SPARC's models show a net positive for tritium breeding of 1.08 (tritium produced/tritium consumed) but I'm pretty sure this relies on enriched lithium, althoug

SPARC's models show a net positive for tritium breeding of 1.08 (tritium produced/tritium consumed) but I'm pretty sure this relies on enriched lithium, although I can't find where they specify the level of enrichment for that model. I'm sure it was a design constraint though.