The Enhanced CANDU 6 (EC6) is a 740 MWe pressure tube reactor designed by Atomic Energy of Canada Limited (AECL). The EC6 design benefits from the proven principles and characteristics of the CANDU 6 design, which is currently in operation in several countries in the world, such as natural uranium fuel, two independent safety shutdown systems, a separate low-temperature, low-pressure moderator (which provides an inherently passive heat sink by permitting heat to be removed from the reactor core under abnormal conditions), a reactor vault that is filled with cool light water (which surrounds the reactor core, providing another passive heat sink), on-power refueling, and a modular, horizontal fuel channel core. The EC6 design includes a more robust containment with thicker walls and a steel liner, enhanced severe accident management, addi­tion of the emergency heat removal system as a safety system, improved shutdown performance for larger loss of coolant accident margins, and a plant life of 60 years with one life extension of critical equipment such as fuel channels and feeders at mid-life. The Canadian Nuclear Safety Commission (CNSC) is currently conducting the design review of the EC6.