[brandmeyer]

They are extremely expensive in LCOE terms.

Their core life relies on highly enriched uranium. Production and delivery at commercial power scale is a weapons proliferation risk in addition to being more expensive.

Refueling a naval reactor is a multi-year operation that happens only a tiny handful of times in the life of the ship. Current-gen submarines don't get refueled at all. They can get away with this in large part because they aren't running at 100% power. They are shut down in port, and even at sea they only operate at low power most of the time.

To reduce LCOE, commercial power reactors run at full power all the time. Refueling a commercial power reactor takes a month or so and happens every 1.5 years.