The modular high temperature gas-cooled reactor (HTGR) incorporated with helium turbine is considered as one of the leading candidates for future nuclear power plants.

The paper introduces the helium turbine which used in helium refrigerator of space environment simulator, including its design, setting-to-work test and its characteristics.

So it's a simple cycle where the gas from, and this is helium gas now, is circulated through the reactor and goes right to the gas turbines, and it's a gas turbine not a steam turbine.