Importance

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Abstract

An improved, grid-type flow distribution baffle for both providing lateral support for an array of heat exchange tubes and for generating a sludge-sweeping water current within a steam generator is disclosed herein. Generally, the improved baffle comprises a plurality of grid members for defining an array of square, tube-capturing cells, wherein each wall of the cell is closely adjacent and contactable with the side of the tube. Each of the cells is circumscribed by a flange at one of its ends which includes a substantially circular opening for allowing the tube to extend through the cell. The flange includes four flat portions spaced 90.degree. apart for rendering the flange flush with the center portion of each of the square walls which form the cells of the baffle. These flat portions allow the flange to closely circumscribe the tube without coming into contact with it, thereby avoiding 'point contact' between the flange and the tube. The improved baffle finds particular use when mounted over the tubesheet of a nuclear steam generator. The flanges which closely circumscribe each of the tubes create enough current-diverting fluid resistance within the baffle so that a relatively rapid, sludge-sweeping radial flow of water is directed over the tubesheet. However, a sufficient amount of space is left between the flanges and their respective tubes so that a sufficient amount of water flows through these cells to prevent localized boiling from occurring therein.

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First Claim