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Plant Life Management (Life Cycle Management)

Candu is committed to helping customers achieve optimum and safe reactor operation. Our proactive plant life management and plant life extension programs are designed to help reactors achieve long life, high reliability and high predictability. We offer our utility customers expert support to promote plant life extension, return to service of laid up nuclear units, longer operating cycles, operations and maintenance cost reductions, and economic upgrades.

  • Plant Life Management (PLiM)
  • ChemAND®
  • ThermAND

Plant Life Management (PLiM)

Candu's integrated Plant Life Management (PLiM), also known as Life Cycle Management, is designed to help utilities maximize revenue from nuclear assets. We offer systematic health assessments for passive and active components (life condition assessment), system-based maintenance assessments, preventive maintenance and optimization of customers’ system health monitoring strategies. 

Our experts can:

  • improve/update plant component programs, including transient monitoring, in-service inspections, periodic inspection programs, relief valves and heat exchangers
  • provide economic evaluation and business case support
  • extend outage intervals and improve output options
  • provide tools, procedures and plans, training and R&D
  • supply data management support tools, including chemistry, systems and component health monitors


Candu offers a new system health monitor, ChemAND (Chemistry Analysis and Diagnostics), to monitor and manage CANDU plant chemistry. ChemAND tracks systems online in real-time, improving the monitoring and control of plant chemistry, enhancing capacity factors and extending plant life. 

ChemAND features automated monitoring, alarming, diagnostics, prediction and online execution of analysis codes. It provides plant operators with on-the-spot access to current and past plant chemistry conditions, and offers models to assess the effect of these conditions on plant life. It makes chemistry information more accessible, facilitates the sharing of information, promotes a timely response to, or predicts, events, and facilitates management of equipment health and lifetime. 

An effective tool in existing stations, ChemAND is also an integral part of the Smart CANDU® reactor concept. 


Candu has health monitors for existing stations as integral parts of the Smart CANDU reactor concept. ThermAND is a system health monitor for heat transport circuits and is a close relative of ChemAND. 

ThermAND provides monitoring and diagnostic functionality to help manage the health of the major CANDU heat transport systems, including the primary heat transport system (HTS), the secondary heat transport system (steam cycle), the moderator, and auxiliary systems, such as end-shields. 

Health monitoring of these systems will include performance and condition monitoring of the piping and components such as pumps, vessels and heat exchangers. Planned enhancements include predictive models that will help utilities better manage system health.


Effectiveness and efficiency are key to maintenance today and more effort is being put into understanding, optimizing, planning and improving maintenance, surveillance and inspection practices. 

Candu offers SYSTMS (SYstematic approach for the development of STrategy for Maintenance and Surveillance), a fully integrated, user-friendly, software tool to assist plants in dealing with these demands.  Features include support for criticality evaluation, single point vulnerability evaluation, maintenance strategy development, and critical spare parts evaluation.  SYSTMS also supports Failure Modes and Effects Criticality Analysis (FMECA).