By Eric Limer. It is the type of reaction that powers a hydrogen bomb. Fusion reactor, also called fusion power plant or thermonuclear reactor, a device to produce electrical power from the energy released in a nuclear fusion reaction. In fission, a heavy nucleus is split into smaller nuclei. The power that fuels the sun and the stars is nuclear fusion. Nuclear Fusion. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart. Nuclear fusion is the process of making a single heavy nucleus (part of an atom) from two lighter nuclei.This process is called a nuclear reaction.It releases a large amount of energy.. Nuclear fusion is essentially the opposite of nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. The fusion process is the reaction that powers the sun. Nuclear fusion and nuclear fission are different types of reactions that release energy due to the presence of high-powered atomic bonds between particles found within a nucleus. In fission, an atom is split into two or more smaller, lighter atoms. Everything You Should Know About Nuclear Fusion, Explained in Six Minutes. Since the 1930s, scientists have known that the Sun and other stars generate their energy by nuclear fusion. The researchers claimed that heat – which could only be explained in terms of nuclear processes – was produced, as well as fusion byproducts, including helium, tritium and neutrons. Nuclear fusion, which generates energy by fusing atoms together (similar to how the Sun works), is recognized as a safe and affordable way to access potentially limitless energy. Nuclear fusion can pro­vide a safe, clean energy source for future generations with several advantages over current fission reactors: Abundant fuel supply - Deuterium can be readily extracted from seawater, and excess tritium can be made in the fusion reactor itself … The most important reaction within the core of the Sun is the process called the "proton-proton cycle." With fusion, lighter nuclei are fused into a heavier nucleus. The use of nuclear fusion reactions for electricity generation remains theoretical. Uranium is the fuel most widely used by nuclear plants for nuclear fission. Fusion, in contrast, occurs when two or more smaller atoms fuse together, creating a larger, heavier atom. Fusion Milestone. In the core, pressures and temperatures are high enough to force fusion, that is, nuclear reactions whereby some nuclei merge to make others. Nuclear fuel—uranium . This fusion releases 17.6 MeV of energy. The nucleus made by fusion is heavier than either of the starting nuclei. 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