Abstract: Segmented stayrod for restricting transverse displacement of a nuclear heat exchanger tube support plate. The stayrod includes a first rod segment interposed between the tubesheet and the first support plate, the first rod segment having an externally threaded riser extending through the hole formed in the first support plate. The stayrod also has a second rod segment interposed between the first support plate and the second support plate, the second rod segment having an internally threaded end portion for threadably engaging the threaded riser of the first rod segment. The second rod segment also has an externally threaded riser extending through the hole formed in the second support plate. An internally threaded fastener threadably engages the riser of the second rod segment for fastening the second rod segment to the second support plate. In this manner, the first support plate is captured between the first rod segment and the second rod segment.

Abstract: This patent discloses a secondary fluid supply system for a steam generator used in nuclear reactor power plants. The secondary fluid supply system comprises a secondary fluid (feedwater) inlet nozzle near the base of the steam generator shell, a feedwater riser pipe spaced between the shell of the steam generator and the tube bundle wrapper, the upper end of the feedwater riser pipe being connected to a distribution ring having a plurality of spray nozzles positioned in the recirculating pool above the top of the U-shaped heat exchanger tubes.