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BWRs are primarily found in the US, Japan, Sweden and Taiwan. The steam generated in the reactor is fed directly to the turbine. Unlike PWRs, this design has a single circuit in which water is held at a pressure that allows it to boil. Water in the secondary circuit is under less pressure and therefore boils, turning the turbine to generate electricity.īoiling water reactors (BWRs) are the second most common reactor type globally, making up approximately 15% of the global fleet. Water in the primary circuit is prevented from boiling by pressurising the reactors. The design is distinguished by having a primary cooling circuit which flows through the core of the reactor, and a secondary circuit in which steam is generated to drive the turbine. Pressurised water reactors (PWRs) make up almost 70% of the global reactor fleet. There are three major reactor design families under the umbrella of water-cooled reactors currently in use: There are two major types of water-cooled reactor: light water reactors (which use normal water) and heavy water reactors (which use a chemically distinct type of water). ![]() Three boiling water reactors (BWRs) at Oskarshamn Nuclear Power Plant, Sweden (Image: Uniper).Ībout 425 reactors globally, ranging in size from 30-1660MW, are water-cooled. Most use water to cool their cores, whilst others use gas or metals. Most are large enough to power major cities, and small reactors are being developed to complement them. Nuclear reactors come in many different shapes and sizes. ![]() Are there different types of nuclear reactor?
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