[Feature] Development of the 0D Flow Model

[LukeSeifert]

Is your feature request related to a problem? Please describe.

The 0D scaled model is limited. This new model enables:

• Residence time analysis
• Chemical removal accuracy
• Improved concentration calculation
• Non-equilibrium concentrations

Describe the feature you'd like.

• All datasets listed in preliminary document are available
• OpenMC is used to generate concentrations during irradiation of the sample
• Multi-run enables combined least-squares solves between different irradiation sim results
• Chemical removal is tested
• Delayed neutron energy spectra are modeled

Additional context.

Tests must ensure that the capabilities are working.

How can this issue be closed?

All of the features associated with the 0D flow model are added.

• After completing these features, there should be sufficient data to publish a paper (PCCs, uncertainty-weighted PCCs, various datasets, detailed methodology, discussion of MoSDeN(?))