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Negative Buckling

  1. May 19, 2016 #1
    Under what conditions would negative buckling (B^2) be possible?
  2. jcsd
  3. May 20, 2016 #2


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    Never. Buckling is a function of physical parameters (sphere radius, reaction cross-sections, diffusion coefficient), none of which can ever be negative.
  4. May 20, 2016 #3


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  5. May 21, 2016 #4


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    Buckling of a structure (mechanical analysis) is not the same as 'buckling' with respect to the neutron flux in a nuclear reactor.

    I believe B2 < 0 implies the system is subscritical.

    Let B2 = (νΣf - Σa)/D = (k - 1)/L2, then the buckling is negative if k < 1, or Σa > νΣf.

    Ref: http://www.nuceng.ca/br_space/2015-..._flux_shape_in_various_reactor_geometries.pdf

    Geometric buckling would not be negative.
    Last edited: May 21, 2016
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