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High Temperature Gas-cooled Reactor (HTGR)

What's so interesting about them?

High Temperature Gas-cooled Reactors (HTGRs), or Very High-Temperature Gas Reactors (VHTRs), are the mavericks of nuclear energy, disrupting the conventional norm. Picture scientists contemplating, “What if we ditched the usual water routine and cranked up the heat with super-hot gases to whip up some electricity?” This out-of-the-box notion has been percolating in the scientific community, catching the eye of enthusiasts.

Fuel

Fuel

These reactors use enriched Uranium fuel pellets. These are housed in fuel rods.

Moderator

Moderator

VHTRs use graphite as a moderator.

Coolant

Coolant

All existing VHTRs use Helium as coolant.

Typical technical data:

Neutron Spectrum Outlet Temperature (Degrees Celsius) Fuel Cycle Net Electrical Energy Generation seen in Development (MW)
Thermal
900-1,000
Open
250-300

What is happening with them today?

Taking the lead in this heat-powered revolution are countries like China, the United States, and Japan, pooling their resources to propel VHTR technology into uncharted territories. What sets VHTRs apart is their knack for reaching staggering temperatures, akin to a nuclear oven turning up the dial to unprecedented levels. It’s like tapping into the potency of scorching steam to fuel our electricity needs.

Although VHTRs aren’t illuminating our homes just yet, researchers are constructing pint-sized prototypes to unravel the complexities of these high-temperature reactors.

Matt Moore

World Nuclear Association – Generation IV Nuclear Reactors
The Generation IV International Forum – Very-High-Temperature Reactor (VHTR)
The Generation IV International Forum – Technology Systems