Your thermodynamics prof should have covered this is great detail. Also your heat exchange class prof and plant design prof and (possibly) your fluid flow too. 8<)
The typical nuke pant cannot generate superheated steam, but a coal plant - of the same electric power output! - is expected to generate power using superheated steam. Thus, you need more steam flow at lower (saturated) pressure and temperature into the HP turbine with a generic nuke plant. Phrased differently, there is more energy in a lb of steam in a coal plant than in a nuke plant. (Caution: I don't know the CANDU reactor characteristics: use the following AFTER you get the real spec's).
Energy across the turbine is the difference of inlet conditions - outlet conditions, but a typical clean turbine condenser is going to create just about the same outlet condensed water conditions regardless of type of plant.
Therefore, the nuke plant is slightly less efficient than the coal plant and must reject more heat energy (for the same electric power generated) into the raw cooling water flow. Because of this extra rejected heat in the cooling water, and because most US nuke plants are larger than most US coal plants, the outlet raw water at many (most?) nuclear plants must be cooled with the cooling towers in addition to the river water or lake water in order that the raw water outlet stays inside enviro limits during the hottest part of the year..