COG Risk-Informed in-Service Inspection (RI-ISI) Project
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 A1

Mehdi Rezaie-Manesh (Ontario Power Generation)
Patrick O’Regan (EPRI)
Scott Chesworth (Structural Integrity Associates, Inc.)


In 2009, CNSC prepared “Guidelines for Risk-Informed In-service Inspection for Piping,” that provided guidance for licensees to develop a RI-ISI program as an alternate to the current CSA N285.4 and augmented programs for piping inspection.  In response, a COG project was initiated to develop a best-fit methodology for the CANDU design and evaluate plant risk levels between current and RI-ISI inspection programs. EPRI RI-ISI was used as a starting point for methodology development.  The effectiveness of current piping inspection programs in managing risk-significant locations was evaluated, and potential risk reductions associated with relocating or adding inspections were investigated.

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