Consolidated nuclear steam generator

Claim 2

A steam generator modular arrangement which comprises: a support plate; a plurality of heat exchangers, each of which is supported at one end by said support plate; a manifold; a plurality of flow lines, each of which is connected at one end to said manifold and at the other end to one of said heat exchangers; said heat exchangers being positioned longitudinally staggered relative to one another; said heat exchanger having a steam header, a feedwater header spaced from said steam header, a pair of tube sheets interposed between said headers and each joined to one of said headers to form a steam chamber and a feedwater chamber respectively, a feedwater tube passing through said steam chamber to establish fluid communication with said feedwater chamber, a plurality of steam generation tubes longitudinally disposed between and secured to said tube sheets to establish fluid communication between said feedwater and steam chambers, each of said steam generation tubes including a larger diameter central tubular portion terminated at each end by a smaller diameter tubular portion, a plurality of transversely disposed spacer grids in engagement with said steam generation tubes, resilient detents formed on said spacer grids to engage surfaces on said steam generation tubes and restrain the vibration thereof, wherein said steam chamber is in fluid communication with one of said flow lines; and a shroud concentric with and disposed outside of said feedwater tube, said shroud being secured in said tube sheets.

Claim 3

A steam generator arrangement which comprises: a support plate; a plurality of heat exchangers, each of which is supported at one end by said support plate; a manifold; a plurality of flow lines, each of which is connected at one end to said manifold and at the other end to one of said heat exchangers; said heat exchangers being positioned longitudinally staggered relative to one another; said heat exchanger having a steam header, a feedwater header spaced from said steam header, a pair of tube sheets interposed between said headers and each joined to one of said headers to form a steam chamber and a feedwater chamber respectively, a feedwater tube passing through said steam chamber to establish fluid communication with said feedwater chamber, a plurality of steam generation tubes longitudinally disposed between and secured to said tube sheets to establish fluid communication between said feedwater and steam chambers, each of said steam generation tubes including a larger diameter central tubular portion terminated at each end by a smaller diameter tubular portion, said larger diameter central tubular portions of said steam generation tubes in each of said longitudinally staggered heat exchangers being positioned in lateral alignment relative to each other, a plurality of transversely disposed spacer grids in engagement with said steam generation tubes, resilient detents formed on said spacer grids to engage surfaces on said steam generation tubes and restrain the vibration thereof, wherein said steam chamber is in fluid communication with one of said flow lines; and a shroud concentric with and disposed outside of said feedwater tube, said shroud being secured in said tube sheets.

Claim 4

A steam generator arrangement which comprises: a support plate; a plurality of heat exchangers, each of which is supported at one end by said support plate; a manifold; a plurality of flow lines, each of which is connected at one end to said manifold and at the other end to one of said heat exchangers; said heat exchangers being positioned longitudinally staggered relative to one another; said heat exchanger having a steam header, a feedwater header spaced from said steam header, a pair of tube sheets interposed between said headers and each joined to one of said headers to form a steam chamber and a feedwater chamber respectively, a feedwater tube passing through said steam chamber to establish fluid communication with said feedwater chamber, a plurality of steam generation tubes longitudinally disposed between and secured to said tube sheets to establish fluid communication between said feedwater and steam chambers, each of said steam generation tubes including a larger diameter central tubular portion terminated at each end by a smaller diameter tubular portion, said larger diameter central tubular portions of said steam generation tubes in each of said longitudinally staggered heat exchangers being positioned in lateral alignment relative to each other, a plurality of transversely disposed spacer grids in engagement with said steam generation tubes, resilient detents formed on said spacer grids to engage surfaces on said steam generation tubes and restrain the vibration thereof, wherein said steam chamber is in fluid communication with one of said flow lines; and a shroud concentric with and disposed outside of said feedwater tube, said shroud being secured in said tube sheets.