Reaper will not run as a slave to anything, but you can easily send MIDI and audio back and forth between Renoise and Reaper using ReaRoute and loopMIDI, which should work on Windows 7 and later.
You can still send a clock to Renoise from Reaper, but you will not have timeline / song position synchronization or anything like that.
This setup basically turns Renoise into a separate tempo synced sampler / sequencer / groovebox while Reaper functions as a digital multi-track mixer and tape deck; however, your mileage may vary depending on what you’re trying to do.