Could a nuclear battery (RTG) be simulated by MCNP5?

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SUMMARY

The discussion centers on the feasibility of simulating a nuclear battery, specifically a radioisotope thermoelectric generator (RTG) using plutonium-238, with MCNP5. While MCNP5 is capable of modeling neutron and gamma transport, it is not suitable for simulating radioactive decay processes. For calculating thermal sources from Pu-238, hand calculations based on its mass, half-life, and energy release per decay are recommended. For temperature distribution analysis, a finite-element code designed for heat transfer is necessary.

PREREQUISITES
  • Understanding of MCNP5 for neutron and gamma transport modeling
  • Knowledge of radioactive decay principles, specifically regarding plutonium-238
  • Familiarity with thermal calculations and energy deposition (F6 tally)
  • Experience with finite-element analysis for heat transfer simulations
NEXT STEPS
  • Research the use of MCNP5 for modeling neutron and gamma transport
  • Study the principles of radioactive decay and energy release in plutonium-238
  • Learn how to perform thermal calculations for radioactive sources
  • Explore finite-element codes for heat transfer analysis in thermal systems
USEFUL FOR

Nuclear engineers, researchers in nuclear energy, and professionals involved in thermal management of radioisotope systems will benefit from this discussion.

Al-mutawakel
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I am a graduate nuclear engineer(no Master yet), and I ask if nuclear battery(radioisotope thermoelectric generator, that use plutonium-238 as heat source) can be simulate by MCNP5. And is their any card in MCNP5 treat or deal with thermoelectric converions. Thanks
 
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Hi
I think it must be possible, because you can calculate the energy deposition (F6 tally)
 
thanks for replied.
 
What are you trying to model exactly? MCNP is used to model the transport of neutrons and gamma's, but it isn't the right tool to model radioactive decay.

Are you trying to calculate the thermal source? If so, it is a fairly easy hand calculation, you just need to know the the mass of Pu-238, the half-life, and the amount of energy released per decay. You might also have to include the decay of any daughter products from the decay of Pu-238.

If you want to actually calculate a temperature distribution, you would probably need to use a finite-element code that performed heat transfer. You would enter the heat source (calculated by the decay of Pu-238), and then the code could calculate the temperatures of the surrounding medium, including the thermal couples.
 

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