Abstract: A steam generator wrapper barrel/tube support plate connection assembly and method for assembling same which prevents interference due to thermal interaction between a wrapper barrel with a first coefficient to thermal expansion and a tube support plate with a second, relatively higher coefficient of thermal expansion. Interference is prevented by radially tuning the wrapper barrel, i.e., locally introducing preload via increased stud thread engagement in the jacking assembly to deform the wrapper barrel during assembly. During subsequent heat-up and operation the preload is relieved through outer shell expansion. In addition, heat and/or pressure dissolvable-surfaced or spring-surfaced shims or wedges are fit between the wrapper barrel and the tube support plate to further compensate for tube support plate thermal expansion.

Abstract: A sludge collection system for a vertically oriented nuclear steam generator is provided with an upwardly open chamber for receiving separated liquid and incoming feedwater that contain sludge particulates. A plurality of sludge collecting containers are positioned within the chamber and include a top rim encompassing an opening leading into the interior of each container. Generally flat perforated covers are positioned over each container such that a gap is formed between the cover and the adjacent top rim. Particulate material in the water entering the container can settle within the container because of relatively stagnant conditions. Sludge agitation and removal means are provided for remotely cleaning the containers. The sludge collection system components are sized to permit retrofitting this system into existing steam generators.