The Bioreactor has been nerfed from Subnautica 1 and 1.5, both in power generation and lack of flora cultivation. The description for Strontium is that it’s good for radioactive applications so a nuclear reactor makes perfect sense in this situation. Ideally, it would be an internal facility that you could modulate the output of based on power needs. The higher the output the quicker it would go through the Strontium, not as a binary (Normal/Overdrive) like the Bioreactor, but a moveable slider comparable to what you see in the Axum reactor space.

I upvote that, but it could be nice to have the two types of nuclear reactors, I mean it could be nice to have a Fission Reactor that need “high maintenance” and a Fusion Reactor that need less maintenance but way harder to build

Not to sound like a smartass but you can cultivate plants in the game at this stage. the bioreactor won`t be an issue to use in that case. but ye still low output.