Dear @paulromano , Thank you for pointing me to the useful information.
From paper “Application of FLUKA and OpenMC in coupled physics calculation of target and subcritical reactor for ADS”, in section 3.2 the keff value from MCNPX was compared with the keff value from Openmc which was obtained by fix-source calculation (refer from paper). I’m not sure that the keff mentioned in the paper represents one of these options? As far as I understand, maybe it is the “k-effective value would reproduce the actual observed multiplication factor (which depends on the external source)” right? Could you give me some idea how to get the keff value same as the paper present?
As I know maybe I was mistaken, kf and kq are still not automatically calculated in fix source mode.
Please correct me if I was wrong in any point.
Thank you very much for your time and kindly explanation,
thanapong