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Engineering
Nuclear Engineering
Troubleshooting MCNP k_eff for Space Reactor Core: Tips and Tricks"
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[QUOTE="Alex A, post: 6847212, member: 690804"] You've written 1:4.392 molar ratio UO2 to C. That seems about right. The next line though, you've gone 0.31 U235 ... 4.392 C. Something went wrong. I agree with the density. The void cell should be everything that isn't an active cell and it should completely surround the experiment. You have no limits in z (your core does, your experiment doesn't), which I don't like but for now MCNP seems happy. [code] 99 0 2:-500:501 imp:n=0 [/code] Usually it's the union of all areas that are no part of the problem and the outside. Your experiment is a slice of cake shape where the straight edges reflect - this produces a simulation of a complete reactor core with symmetry. So your void cell is the union of everything the wrong side of 500, everything the wrong side of 501 and everything outside of 2. In your lattice example you tried -9:-7:-5:-3:-1:501, -9 is inside macro body surface 9. -7 is inside macro body surface 7. You can't easily fix this, the use of macro bodies placed inside the core is going to make defining the missing volume complicated. My thoughts are to make a universe of cooling tube surrounded by core rod material, specify those in a hexagonal lattice which does the hexagonal cookie cutting, then surrounded by a cylinder. Your core then has the right shape, the cylinder isn't cutting into the actual rods, and volumes like the void become easy to define and it can be easily extended to cases with rods of mixed lower enrichment. [/QUOTE]
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Troubleshooting MCNP k_eff for Space Reactor Core: Tips and Tricks"
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