.39023E-03 $ gd-152
64154.82c -1.53529E-02 $ gd-154
64155.82c -2.39616E-01 $ gd-155
64156.82c -1.46035E-01 $ gd-156
64157.82c -2.56647E-01 $ gd-157
64158.82c -1.79482E-01 $ gd-158
64160.82c -1.59950E-01 $ gd-160
8016.82c -1.52669E-03 $ o-16
for burnable poison.
but this caused fatal error
-----
The following nuclides use physics models rather than data tables:

6014. c
7016. c
8018. c
9018. c
64151. c
64159. c
66157. c
66159. c
------
so I used omit option
omit= -1 8 6014 7016 8018 9018 64151 64159 66157 66159
Then It works, but, I want calculate gadolinia (64151, 64159)..
how can I do this?
 
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Have you tried turning the advanced physics on instead of using the omit line? You could check the decay products Tb-151 and Eu-159 are being produced.

It might be fine as it is. Unless the capture cross section is huge it might not affect the answer much.

Another option might be to install ENDF-VIII and see if it has data for those isotopes.