You may mean 'reactivity'. In a nuclear reactor, this is the measure of how much above or below criticality the reactor state is, which effectively determines how fast the neutron flux increases or decreases.
steel
If it is stored in the nucleus, it must be nuclear energy.
Yes, nuclear energy is energy.
iron
Nuclear energy
Nuclear fusion produces nuclear energy
The energy released is nuclear energy.
Uranium is used as nuclear fuel in nuclear reactors.
Nuclear energy and renewable energy are not related. Renewable energy does not use nuclear energy.
Nuclear energy is converted to electrical energy in a nuclear power plant.
What is the question
Are there any uses of Nuclear Energy? Are there any uses of Nuclear Energy?