Overview
The Gas Circulation System is responsible for moving carbon dioxide gas through the reactor core to remove heat produced by nuclear fission.
This is one of the most critical systems in an AGR, as it directly controls how heat is extracted from the fuel.
What it does
The system:
- circulates CO₂ gas through the reactor core
- removes heat from the fuel elements
- transfers that heat to the boilers
- maintains stable reactor temperatures
How it works
- Gas circulators (large fans/compressors) push CO₂ into the core
- Gas flows through fuel channels and absorbs heat
- Heated gas exits the core
- Gas passes through boilers (heat exchangers)
- Heat is transferred to water → producing steam
- Cooled gas is recirculated back into the core
Key Components
- Gas Circulators
- Reactor Core Channels
- Pressure Vessel
- Boilers (Heat Exchangers)
- Ducting and Flow Paths
Why it matters
⚠️ Warning
Loss of gas circulation can lead to rapid temperature increases in the reactor core.
- Directly controls core cooling
- Impacts thermal power output
- Essential for safe reactor operation
Operator Notes
💡 Tip
Always monitor coolant flow and temperature trends — not just single readings.