1. May 19, 2016 #1

   gte116r

   

   Under what conditions would negative buckling (B^2) be possible?

    

   gte116r, May 19, 2016
2. 
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3. May 20, 2016 #2

   QuantumPion

   

   Science Advisor

   Gold Member

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

    

   QuantumPion, May 20, 2016
4. May 20, 2016 #3

   Nidum

   

   Science Advisor

   Gold Member

   https://forums.autodesk.com/t5/robo...icients-in-buckling-analysis/m-p/3128634#M573

    

   Nidum, May 20, 2016
5. May 21, 2016 #4

   Astronuc

   

   Staff: Mentor

   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 = (νΣ_f - Σ_a)/D = (k_∞ - 1)/L², then the buckling is negative if k_∞ < 1, or Σ_a > νΣ_f.
   
   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

   Astronuc, May 21, 2016

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