Here's the most basic info on fusion safety I could find: https://www.iaea.org/bulletin/safety-in-fusion

The conditions required to start and maintain a fusion reaction make a fission-type accident or nuclear meltdown based on a chain reaction impossible. Nuclear fusion power plants will require out-of-this-world conditions — temperatures exceeding 100 million degrees Celsius to achieve high enough particle density for the reaction to take place. As fusion reactions can only take place under such extreme conditions, a ‘runaway’ chain reaction is impossible

“Fusion is a self-limiting process: if you cannot control the reaction, the machine switches itself off,”

fusion does not produce highly radioactive, long lived nuclear waste.