Boiling Water Reactor

Boiling Water Reactor

A boiling water reactor or BWR (the English boiling water reactor) is a type of nuclear reactor. It is the second most widely used type of reactor in nuclear power plants in the world. Approximately 22% of the nuclear reactors installed in the different nuclear power plants use the boiling water reactor.

The most important feature of the Boiling Water Reactor (BWR) is to use pressurized water as a moderator for neutrons and as a core refrigerant. Unlike the pressurized water reactor (PWR), there is no steam generator.

Operation of a Boiling Water Reactor (BWR)

The boiling water reactor uses a single light water cooling circuit (this is ordinary water, in nuclear power water engineering is called light water). Light water circulates through the reactor core, boils, and part of it turns into vapor.

The steam generated in the reactor core exits at the top and goes directly to the turbines. The steam leaving the reactor is treated by steam dryers and water separators before entering the turbines. The turbines will be in charge of running the electric generator and generating electricity.

The vapor then passes through a condenser to convert it to liquid water again and restart the cycle.

Characteristics of Boiling Water Reactor (BWR)

Use a single cooling circuit so that the steam moving the turbine is made up of water that has passed through the interior of the reactor. That is why the turbine building must be protected to prevent radioactive emissions.

On the other hand, the need for more space for the steam dryers and separators in the reactor vessel forces the control rods to enter the bottom of the reactor, whereby auxiliary energy is needed to raise and stop the reactor in case of emergency.

The nuclear fuel used by the reactor is enriched uranium oxides between 2% and 4%.

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Last review: June 20, 2017