Modularised MSR Upgrade

摘要

When Duane Arnold BWR came on line in early 1974, it had an initial design rating of 565.7MWe, and was provided with two of the earliest Moisture Separator Reheater (MSR) vessels designed with two-stage reheaters. These consist of a two-pass HP reheater bundle taking throttle steam, and a separate two-pass LP reheater receiving extraction steam from an intermediate stage of the HP turbine. The HP. reheaters presented problems from the very outset in that their steam/condensate outlet mixture carried far too much excess steam. Several efforts were made to control this excess loss through the use of orifices. However, these efforts were ultimately unsuccessful, and a continuing power loss resulted.