What is the meaning of 'kappa' in Parcs cross-section input files?

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SUMMARY

The term 'kappa' in Parcs cross-section input files refers to the Kappa-fission cross section (SKF), which is associated with the local power density in BWR-transient calculations. This is distinct from the Nu-fission cross section (SNF), which pertains to neutrons per fission event multiplied by the fission cross section. Understanding kappa is crucial for accurate modeling in Parcs, especially when converting cross-sections from PSG2/Serpent simulations.

PREREQUISITES
  • Familiarity with BWR-transient calculations
  • Understanding of cross-section terminology in nuclear physics
  • Experience with Parcs simulation software
  • Knowledge of PSG2 and Serpent simulation tools
NEXT STEPS
  • Research the definition and application of Kappa-fission cross section in nuclear simulations
  • Explore the Parcs documentation for cross-section input file specifications
  • Study the relationship between local power density and fission cross sections
  • Review the thesis linked in the discussion for detailed insights on kappa
USEFUL FOR

Nuclear engineers, researchers in reactor physics, and simulation specialists working with Parcs and related nuclear simulation tools will benefit from this discussion.

SebastianF
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Background:
For a BWR-transient calculation I'm trying to convert cross-sections I got from PSG2/Serpent simulations in Parcs [CrossSection] Input files.

My Question:
Parcs makes use of
SNF Nu-fission cross section​
SKF Kappa-fission cross section​

I assume this means Nu (as in neutrons/fission-event times fission cross section) but I'm not familiar with kappa in this context. Anyone have an idea what it denotes?

P.S.
Any and all documentation or insights about parcs cross-section input files would be more than welcome.
 
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There is a definition of kappa-fission in this thesis.
http://www.lib.ncsu.edu/theses/available/etd-03012005-134843/unrestricted/etd.pdf

Just search on kappa (see page 27/127 of the pdf, or page 17, eq. 4.2d), where kappa is related to the local power density.
 
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