Very-high-temperature reactor

The very-high-temperature reactor (VHTR), or high-temperature gas-cooled reactor (HTGR), is a Generation IV reactor concept that uses a graphite-moderated nuclear reactor with a once-through uranium fuel cycle. The VHTR is a type of high-temperature reactor (HTR) that can conceptually have an outlet temperature of 1000 °C. The reactor core can be either a 'prismatic block' or a 'pebble-bed' core. The high temperatures enable applications such as process heat or hydrogen production via the thermochemical sulfur–iodine cycle.