I encountered the error “Abort called from KASNEU reason LEXPLC && LFSSSC” during a FLUKA deep penetration simulation of a PWR. This crash specifically occurs when Point-wise transport is enabled alongside both fission reactions and DPA scoring via USRBIN, even though the fission-heavy core and the DPA scoring zones are spatially disjoint. Since the simulation runs successfully if I either disable DPA scoring or revert to multi-group mode, I am seeking advice on why fission reactions in a non-scoring region trigger this conflict with the Point-wise DPA algorithm and how to resolve it.
For troubleshooting purposes, I have created a simplified model. It retains the core settings (Point-wise mode and spatially separated fission/DPA zones) but simplifies the geometry to quickly reproduce the error.
Thanks for reporting. This was indeed a bug affecting DPA scoring when pointwise fission events occur. It will be fixed in the next release (scheduled in the following weeks).
