Overview
The Reactor Protection System (RPS) is a critical safety system designed to automatically shut down the reactor if unsafe conditions are detected.
Its primary function is to protect the reactor core, plant systems, and personnel by preventing conditions that could lead to damage or loss of control.
What it does
The RPS continuously monitors reactor conditions and will:
- automatically trigger a SCRAM (reactor shutdown)
- insert control rods into the core
- isolate or disable unsafe systems
- prevent operation outside safe limits
How it works
- Sensors monitor key reactor parameters
- Signals are sent to the protection logic system
- Conditions are compared against safety limits
- If a limit is exceeded → RPS activates
- Control rods are rapidly inserted
- Reactor power decreases to a safe state
Key Parameters Monitored
The Reactor Protection System typically monitors:
- Reactor power (MW / neutron flux)
- Core temperature
- Coolant flow (CO₂ circulation)
- Pressure levels
- Water/steam conditions
- Rate of power increase
Common Trip Conditions
The reactor may automatically shut down if:
- power exceeds safe limits
- coolant flow is lost or reduced
- core temperature rises too high
- pressure limits are exceeded
- rapid power increase is detected
SCRAM System
⚠️ Warning
A SCRAM is an emergency shutdown and should be treated as a serious event.
A SCRAM is the primary action of the RPS:
- control rods are fully inserted
- fission reaction rapidly decreases
- reactor transitions to a safe state
Why it matters
- prevents reactor damage
- protects against overheating
- ensures safe operating limits
- provides automatic response to failures
Operator Notes
💡 Tip
The RPS is designed to act faster than a human operator — do not attempt to override safety systems.
ℹ️ Note
After a trip, the cause must always be identified before restarting the reactor.