A runaway fusion reaction is a hypothetical scenario in which a fusion reaction becomes self-sustaining and uncontrollable, leading to a massive release of energy. This is a major safety concern for nuclear fusion reactors, as it could potentially cause a catastrophic explosion.

Control rods are used in nuclear fission reactors to control the rate of the nuclear reaction. They are not typically used in nuclear fusion reactors, as the fusion reaction is self-sustaining and cannot be controlled in the same way.

Neutron shielding is used in nuclear fusion reactors to protect the reactor components from damage caused by the high-energy neutrons produced during the fusion reaction. These neutrons can cause the materials in the reactor to become radioactive and degrade over time, leading to safety concerns.

Nuclear fusion has the potential to generate clean energy without producing greenhouse gases or radioactive waste. This makes it an attractive option for addressing climate change and reducing our reliance on fossil fuels.

The primary challenge in developing a commercially viable nuclear fusion reactor is the difficulty in achieving and maintaining the extreme conditions necessary for fusion to occur. This includes high temperatures, high pressures, and strong magnetic fields.

Tritium is a radioactive isotope of hydrogen that is used in some nuclear fusion reactions. It is a concern for safety because it can be released into the environment during reactor operation or accidents, posing a health risk to humans and the environment.

A tokamak reactor is a type of nuclear fusion reactor that is used to study the behavior of plasma. It is not designed to generate electricity or produce radioactive waste, but rather to provide insights into the physics of fusion reactions.

Lithium is a metal that is used in some nuclear fusion reactions. It is a concern for safety because it can become radioactive when exposed to neutrons, posing a health risk to humans and the environment.

The International Thermonuclear Experimental Reactor (ITER) is a large-scale nuclear fusion research project that aims to study the behavior of plasma and demonstrate the feasibility of fusion energy. It is not designed to generate electricity or produce radioactive waste.

Beryllium is a metal that is used in some nuclear fusion reactors. It is a concern for safety because it can become radioactive when exposed to neutrons, posing a health risk to humans and the environment.

A stellarator reactor is a type of nuclear fusion reactor that is used to study the behavior of plasma. It is not designed to generate electricity or produce radioactive waste, but rather to provide insights into the physics of fusion reactions.

Tungsten is a metal that is used in some nuclear fusion reactors. It is a concern for safety because it can become radioactive when exposed to neutrons, posing a health risk to humans and the environment.

A divertor is a component in a nuclear fusion reactor that is used to remove impurities from the plasma. This is important for preventing the buildup of impurities that can interfere with the fusion reaction and damage the reactor components.

Helium is a gas that is used in some nuclear fusion reactions. It is a concern for safety because it can become radioactive when exposed to neutrons, posing a health risk to humans and the environment.

A blanket is a component in a nuclear fusion reactor that is used to convert the energy of neutrons into heat. This heat is then used to generate electricity.