CANDU Reactors | Skill-Lync

Boiling water and pressurized water reactors come under the category of light-water reactors. That means these reactors use normal water as both coolant and moderator. Alternatively, if we use heavy water, then the absorption of neutrons by the water molecules will be less and more neutrons will be available for fission. The nuclear reactors that use heavy water as a coolant and moderator are called pressurized heavy water reactors. CANDU reactors are a type of pressurized heavy water reactors. They were first developed in Canada, use heavy water or deuterium as moderator and uranium as fuel, hence the name CANDU reactors.

A Canada deuterium uranium reactor has two loops, primary and secondary. A steam generator extracts and transfers the heat from the primary cooling loop to the secondary cooling loop. In the secondary cooling loop, light water is used to generate steam and power the turbine which in turn drives an electric generator.

The fuel in the reactor is arranged in a vessel called “Calandria”. Calandria consists of an assembly of fuel bundles in the form of metal tubes. CANDU reactors can be operated without any expensive uranium enrichment facilities and the fuel replacement can be done without shutting off the reaction in the core.

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