Yeah that's GP's point by the 'only'. It's 'waste' as in a byproduct.
It's part of the reason fusion's so sought after - it doesn't result in anything bad or that has to be carefully sequestered.
(Apart from extraordinary heat I suppose. Perhaps there's an argument the actual reactor would always be a pretty risky place. But any incident isolated at least, worst case a remote industrial building burns down beyond economical repair.)
The temperature is high but the amount of heat is no different than other thermal power plants. The atoms move very fast, but there aren't many of them.
It's part of the reason fusion's so sought after - it doesn't result in anything bad or that has to be carefully sequestered.
(Apart from extraordinary heat I suppose. Perhaps there's an argument the actual reactor would always be a pretty risky place. But any incident isolated at least, worst case a remote industrial building burns down beyond economical repair.)