How do I power a pump with a Reactor
Solution 1:
Yes. A Big Reactors reactor produces Redstone Flux (RF). Redstone Flux is converted to Buildcraft power automatically within most energy conduits.
Redstone Flux is a common power system that a lot of mods use. Your reactor should be able to power pretty much anything except for machines from IndustrialCraft2 (and given the right setup, you can convert RF to EU).