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Environment & Energy

John ONeill

(74 posts)

3. Lead

Reply to NNadir (Reply #2)

Thu May 8, 2025, 12:21 AM

May 8

True, but the scattering and absorption cross-section table lists helium as being 0.00014% helium 3, with a cross-section of 5333 barns. Guess that won't last long in a reactor ! Think the Russian paper was mainly talking about having a much wider fuel rod lattice, for reduced pumping effort, plus easier neutron management.

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NNadir

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Highlight:

Norway and Sweden to Cooperate on Development of Lead Cooled Small Nuclear Reactors. [View all] NNadir May 5 OP

Lead John ONeill May 6 #1

4He has a capture cross section of zero, as isotopes with mass numbers 5 (and 8) do not exist. The scattering... NNadir May 7 #2

Lead John ONeill May 8 #3

I'm not sure whence that 5333 barn figure comes. The ENDF 7.1 scattering plot for 3He suggests a lower figure. NNadir May 8 #4