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Encyclopedia > Pebble bed modular reactor

Pebble Bed Modular Reactor (Pty) Ltd
Type Engineering
Founded 1994
Headquarters Centurion, Gauteng, South Africa
Area served South Africa, International
Key people CEO: Jaco Kriek
Industry Nuclear
Services Design, Project Management and Related Services
Employees Est. 900
Website http://www.pbmr.com

The pebble bed modular reactor or PBMR is a particular design of pebble bed reactor under development by South African company PBMR (Pty) Ltd since 1994, in partnership with Eskom and other companies. Image File history File links No higher resolution available. ... This article is about a term used in economics. ... This article is about work. ... A website (alternatively, Web site or web site) is a collection of Web pages, images, videos or other digital assets that is hosted on one or several Web server(s), usually accessible via the Internet, cell phone or a LAN. A Web page is a document, typically written in HTML... Graphite Pebble for Reactor The pebble bed reactor (PBR) or pebble bed modular reactor (PBMR) is an advanced nuclear reactor design. ... Eskom is a South African electricity public utility company. ...


The PBMR is fueled and moderated by fuel spheres each containing TRISO coated oxide fuel grains and a surrounding hollow sphere of graphite moderator. These are stacked in a close packed lattice and cooled by helium, which is used to drive a turbine directly, or may be used to provide process heat for the production of hydrogen fuel. This does not cite any references or sources. ... Nuclear fuel is any material that can be consumed to derive nuclear energy, by analogy to chemical fuel that is burned to derive energy. ... Fig. ...


The PBMR is modular in that only small to mid-sized units will be designed; Larger power stations will be built by combining many of these modules. As of 2007 400MWt was emerging as an optimum module size, considerably larger than the original concept size. 2007 is a common year starting on Monday of the Gregorian calendar. ...


The concept is based on THTR in Germany, but modified to drive a Brayton cycle turbine. The core is annular with a centre column as a neutron reflector. Operating fuel temperature is to be kept below 1130°C, to minimise fission product release from the fuel during operation. The control rods operate outside the fuel cavity, rather than in the spaces between the spheres, to simplify the geometry and management of the sphere lattice. The THTR-300 was a thorium high-temperature nuclear reactor rated at 300 MW electric (THTR-300). ... The Brayton cycle is a constant-pressure cycle named after George Brayton (1830–1892), the American engineer who developed it. ... Nuclear weapon designs are often divided into two classes, based on the dominant source of the nuclear weapons energy. ... Fission products are the residues of fission processes. ... A control rod is a rod made of a chemical element capable of absorbing many neutrons without decaying themselves. ...


The core is designed so that passive cooling is adequate to keep the fuel within its safe temperature range during shutdown. No secondary containment is considered necessary. A containment building, in its most common usage, is a steel or concrete structure enclosing a nuclear reactor. ...


Construction of a prototype single-unit demonstration reactor at Koeberg is scheduled to start in 2009, with fuel loading in 2013 with fuel supplied by a pilot fuel plant to be built at Pelindaba. The first commercial units could start construction in 2016. Koeberg is located 30 km north of Cape Town, on the West coast of South Africa, next to the SA Police Training College and the suburb of Melkbosstrand. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...


External links


  Results from FactBites:
 
Pebble bed reactor - Wikipedia, the free encyclopedia (4292 words)
In particular, most of the fuel containment resides in the pebbles, and the pebbles are designed so that a containment failure releases at most a 0.5 mm sphere of radioactive material.
Proponents claim that some kinds of pebble-bed reactors should be able to use thorium, plutonium and natural unenriched uranium, as well as the customary enriched uranium.
The pebbles are constructed of ceramics that are known not to melt at the maximum equilibrium temperature of the reactor.
  More results at FactBites »

 

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