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((multiple issues|((More citations needed|date=November 2015))
((More footnotes|date=November 2015))))
((short description|Type of nuclear reactor cooled by a gas))
[[File:Gas-Cooled Fast Reactor Schemata.svg|right|upright=1.5|thumb|Gas-cooled fast reactor scheme]]

The '''gas-cooled fast reactor''' ('''GFR''') system is a nuclear reactor design which is currently in development. Classed as a [[Generation IV reactor]], it features a [[fast neutron reactor|fast-neutron spectrum]] and closed [[Nuclear fuel cycle|fuel cycle]] for efficient conversion of [[Fertile material|fertile uranium]] and management of [[actinide]]s. The reference reactor design is a [[helium]]-[[nuclear reactor coolant|cooled]] system operating with an outlet temperature of ((convert|850|C)) using a direct [[Brayton cycle|Brayton]] [[closed-cycle gas turbine]] for high thermal efficiency. Several fuel forms are being considered for their potential to operate at very high temperatures and to ensure an excellent retention of [[fission product]]s: composite [[ceramic]] fuel, advanced fuel particles, or ceramic clad elements of actinide compounds. Core configurations are being considered based on pin- or plate-based fuel assemblies or prismatic blocks, which allows for better coolant circulation than traditional fuel assemblies.

The reactors are intended for use in [[nuclear power plant]]s to produce electricity, while at the same time producing (breeding) new nuclear fuel.

== Reactor design ==

Fast reactors were originally designed to be primarily [[breeder reactor]]s. This was because of a view at the time of their conception that there was an imminent shortage of uranium fuel for existing reactors. The projected increase in uranium price did not materialize, but if uranium demand increases in the future, then there may be renewed interest in [[fast reactor]]s.

The GFR base design is a fast reactor, but in other ways similar to a [[high temperature gas-cooled reactor]]. It differs from the HTGR design in that the core has a higher fissile fuel content as well as a non-fissile, fertile, breeding component. There is no [[neutron moderator]], as the chain reaction is sustained by fast neutrons. Due to the higher fissile fuel content, the design has a higher power density than the HTGR.

== Fuel ==

In a GFR reactor design, the unit operates on fast neutrons; no moderator is needed to slow neutrons down. This means that, apart from nuclear fuel such as uranium, other fuels can be used. The most common is thorium, which absorbs a fast neutron and decays into Uranium 233. This means GFR designs have breeding properties—they can use fuel that is unsuitable in light water reactor designs and breed fuel. Because of these properties, once the initial loading of fuel has been applied into the reactor, the unit can go years without needing fuel. If these reactors are used for breeding, it is economical to remove the fuel and separate the generated fuel for future use.

== Coolant ==

The gas used can be many different types, including carbon dioxide or helium. It must be composed of elements with low [[neutron capture]] [[Neutron cross-section|cross section]]s to prevent positive [[void coefficient]] and [[induced radioactivity]]. The use of gas also removes the possibility of [[phase transition]]–induced explosions, such as when the water in a water-cooled reactor ([[pressurized water reactor|PWR]] or [[boiling water reactor|BWR]]) flashes to steam upon overheating or depressurization.  The use of gas also allows for higher operating temperatures than are possible with other coolants, increasing [[thermal efficiency]], and allowing other non-mechanical applications of the energy, such as the [[production of hydrogen]] fuel.

