I want to write a post involving the basic equations for a reactor. First I'll create all the equations here probably. Interested in using these for the 2-fluid LFTR.
$$\dot{Q} = \dot{m} \Delta T C_p$$
That is the total power coming from the reactor. What are the limitations? A fluid core reactor has the unique distinction that the heat production rate doesn't matter at all. Instead, only absolute temperature matters, or exit temperature here.
$$T_{out}$$
For the 2-fluid LFTR, the surface flux of the fissile fluid is a limitation due to material limits of the separator between the two fluids. Additionally, the leakage has to be greater than the total fission absorption in order to have break-even breeding.
$$\dot{Q} \propto \Phi SA$$
The flow rate has other correlations.
$$\dot{m} = \rho V A$$
$$\dot{Q} = \rho V A \Delta T C_p$$
Otherwise, $V$ is limited, $\Delta T$ is limited, $C_p$ is already set by the fluid and is high for the salts in question, as well as $\rho$.
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