Which British reactor uses natural uranium and CO2 as coolant with water as a secondary coolant?

Which British reactor uses natural uranium and CO2 as coolant with water as a secondary coolant?

• A. AGR Reactor
• B. Magnox Reactor
• C. FNR Reactor
• D. Light Water Reactors

Answer: (B)

Magnox reactors are early British gas-cooled, graphite-m moderated units that use natural uranium metal as fuel. The primary coolant is carbon dioxide, which circulates through the reactor to pick up heat and transfer it to a steam generator. In that steam generator, water serves as the secondary coolant, carrying the heat to produce steam for the turbines. This combination—natural uranium fuel, CO2 as the primary coolant, and a water-based secondary circuit—fits the description precisely. The other options differ in fuel enrichment, coolant type, or moderator, so they don’t match this setup.

Magnox reactors are early British gas-cooled, graphite-m moderated units that use natural uranium metal as fuel. The primary coolant is carbon dioxide, which circulates through the reactor to pick up heat and transfer it to a steam generator. In that steam generator, water serves as the secondary coolant, carrying the heat to produce steam for the turbines. This combination—natural uranium fuel, CO2 as the primary coolant, and a water-based secondary circuit—fits the description precisely. The other options differ in fuel enrichment, coolant type, or moderator, so they don’t match this setup.