As a matter of fact.
Hyperion Power Generation
Their reactors are about 2 meters tall and about 1.5 meters across. They weigh around 15 to 20 tons and produce around 30 MW or power. This design is also way over engineered to counter any irrational fears about radiation and tampering. I'm sure a 10 ton unit putting out 50MW and with adequate shielding would be well within reach.