12 articles
Advanced gas-cooled reactor
The advanced gas-cooled reactor (AGR) is a British second-generation nuclear reactor developed from the Magnox design in the 1960s, using graphite moderation and carbon dioxide coolant.
Gas Turbine-Modular Helium Reactor
The Gas Turbine-Modular Helium Reactor (GT-MHR) is a helium-cooled high-temperature reactor design, developed by General Atomics and OKBM in Russia, that drives a gas turbine directly instead of producing steam.
High-temperature gas-cooled reactor
A high-temperature gas-cooled reactor (HTGR) is a graphite-moderated, helium-cooled nuclear reactor with ceramic-coated TRISO fuel, reaching coolant temperatures of 700–950 °C; China's HTR-PM became the first commercial-scale plant in 2023.
HTR-PM
The HTR-PM is a Chinese demonstration nuclear plant at Shidao Bay, Shandong, pairing two pebble-bed high-temperature gas-cooled reactors with one turbine; it reached commercial operation in 2023 as the world's first modular HTGR plant.
Magnox
Magnox was a class of first-generation British nuclear reactors, carbon dioxide-cooled and graphite-moderated, burning natural uranium in magnesium alloy cladding; Calder Hall, the first station, opened in 1956.
Modular Helium Reactor
The Modular Helium Reactor (MHR) is a small, passively safe high-temperature gas-cooled nuclear reactor using helium coolant, graphite, and coated-particle fuel, developed by General Atomics from designs including the MHTGR.
Next Generation Nuclear Plant
The Next Generation Nuclear Plant (NGNP) was a US Department of Energy project, created by the Energy Policy Act of 2005, to build a prototype high temperature gas-cooled reactor for hydrogen production.
Pebble-bed modular reactor
The Pebble-bed modular reactor was a South African high-temperature gas-cooled reactor design developed by Eskom's PBMR company, funded from the mid-1990s until 2010, and revived in 2025.
Pebble-bed reactor
A pebble-bed reactor is a high-temperature gas-cooled nuclear reactor in which fuel pebbles circulate through the core while helium carries heat away, allowing refueling without shutdown.
UNGG reactor
The UNGG reactor, short for uranium naturel graphite gaz, was a French gas-cooled power reactor design of the 1950s using natural uranium fuel and carbon dioxide coolant.
Very-high-temperature reactor
The very-high-temperature reactor (VHTR) is a Generation IV nuclear reactor design that is graphite-moderated and helium-cooled, delivering outlet temperatures of 700 to 950 °C for electricity and industrial heat.
Xe-100
The Xe-100 is a small modular pebble-bed high-temperature gas-cooled reactor developed by X-energy, designed to deliver 80 MWe or 200 MWt per module, with four-reactor plants delivering 320 MWe.