Type of steam generators

The main differences between the steam generators (SGs) at the single-unit CANDUs (including most of Indian PHWRs) and the multi-unit CANDUs are due to the time when the NPPs were designed and built, as the later units were able to take advantage of experience gained during the early operation of the multi-unit plants. Some examples include design of steam generators, selection of tube material, design of secondary side supports, chemistry control, etc.