Servelec Controls are currently engaged by EDF Energy in a series of major contracts, stretching over 10 years, to replace the Diagnostic and Monitoring Systems (DMS) on the fuel routes at both Torness and Heysham 2 nuclear power stations.

 The DMS systems in each of the fuel route plant areas (Fuelling Machine, Irradiated Fuel Disposal, Pond & Flask and Maintenance Cells) provides operator support by supplying real-time graphical and historical displays ofplant and protection system states via local dedicated workstations. Central real-time and historical data serversalso provide equivalent plant information more widely within the stations via non-dedicated standard desktop workstations.

 The new DMS systems have been designed to permit the previously existing DMS functionality implemented in legacy applications running on obsolete DEC VAX/VMS hardware to be migrated to modern industry standard hardware and software platforms.

 As a requested addition to the DMS, Servelec Controls have successfully implemented, installed and commissioned data concentrator units which are Siemens PLC based units designed for high speed data capture used in hoist monitoring data acquisition and analysis complete with calibration HMIs. As part of these works Servelec Controls also developed custom interfaces to legacy GEC GEM80 and Schlumberger Imp equipment.


The main requirement of the DMS is to fulfil the following objectives:

  • Identify, locate and resolve quickly any problems which may occur within the fuel route equipment.
  • Verify that all equipment is operating correctly and to aid the process of routine testing.
  • Present information in an easily understandable way, particularly when it is needed to visualise operations
    taking place in highly protected areas.
  • Monitor continuously the performance of safety-critical operations.
  • Provide fuelling machine hoist condition monitoring.
    Provide logs of signal changes across the plant areas for engineering investigation via the site data recording facility.
  • Provide a logging facility to assist in the periodic Maintenance Interval Test Schedule (MITS) on plant sensors and electro-mechanical devices.


  • On-line diagnostics aid down to the level of
    individual plant transducers resulting in minimal
  • High quality dynamic graphical displays ensuring
    the best possible visibility of the plant process.
  • Brake Condition Monitoring of key equipment improves the scheduling of maintenance activities.
  • Load Height Monitoring.
  • Grab Load / Springpack Monitoring.


  • Desktop view available to engineers external to the Radiological Controlled Area.
  • Reduced downtime.
  • Increased process visibility to plant operators.
  • Predictive/preventative maintenance.
  • Flexibility of scheduling maintenance activities thereby achieving substantial savings in equipment outage time.

EDF Energy - Torness and Heysham Case Study

Click here to download the EDF Energy case study

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