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 sectionSKF 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.