== Research history ==

Past pilot and demonstration projects have all used thermal designs with graphite moderators.  As such, no true gas-cooled fast reactor design has ever been brought to criticality.  The main challenges that have yet to be overcome are in-vessel structural materials, both in-core and out-of-core, that will have to withstand fast-neutron damage and high temperatures (up to ((convert|1600|C|disp=sqbr))).  Another problem is the low thermal inertia and poor heat removal capability at low helium pressures, although these issues are shared with thermal reactors which have been constructed. [[Peter Fortescue]], whilst at General Atomic, was leader of the team responsible for the initial development of the [[High temperature gas-cooled reactor]] (HTGR), as well as the Gas-cooled Fast Reactor (GCFR) system.<ref>((cite web |title=Peter Fortescue Dies at 102|url=http://www.ga.com/peter-fortescue-dies-at-102|first=Doug|last=Fouquet|via=General Atomics|access-date=20 November 2021))</ref>

Gas-cooled projects (thermal spectrum) include decommissioned reactors such as the [[Dragon reactor]], built and operated in the [[United Kingdom]], the AVR and the [[THTR-300]], built and operated in [[Germany]], and [[Peach Bottom Nuclear Generating Station|Peach Bottom]] and [[Fort St. Vrain Generating Station|Fort St. Vrain]], built and operated in the [[United States]]. Ongoing demonstrations include the [[High-temperature engineering test reactor]] in [[Japan]], which reached full power (30 MWth) using fuel compacts inserted in prismatic blocks in 1999, and the [[HTR-10]] in [[China]], which reached its full effect at 10 MWth in 2003 using pebble fuel. A 400 MWth [[pebble bed modular reactor]] demonstration plant was designed by PBMR Pty for deployment in [[South Africa]] but withdrawn in 2010, and a consortium of [[Russia]]n institutes is designing a 600 MWth [[GT-MHR]] (prismatic block reactor) in cooperation with [[General Atomics]]. In 2010, General Atomics announced the [[Energy Multiplier Module]] reactor design, an advanced version of the [[GT-MHR]]. 

A European gas cooled fast reactor (GFR) demonstrator, ALLEGRO, is currently being developed by Czech Republic, France, Hungary, Slovakia and Poland. The primary aim of ALLEGRO is to create a conceptual design of a helium-cooled fast reactor with passive [[decay heat]] removal during LOCA accidents based on nitrogen injections into the [[Containment building|guard vessel]] containing the [[reactor pressure vessel]] and to design an air-tight guard vessel capable of withstanding the increased pressure (over 10 bar) and temperature during the LOCA accident.<ref>((cite journal |last1=Kvizda |first1=Boris |title=ALLEGRO Gas-cooled Fast Reactor (GFR) demonstrator thermal hydraulic benchmark
 |url=https://www.sciencedirect.com/science/article/pii/S0029549318310033 |journal=Nuclear Engineering and Design |year=2019 |volume=345 |pages=47–61 |doi=10.1016/j.nucengdes.2019.02.006 |s2cid=116688540 |access-date=June 11, 2022))</ref>

== See also ==
* [[Energy Multiplier Module]]
* [[Fast breeder reactor]]
* [[Fast neutron reactor]]
* [[Generation IV reactor]]
* [[PBMR]]
* [[Very high temperature reactor]]
* [[HTR-10]]
* [[HTR-PM]]

== References ==
((Reflist))
* ((cite web|url=http://www.inl.gov/research/gas-cooled-fast-reactor/|publisher = Idaho National Laboratory|title = Gas-Cooled Fast Reactor (GFR) Fact Sheet))
* ((cite journal |doi = 10.1155/2009/965757|title = Gas-Cooled Fast Reactor: A Historical Overview and Future Outlook|journal = Science and Technology of Nuclear Installations|volume = 2009|pages = 1–11|year = 2009|last1 = Van Rooijen|first1 = W. F. G.|doi-access = free))

==External links==
* [https://web.archive.org/web/20050416133150/http://www.iaea.org/inis/aws/fnss/abstracts/abst_0154.html IAEA Fast Reactors and Accelerator Driven Systems Knowledge Base]
* [https://www.webharvest.gov/peth04/20041015130840/http://neri.inel.gov/universities_workshop/proceedings/pdfs/gfr.pdf INL GFR workshop summary]

((Nuclear fission reactors))

[[Category:Nuclear power reactor types]]
[[Category:Fast-neutron reactors]]

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