AGR
Advanced Gas-cooled Reactor
Advanced gas-cooled reactor (AGR) uses CO2 coolant and graphite moderator with enriched uranium fuel in stainless steel cladding.
Seven UK AGRs, each ~600 MWe, operate at 150 bar and 650°C outlet, using 2.3-3.0% enriched AGR fuel pins. Pre-stressed concrete pressure vessels enhance safety. All units scheduled for shutdown by 2028.
Why it matters now
AGR decommissioning informs UK new-build strategies like Sizewell C in 2025-2026; high-temperature experience relevant to HTGR SMRs.