During the setup process of the fixed neutron source in the PWR core, I hope to turn off the secondary fission neutrons in the core simulation. When I intend to use the user routine to turn off the secondary fission neutrons in the core, I can only find the secondary neutron identifier kpart related to hadron events. Could you please tell me if there is a symbol that can accurately identify the fission secondary neutrons and inform me of its source?
Any guidance or reference to the relevant manual sections would be highly appreciated.
Dear Yingming,
You can first filter by the FLUKA ID of the incident particle using the variable JTRACK, which for neutrons is 8. Then, if you want to restrict your analysis to incident particles of the first generation, you can further filter using the variable LTRACK (equal to 1 for the first generation).
Best,
Davide
My apologies, my previous answer was not fully complete.
In addition to the above, one should also inspect the logical flag LFSSSC (in the common trackr.inc): this flag is used for inelastic interactions ending with fission (also for low energy neutrons).