Pebble-bed reactor
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A pebble-bed reactor is a type of nuclear reactor where the nuclear fuel is contained within a bed of pyrolytic graphite spheres, with the graphite serving as a neutron moderator. Pebble-bed reactors
A graphite fuel pebble for a pebble-bed reactor
AVR in Germany.
A high-temperature gas-cooled reactor is a type of gas-cooled nuclear reactor which uses uranium fuel and graphite moderation to produce very high reactor core output temperatures. All existing HTGR r
Pebble-bed reactor
…is contained within a bed of pyrolytic graphite spheres (pebbles), with the graphite serving as a neutron moderator. Pebble-bed reactors are typically high temperature gas-cooled reactors (HTGRs), and are capable of being refueled during operation. The helium-cooled PBR design is considered a type of very-high-temperature reactor (VHTR…
Refueling floor at Fort Saint Vrain HTGR, 1972
A simplified flow diagram of a 1,100 MWe HTGR.