Demonstrating leak-before-break for CANDU heat transport piping


The leak-before-break approach is being used for Ontario Hydro's Darlington nuclear generating station as an alternative to the provision of pipe-whip restraints on large diameter primary heat transport system piping. These technological developments have been used by Ontario Hydro as the nucleus of an approach for demonstrating that CANDU Class 1 carbon steel piping will not break catastrophically; at worst it would leak at a detectable rate and corrective action would be taken well before catastrophic rupture could occur. The present paper describes how the need for a leak-before-break approach evolved, considerations given to developing an approach, and how it is being applied. Finally, the paper updates the status of this program and discusses future plans in this area. © 1988.

Publication Title

International Journal of Pressure Vessels and Piping