Hi forum members. I need some guidance in the following question. In the Studsvik code Simulate-3 you can calculate differnetial and integral rod worths with the input card CRD.OCB. Further, you can specify if you want to lock hydraulics and fission products to some predefined state via the SAV.LOK card. While this being a highly un-physical calculation in the first place, what would be the most apropriate in your opinion, to use SAV.LOK or not to use SAV.LOK? If you would use SAV.LOK what would you lock? Arguments? I suppose the answer depends on what the result would be used for so let's say it's for a stone-age reactivity balance calculation. Thanks in advance.