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Raised loop means the bottom of the SG is at about the same level as the reactor. This makes the thermal center higher. In the lowered loop design, the SG sits lower relative to the reactor than the raised loop design. The thermal center is not as high in the lowered loop plant.The benefit of a raised loop is with natural circulation in the event that you lose forced flow.
Natural Progression. DB was in service when TMI happened, in fact DB had a TMI type event before TMI did.
Interesting...since my career began the September following TMI, I thought I would have heard of the DB and Oconee incidents. I'll check Wiki but is there other methods of interesting research or reading?Thanks. Learn something new everyday still holds true.