No, the only by-product of fusion reactions are small amounts of helium. Helium is an inert gas which can be safely released without harming the environment.

Deuterium can be extracted from water. Tritium will be produced inside the fusion power station via lithium transmutation. Lithium is an element abundant in the earth’s crust and seawater. These combined fuel supplies would last for many thousands of years at current rates of energy consumption. Once the next-generation fusion reactor can utilize advanced fuels such as protons and borons, the availability of fusion fuels is essentially unlimited.

One kilogram of fusion fuel could provide the same amount of energy as 10 million kilograms of fossil fuel.
A 1 Gigawatt fusion power station will need less than one tonne of fuel during a year’s operation.

Yes, it is designed to produce a continuous supply of large quatities of baseload electricity. Initially, the levelized costs of electricity from a fusion power plant are predicted to be similar to other sources but can be reduced significantly over time.

No radioactive waste by-product is produced from the fusion reaction itself. Neutrons from D-T fusion reactions can activate materials used in fusion reactors and will produce mostly short-lived radioactive wastes. As such, it does not pose the kind of long-term problem that Fission by-products create.

A large-scale nuclear accident is not possible in a fusion reactor. This is because the fusion reactor is a driven system using external actuators such as beam and rf wave heating. When the plasma condition in the reactor deviates from its desired operating condition, the fusion efficiency decreases rapidly within a fraction of milliseconds. Combined with a small quantity of fuel in a fusion device (about the weight of a postage stamp at any time), there are no risks of a runaway chain reaction.