CNSC Review of the Long-Term Safety Case for a Deep Geological Repository

Abstract of the technical presentation presented at:
ENSI/CNSC Information Exchange Meeting
May 13, 2016

Prepared by:
T.S. Nguyen
Canadian Nuclear Safety Commission


Ontario Power Generation (OPG) has applied to the CNSC for a licence for site preparation and construction for a deep geological repository (DGR) for low- and intermediate-level waste (LILW) in a sedimentary rock formation in southern Ontario. In support of the licence application and the environmental assessment process, a long-term safety case was submitted to provide multiple lines of evidence that people and the environment would be protected for very long periods of time after the DGR is closed and sealed. CNSC staff have reviewed the long-term safety case by benchmarking against international standards and best practices, performing independent calculations, conducting independent scientific research and seeking external advice on key safety aspects. Staff’s overall conclusion was that OPG DGR’s long-term safety case is sufficient and acceptable for the purposes of the environmental assessment and the licence application.

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