The pressurized water reactor (PWR) is a type of nuclear reactor used to the generate electricity and propel nuclear submarines and naval vessels. They make  ‎Characteristics · ‎Fuel · ‎Coolant and Moderator · ‎Pressure, Temperatures. Jump to Pressurised water reactor (PWR) - The design of PWRs originated as a submarine power plant. PWRs use ordinary water as both coolant  ‎Components of a nuclear · ‎Fuelling a nuclear power · ‎Advanced reactors. Pressurized water reactors (PWRs) constitute the large majority of the world's nuclear power plants and are one of three types of light water reactor (LWR), the  ‎Light-water reactor · ‎Boiling water reactor · ‎Supercritical water reactor.


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Pressurized water reactor

A fluid circulating through the core so as to transfer the heat from it. In light water reactors the water moderator functions also as primary coolant.

Except pwr nuclear reactor BWRs, there is secondary coolant circuit where the water becomes steam. See also later section on primary coolant characteristics.

Advantages of Pressurized Water Reactors (PWR)

Pressure vessel or pressure tubes. Essentially a heat exchanger like a motor car radiator.


Since over PWR reactors have had their steam generators replaced after years service, 57 of these in USA. The heat, but not the water, from the primary coolant is transferred to the secondary, system which then, turns into steam. The primary and secondary systems are closed systems.

This means the water flowing through the reactor remains separate and does not mix pwr nuclear reactor water from the other systems. The steam is pumped from the containment pwr nuclear reactor into the turbine building to push the giant blades of the turbine.

NRC: The Pressurized Water Reactor (PWR)

Approximately one third of the core is replaced each refueling, though some more modern refueling schemes may reduce refuel time to a few days and allow refueling to occur on a shorter periodicity.

Boron and control rods are used to maintain primary system temperature pwr nuclear reactor the desired point. In order to decrease power, the operator throttles shut turbine inlet valves.


This would result in less steam being drawn from the steam generators. This results in the primary loop increasing in temperature.

NRC: Pressurized Water Reactors

The higher temperature causes the density of the primary reactor coolant water to decrease, allowing higher neutron speeds, thus less fission and decreased power output. This decrease of power will eventually result in primary system temperature returning to its previous steady-state value. Boron readily absorbs neutrons and increasing or decreasing its concentration in the reactor coolant will therefore affect the neutron activity correspondingly.

An entire control system involving high pressure pumps usually called the charging and letdown system is required to pwr nuclear reactor water from the high pressure primary loop and re-inject the water back in with differing concentrations of boric acid.

Advantages of Pressurized Water Reactors (PWR)

The reactor's core contains fuel assemblies that are cooled by water circulated using electrically powered pumps.

These pumps and other operating systems in the plant receive their power from the electrical grid. Throughout pwr nuclear reactor time, MHI has consistently worked on improving the design and quality of its products, pwr nuclear reactor are now considered the highest in the world.

The leftover water from the main condenser is recycled back to the stem generator.

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