EDF Rod Drop Monitoring

Rod Drop Monitoring Commercial Off-The-Shelf (COTS) System Integration, initially installed at Hinkley Point B, Dungeness and Hunterston B.

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Regulatory Requirements

The recording of control rod drop times is a regulatory requirement of the nuclear site license. To overcome the spares issues with obsolete equipment, ITI Group developed a Rod Drop Monitoring system using commercially off-the-shelf hardware and software. The solution can be easily adapted to the requirements of any nuclear power station, and has a proven install base.


Automatic data processing:

The previous system involved laborious manual intervention to process & print the data charts. All data processing & chart printing is fully automated in the new system.

Calibration facility:

The system includes a calibration spreadsheet HMI to allow operators to calibrate the rod height data against actual rod height (conversion of pulse inputs into analogue rod height).


The system provides increased resolution & extended windows for the data charts. This enhances the data quality for ‘post trip’ analysis work.

Chart Display:

multi-line detailed charts showing 2secs before trip and 28secs afterwards.


User access is based on an ‘administrator controlled’ user privileges set-up.

File management and archiving facility:

offering user-friendly off-line storage of trip & calibration data.

Real-time rod height display & slack switch status

Automatic collection of ‘reactor trip’ data.

Data window requirements:

  • Data window to start at 2 sec. pre trip condition.
  • Data window to extend for 28 sec. post trip condition
  • Data collection to include all 121 rods.
  • Data resolution: 20 msec.

Data visualised through chart display & printouts:

rod height versus time.

System calculates intermediate values

Alarm system

including reactor trip, power supply failure & system health status

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