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A high-temperature gas-cooled reactor (HTGR) is a type of gas-cooled nuclear reactor which uses uranium fuel and graphite moderation to produce very high reactor core output temperatures. [1] All existing HTGR reactors use helium coolant. The reactor core can be either a "prismatic block" (reminiscent of a conventional reactor core) or a ...
The HTR-PM is a high-temperature gas-cooled (HTGR) pebble-bed reactor. While the German AVR and THTR-300, operating from 1969 to 1988, were the first pebble-bed reactors and operated at similar temperatures, the HTR-PM is the first such design using modular construction and the second small modular reactor, following Russia's Akademik Lomonosov floating plant in 2019.
The high-temperature engineering test reactor (HTTR) is a graphite-moderated gas-cooled research reactor in Ōarai, Ibaraki, Japan operated by the Japan Atomic Energy Agency. It uses long hexagonal fuel assemblies, unlike the competing pebble bed reactor designs. HTTR first reached its full design power of 30 MW (thermal) in 1999.
Kairos Power is working on fluoride salt-cooled, high-temperature reactor technology. The California-based company received funding from the Department of Energy. The 35-megawatt thermal reactor ...
The fluoride salt-cooled high-temperature reactor (FHR), also called advanced high temperature reactor (AHTR), [29] is also a proposed Generation IV molten-salt reactor variant regarded promising for the long-term future. [25] The FHR/AHTR reactor uses a solid-fuel system along with a molten fluoride salt as coolant.
High pressure is a cost driver for any component, as it increases both quality requirements and required materials (thickness). Large, high pressure components require heavy weldings and forgings that have limited availability. A typical operating pressure for a pressurized water reactor (PWR) is over 150 atmospheres.
HTR-10 is a pebble-bed high-temperature gas reactor utilizing spherical fuel elements with ceramic coated fuel particles. The reactor core has a diameter of 1.8 metres (5 ft 11 in), a mean height of 1.97 metres (6 ft 6 in) and the volume of 5.0 cubic metres (180 cu ft), and is surrounded by graphite reflectors. The core is composed of 27,000 ...
It could also produce electricity and supply process heat. Up to 30% of this heat could be used to produce hydrogen via high-temperature electrolysis significantly reducing the cost of the process. [1] The envisioned reactor design is helium-cooled, using graphite-moderated thermal neutrons, and TRISO fueled. [2]