I think it is acceptably safe, others may differ. In the US there are 104 operating reactors none of which have caused any serious problems for the environment or population of the country. I think that is a pretty good record, but the industry needs always to be alert to keeping up high standards of design, maintenance, and operation.
People use the chemical uranium to help power electricity and power plants.
Uranium. Most current power reactors use Uranium enriched to 3% Uranium-235.
uranium
That is the main use, to fuel nuclear power plants
Uranium fuel.
Predominantly enriched uranium, but some reactors can use natural uranium.
The majority of commercial nuclear power reactors use uranium (natural or enriched) as nuclear fuel.
Uranium
A nuclear power plant does use uranium as fuel It "burns" it in the nuclear sense not the chemical sense
Uranium has stored energy (potential energy), more specifically, nuclear energy.
Nuclear power. Military use.
Yes, uranium is the most important nuclear fuel now.