Not all power reactors have a reactor vessel. Power reactors are generally classified by the type of coolant rather than the by the configuration of the reactor vessel used to contain the coolant. The classifications are:
Of the main classes of reactor with a pressure vessel, the PWR is unique in that the pressure vessel suffers significant neutron irradiation (called fluence) during operation, and may become brittle over time as a result. In particular, the larger pressure vessel of the BWR is better shielded from the neutron flux, so although more expensive to manufacture in the first place because of this extra size, it has an advantage in not needing annealing to extend its life.
Annealing of PWR reactor vessels to extend their working life is a complex and high-value technology being actively developed by both nuclear service providers (AREVA) and operators of PWRs.
Patent Application Titled "Nuclear Reactor Vessel Support Structure and Construction Method of Nuclear Reactor Vessel Support Structure" Published Online
Nov 07, 2013; By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington,...
US Patent Issued to L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude on Dec. 20 for "Coil Piping System for Reactor Vessel" (District Of Columbia, Virginia, Texas Inventors)
Dec 27, 2011; ALEXANDRIA, Va., Dec. 27 -- United States Patent no. 8,080,207, issued on Dec. 20, was assigned to L'Air Liquide Societe Anonyme...