Main Image


Information Exchange leverages experience and best practices across the industry and among CANDU utilities so that each member and supplier participant can make the most of lessons learned across the CANDU fleet.​​ The goal of the Information Exchange program is to enhance excellence in the safety, reliability, economic and environmental performance of CANDU stations worldwide by sharing operating experience and providing support to resolve technical and operating problems for all COG Members. The "CANDU Excellence through Collaboration" philosophy is the foundation of the Information Exchange program. The success of the Information Exchange program depends on the open sharing of information amongst all Members.​

​​Programs and Products

COGonline was updated to provide better search capabil​ities and ease of navigations for our members. The Member and Supplier Participant website is COG's most effective way of comm​​unicating with m​​​​embers and external organizations. C​OGonline is a secured site and the source of information about COG programs. COG regularly updates posted information to provide a status of plant performance, new items of interest, proceedings of meetings and workshops and access to databases relate​d to​ operating experien​​ces.​​​
The weekly OPEX Screening Meeting teleconference, chaired by COG, facilitates a CANDU screening committee that reviews events of significance from CANDU stations and other industry sources (WANO, INPO, IAEA, NRC). The committee determines applicability and significance to CANDU units, identifies generic issues, recommends action or information dissemination at operating stations and determines which events need to be reported to the nuclear industry via COG and WANO.​
Contains 30 years worth of valuable operating experience (more than 40,000 records) screened from CANDU plants and the nuclear industry. All screened events are entered in the OPEX database which is accessible through COGonline.​CANDU Events Notification database contains all event notifications posted by the COG members since January 1, 2000. These events have also been posted in the appropriate newsgroup.

COG maintains more than 50 topical newsgroups with subscriber interface for the convenience of COG members looking for the latest information on selected CANDU and industry events related to their areas of responsibilities. Each hot trend report has a packet of pertinent information including a topical discussion of contributors which have led to the "trend" of events. Impact videos show the trends in motion.

The online Q&A newsgroup provides an interactive forum for COG Members to post their questions and answers related to any problems they are experiencing or improvements they are considering. COG cross-posts all questions and answers to the appropriate newsgroup(s).​A good practice or innovation is a technique, program or idea that has been implemented at a CANDU plant and proven to have a positive impact on safety, reliability and economics of nuclear operations. COG began promoting the sharing of good practices amongst it's members in 2000 and has expanded the initiative to include innovative ideas. This product has become an effective tool to reduce cost, enhance safety and increase efficiency.​
Just-in-time (JIT) briefings and RapidOPEX and Workgroup Handbooks contain operating experience information to assist plant personnel to perform activities in the field. Each JIT briefing is a concise package of information describing a significant problem reported in a number of similar events and highlighting the important issues, causes and lessons learned. OPG, Bruce Power, NB Power Nuclear and Hydro Quebec have produced a large number of JIT briefings applicable to CANDU units. These are posted on COGonline, together with WANO JIT briefings that are applicable to CANDU stations, and are also accessible through the JIT briefings database. ​Station reports previously called Chemistry Newsletters are produced annually and include D2O Management, Radiation Dose and Radioactive Emissions (Environmental) for each CANDU station. An executive summary is included to obtain an overview of the information provided.​​
A quarterly newsletter provides station performance data, summarized events of operational significance affecting productivity and equipment problems at each station. Data is collected and used for benchmarking, historical records and comparing CANDU station performance with nuclear reactors around the world. COG maintains CANDU performance information and a database of station capacity factors and plant outages.​​​​​From time to time events and problems occur at nuclear stations that warrant technical assessment of their generic application to CANDU units and/or represent significant CANDU historical operating experience. these items have been captured as COG bulletins to serve as a permanent reminder of problems that have occurred, in order to help stations prevent similar incidents.

CANTEACH is a project to preserve technical knowledge of CANDU nuclear generating systems. The dedicated website ( provides a permanent record of CANDU technology information, a source of education and training material and serves as a library for shared documentation contributed by industry participants.​​COG provides "smart" facilitation to a variety of teams and workshops that allow member staff at appropriate levels to exchange operating experience and ​​address common issues. Teams include: engineering managers, outage managers, human performance, radiation protection, radioactive waste, reactivity management, training managers, valve users, fire protection and corrective actions. Meetings and proceedings​ are posted to COG online

Employees of COG member organizations can access all COG products from the COG member website:


COG delivers the Nuclear Professional Development Seminar, a three-week leadership program that takes place in the classroom and in the plant, providing an opportunity to examine leadership, management practices and performance.

In 2017, the University Network of Excellence in Nuclear Engineering (UNENE) and CAND​U Owners Group published The Essential CANDU, which provides a full and detailed briefing on the CANDU system. The textbook is available in a free PDF format: (Copyright UNENE)​



COG’s OPEX database of about 44,000 entries provides members searchable information to help solve problems today based on past experience from the entire CANDU fleet.COG holds weekly OPEX screening meetings where members agree on significance and discuss follow-up actions. Approximately 800 events are reviewed annually.COG hosts more than 150 forum meetings, peer groups, technical committee meetings and workshops each year for members
and supplier participants. Members can view all events in COG's event guide and online calendar on the COG member website.