Placing Two Pickering Nuclear Units in Safe Storage – An OPG Success Story
9th International Conference on CANDU® Maintenance - 2011 December 04-06

Presented at:
9th International Conference on CANDU® Maintenance
2011 December 04-06
Toronto, Canada
Session Title:
Industry Performance Special Session C1

Mike Peckham (Ontario Power Generation)


OPG recently completed a $370M project to place Pickering Units 2 and 3 in Safe Storage while continuing to operate the other 6 units on the site.   This unique project was completed safely, on time and on budget and provided many lessons to share with the nuclear industry.

For economic reasons, OPG determined that Pickering Units 2 and 3 were not to be returned to service and instead were to be placed in safe storage.  Safe storage was defined as a defueled and dewatered state in which the two units were separated from the operating units and isolated from containment.  This state would significantly reduce maintenance costs.

The challenge was large and unique.  Units 2 and 3 were intimately interconnected with the operating units and the disconnection required over 400 modifications.   Operations challenges included upgrading equipment that had not been used in 7 years in order to defuel and dewater the units.

The project team met the challenge and provided some added benefits to the operating plant, including installation of a new diesel fire water system and completion of electrical maintenance that could only be done with fuel removed. 

Lessons learned included the benefit of establishing detailed end state reports; keeping modifications simple; use of an engaged vendor for design modifications; and ensuring constructability in each modification.  Assigning experienced operations and maintenance staff to the project early and use of the Vendors QA program with OPG quality surveillance were key enablers for the success.

OPG’s Vice President of Projects and Modifications, Mike Peckham, will share this Unique Project experience.

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