UNGG reactor

UNGG reactor

The UNGG ("Uranium Naturel Graphite Gaz") is an obsolete design of nuclear power reactor developed by France. It was graphite moderated, cooled by carbon dioxide, and fueled with natural uranium metal.

It was developed independently of and in parallel to the British Magnox design, and to meet similar requirements. The main difference between the two designs is the fuel cladding material, which was magnesium-zirconium alloy in the UNGG, as opposed to magnesium-aluminium in the Magnox reactor. Both claddings react with water, making short-term reprocessing of the fuel essential, and requiring heavily shielded facilities for this.

The UNGG and the Magnox are the two main types of GCR. A UNGG reactor is often referred to simply as a "GCR" in English documents, or sometimes loosely as a "Magnox".

The first generation of French nuclear power stations were UNGGs, as was Vandellos unit 1 in Spain. Of ten units built, all are now shut down.

Units

* G1, G2 and G3 at Marcoule. G1 was the first UNGG to go critical, in 1956.
* Chinon Nuclear Power Plant A1, A2, and A3 in Indre-et-Loire.
* Saint-Laurent Nuclear Power Plant A1 and A2 in Loir-et-Cher.
* Bugey Nuclear Power Plant 1 in Ain, the last UNGG built in France, first criticality 1972.
* Vandellòs Nuclear Power Plant 1 in Spain, the only UNGG built outside of France.

The earlier units, at Chinon and Marcoule, had heat exchangers outside the main pressure vessel; Later units (Saint-Laurent, Bugeye and Vandellos) moved these heat exchangers to inside the pressure vessel.

ee also

* Gas cooled reactor.
* Nuclear power in France

External links

* [http://fr.wikipedia.org/wiki/UNGG UNGG] on the french part of Wikipedia (in French).
* [http://www.iaea.org/inis/aws/htgr/abstracts/abst_28008789.html French activities on gas cooled reactors] , D Bastien, IAEA-TECDOC--899, pp:51-53, 30 Oct - 2 Nov 1995
* [http://www.iaea.org/inis/aws/htgr/abstracts/abst_iwggcr19_16.html Twenty-nine years of French experience in operating gas-cooled reactors] , D Bastien, IWGGCR--19, pp:113-119 21-23 Sep 1988


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • UNGG — Este artículo o sección sobre tecnología necesita ser wikificado con un formato acorde a las convenciones de estilo. Por favor, edítalo para que las cumpla. Mientras tanto, no elimines este aviso puesto el 28 de agosto de 2008. También puedes… …   Wikipedia Español

  • Reactor refrigerado por gas — Un reactor refrigerado por gas o GCR (su acrónimo en inglés, Gas Cooled Reactor) fue un reactor nuclear que utilizaba grafito como moderador de neutrones y dióxido de carbono como refrigerante. Aunque existen otros tipos de reactores refrigerados …   Wikipedia Español

  • Gas Cooled Reactor — A Gas Cooled Reactor (more commonly called a GCR) is a generation I nuclear reactor that uses graphite as a neutron moderator and carbon dioxide as coolant. Although there are many other types of reactor cooled by gas, the terms GCR and to a… …   Wikipedia

  • Gas cooled reactor types — Articles on Gas cooled reactor types include:* Advanced gas cooled reactor * Gas cooled fast reactor * Gas Cooled Reactor * Gas turbine modular helium reactor * High temperature gas cooled reactor * Magnox * Pebble bed modular reactor * Pebble… …   Wikipedia

  • Advanced Gas-cooled Reactor — Réacteur avancé au gaz Pour les articles homonymes, voir AGR. Schéma d un AGR. Les réacteurs avancés au gaz ou AGR (Advanced Gas cooled Reactor …   Wikipédia en Français

  • Golfech Nuclear Power Plant — Infobox NPP Picture = Golfech NPP cropped.jpg Pic des = Nuclear power station Golfech Country = France Utility = Electricité de France Built = 1982 Start = February 1, 1991 End = Reactor = 2 S Reactor = Reactor MW = 2,726 El Prod = 17,992 for… …   Wikipedia

  • Nuclear power in France — …   Wikipedia

  • Saint-Laurent Nuclear Power Plant — Infobox NPP Picture = Saint laurent nouan.jpg Pic des = Sunflowers and the nuclear power station Saint Laurent Country = France Utility = EDF Built = 1963 Start = March 24, 1969 End = Reactor = 2 S Reactor = 2 Reactor MW = 1.912 El Prod = 12.918… …   Wikipedia

  • Liste des réacteurs nucléaires en France — Carte des centrales françaises en activité, classées selon leur type La France dispose en 2011 de 58 réacteurs nucléaires en activité dans 19 centrales nucléaires de production d électricité. 12 réacteurs nucléaires sont arrêtés,… …   Wikipédia en Français

  • Liste der Kernkraftwerke — Civaux – Kernkraftwerk mit den leistungsstärksten Reaktorblöcken der Welt Diese Liste der Kernkraftwerke enthält alle Kernkraftwerke weltweit, welche zur kommerziellen Gewinnung elektrischer Energie genutzt werden. Es werden nicht nur die aktuell …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”