Control and monitoring technology designed to maximise plant availability Engineering services

Rodline rod control system

rodlineRodline rod control system is designed to safely and reliably manage the Control Rod Drive Mechanism (CRDM) within the nuclear reactor.
Rodline is the latest generation of digital Control Rod Control System developed by Rolls-Royce, based on 40 years of proven leading-edge experience and successful operation in more than 80 nuclear reactors worldwide. The Rodline system drives the rods in individual steps by precisely energizing electromagnets of the CRDM, in predetermined sequences.
Thanks to its flexible and modular design, Rodline can be installed in a range of different reactor types, to meet the requirements of both new build and retrofit markets. Our technology is designed to be scalable with the number of rods being controlled adaptable to suite various types of CRDM mechanisms.

  • Safer and more available system thanks to coil-per-coil digital control
  • Easier operation and diagnostic through a comprehensive and modern man-machine interface
  • Enhanced maintenance thanks to standardized, hot-pluggable and self-configured power modules

Rod Position Indication System

rod positionThe 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

Boronline boron meter

Boron meterThe Boronline boron meter provides nuclear power plant operators with a permanent record of the boron concentration contained in a water cooling circuit by way of continuous sampling.
The equipment performs real-time measurements and processes them to compile assorted information that can be displayed or transmitted to other digital or analogue systems within the power plant unit. All of this information is generally used in the process to drive the reactor power.
Boronline standard equipment includes a sampling tank, neutron source, neutron detector, temperature probe, a rack that supports the conditioning and process electronics, and process display.

  • The operator knows in real time the concentration of boron due to permanent recorded/displayed measurements
  • The in-built technology brings safety to the operators by the continuous monitoring of the boron concentration during all the reactor operating conditions;
  • Increased reliability and stability of the measurement through the use of a proportional counter type detector

Reactivity meter

reactivity meterThe Reactivity meter measures changes in neutron flux. It assists nuclear power plant operators in sub-critical approaches and discrepancies when evaluating fluctuating responses caused by temperature, moving rod assemblies and diluted boron. The Reactivity Meter is commonly used at the start-up of the nuclear reactor after refuelling or any outage.

The Rolls-Royce Reactivity Meter can be both integrated into the Neutron Instrumentation System or a stand-alone system. The data processing is mainly PC-based and is compatible with SpinlineTM digital nuclear safety I&C technology to capture the neutron flux information.

Rolls-Royce Reactivity meter is entirely autonomous. It processes signals internally, polarizes the sensor and provides linear amplification of current over a wide dynamic:

  • 1 logarithm scale: -100,000 pcm / -1 pcm
  • 10 linear scales: from ± 10 pcm to ± 20,000 pcm
  • Resolution: 0.01 pcm
  • Response time: 125 ms to 2 s
  • Storage period: 125 ms
  • Experiment duration: 15 min. to 8 h

In-core instrumentation system

in-core instrumentation The In-core instrumentation system allows reactor operators to obtain information on the distribution of the neutrons flux as well as indications relative to the mapping of the temperatures inside the core of the reactor.

Information given by the system is used to check the calibration and response of ex-core flux detectors, monitor fuel burn-up and fuel inventories, or determine the position of a stuck rod.
The Rolls-Royce In-core instrumentation system provides operators with useful information to the control room as well as to the reactor unit computer for further processing.

Rolls-Royce In-core Instrumentation System improves operation and gives to operators new opportunities in terms of:

  • Follow-up of the operations
  • Timeliness of measurement campaigns
  • Creation of new scenarios
  • Troubleshooting analysis
  • Archiving and analysis of events

Rolls-Royce In-core Instrumentation System benefits from a powerful Supervision Man Machine Interface (MMI) with the following functions:

  • Display of the operating status
  • Historical log files
  • Alarms and trend curves
  • Help for fault diagnosis
  • Management of the functional parameters
  • Support to the performance of maintenance activities like the periodic tests