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Nuclear Engineering
Troubleshooting MCNP k_eff for Space Reactor Core: Tips and Tricks"
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[QUOTE="Alex A, post: 6847883, member: 690804"] Firstly I was wrong that your experiment is not limited in z, surface 2 is a macro body and it does do this. Do watch out if you ever need to add a reflector! Almost all the information I can find on OPUS comes from "The challenges of gas-cooled reactor technology for space propulsion and the development of the JANUS space reactor concept" by Aiden Peakman and Robert Gregg. I can't find copies of the Raepsaet and Pascal, or Lokhov papers that are the primary sources for the information on the core. The core diagram we do have contains a measurement of 24cm, and I question why it isn't 21cm (3x7) or there isn't an extra layer of rods around, and I can't make the number of fuel rods add up. The 235 rods, which is the design the diagram seems to indicate, without reflector ought to be subcritical and it isn't (keff=1.07). So I made a few tweaks to the input file. I kept the segment design. I flipped surface 501 around so it aligned with lattice numbering better. I'm using my rough numbers for material values which may be very rough and lastly I may have made any number of mistakes. Major edit - I did make mistakes, I messed up the rod count on the version I uploaded by a lot. I think it's right now. [/QUOTE]
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Troubleshooting MCNP k_eff for Space Reactor Core: Tips and Tricks"
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