Uranium 235
The nuclear reaction used in the Bataan power plant is nuclear fission.
In a nuclear power plant
There is no nuclear power involved in a microwave unless the electricity used to power it is from a nuclear power plant.
Sodium is used as a coolant in kalpakkam nuclear power plant for Prototype Fast Breeder Reactor.
In bombs and nuclear power plants
Uranium is used as nuclear fuel.
Uranium
Most commonly used material to produce nuclear energy in Uranium.
Uranium-235
Nuclear fission has been used in nuclear bombs and is currently being used in every nuclear power plant on the earth.
Uranium is the fuel that is used.