no chain specified, either manually or under depletion_chain in environment variable OPENMC_CROSS_SECTIONS

Dear All,

Does anyone know what happened with this and what should i do?

Thx,
Auliyah

You are not specifying depletion chain file for transmutation of nuclides. Add following line…

chain_file = ‘./chain_simple.xml’
op = openmc.deplete.Operator(geometry, settings, chain_file)

You can download depletion chain file from https://press3.mcs.anl.gov/openmc/depletion-chains/

Best regards
Pranto