The Rolls-Royce Rod Position Indication System (RPIS) measures and displays the actual position of the control rod. It delivers information which is used to monitor the consistency of individual rod positions, their positions within each group of rods, and between a rod position requested and position reached.
Processing of this information is used to activate an alarm where any inconsistency is detected.
Our RPIS is a qualified 1E system and is specifically designed for a PWR nuclear power plant. It is composed of two parts:
- A set of sensors (one sensor per rod) which includes a primary coil, several secondary coils and auxiliary devices.
- Electronics for power supply regulation of the primary coils, conditioning and processing of the signals coming from the secondary coils, and main control room interface
Our system is scalable and adaptable to any PWR reactor design, whatever the number and the length of control rods.
- Simplifies periodic testing and maintenance as there are no electronics in the reactor building;
- Improved signal stability and more reliable indication of each rod’s position due to the absence of moving parts;
- Safer operation thanks to fully independent measurements preventing common mode failure thus avoiding the simultaneous loss of the position of several rods;
- A Highly reliable system under severe environmental conditions (temperature up to 100°C with gamma radiation up to 10-3 Gy/h), through the simple design and electromagnetic operation of the sensors.