Design Concept and Heat Transfer Analysis for a Double Pipe Channel for SCWR Type Reactors

Current CANDU-type nuclear reactors use a once-through fuel channel with an annulus gas insulating it from the moderator. The current reference design for a CANDU-type SCWR is to eliminate the annulus gap and use a ceramic insert to insulate the coolant from the moderator. An alternative approach being considered is to use the annulus gap as a coolant pre-heater in a double-pipe configuration (so-called re-entrant channel). The alternative …