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Hey @katyhuff,

This is also built on #5. I've added a decent amount of content and made some comments based on both your comments and content. Let's iterate on this PR as you see fit; I'm happy to change the language as needed.
Perhaps "Simple, once-through fuel cycles can be generated with Cycamore and Cyclus alone. However, to represent more detailed process physics than is offered within Cycamore, additional models can be contributed."