Decouple

Hard Lessons with Hot Helium

Apr 22, 2025
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INSIGHT

High Temperature Advantages

  • High temperatures improve thermal efficiency and allow flexible load following in gas turbines.
  • High temperature gas reactors uniquely enable industrial process heat applications, offering economic and safety benefits.
INSIGHT

Power Density and Core Design

  • High temperature gas reactors have roughly a tenth the power density of light water reactors due to helium loss and neutronics.
  • Their design requires tall, skinny cores for passive decay heat conduction and neutron moderation.
ANECDOTE

Peach Bottom Success Then Shutdown

  • Peach Bottom was a well-operated 40 MW electric demonstration with 88% availability and 74% capacity factor.
  • Despite good performance, it shut down due to economic competition from larger reactors nearby.
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