Energy_User replied to the thread Help.
Don't use Thermal Expansion with the Fluid Reactor. It will end badly (eventually, the coolant in the fluiducts will be voided)...
Full closed-loop automation of the reactor is available using the IC2 mod itself. Use the Fluid Distributor and Fluid Regulator as pipe sections.
https://wiki.industrial-craft.net/index.php?title=Fluid_reactor