Westinghouse Electric Corporation

Thomas A Pitterle

Hermann O Lagally

Warren R Junker

Robert F Keating

William K Cullen

Norman R Singleton

Bernard L Silverblatt

Method of restricting transverse displacement of a nuclear heat exchanger tube support plate during a transient event, the support plate having a plurality of holes therethrough for passage of respective ones of a plurality of heat transfer tubes. The method includes radially expanding the tube adjacent the first side of the support plate to define a first expanded region thereat, the tube being expanded to a diameter greater than the diameter of the hole formed through the support plate. The method further includes radially expanding the tube adjacent the second side of the support plate to define a second expanded region thereat, the tube being expanded to a diameter greater than the diameter of the hole formed through the support plate. The first expanded region and the second expanded region coact to restrict transverse displacement of the support plate because the support plate is firmly captured between the first expanded region and the second expanded region.

Method of restricting transverse displacement of a nuclear heat

A steam generator has a bundle of U-shaped tubes arranged in spaced rows and columns with a pair of spaced rows of elongated primary antivibration bars installed between U-shaped portions of the tubes in the spaced columns and a pair of spaced retainer members disposed about the exterior of U-shaped portions of the tubes with opposite ends of the primary bars being rigidly attached to the respective retainer members. An antivibration apparatus is provided for substantially closing gaps between the U-shaped tube portions in the columns and the primary bars. The apparatus includes a row of elongated supplementary antivibration bars disposed between the rows of the primary bars. The supplementary bars extend between the U-shaped portions of the tubes through the space between, at the most, every other one of the spaced columns thereof. A support member extends across the outside of the U-shaped portions of the tubes and the supplementary bars are rigidly attached at their outer ends to the support member such that they are unsupported at their inner ends and thereby extend in cantilevered fashion between tubes. Each supplementary bar is capable of expansion in a transverse dimension extending between the tubes so as to cause deformation laterally outward away from the respective supplementary bars of longitudinal spans of the tubes extending between the spaced row of primary bars for substantially closing any gaps existing between the tubes and primary bars.

Steam generator tube antivibration apparatus

Steam generator tube antivibration apparatus and method

A steam generator for nuclear power plant applications. U-shaped heat exchanger tubes within said steam generator are provided with compliant antivibration bars at the U-shaped portion of the tubes. Flexible plates located at opposite sides of the antivibration bars are placed in contact with the opposite sides of the rows of tubes. Support ribs spaced along the length of the compliant bars limit the deflection of the flexible plates and establish the effective length of the flexible plates. The ribs in successive columns of antivibration bars are located between the ribs of the bars of each preceding and following row.

Compliant antivibration bar for a steam generator

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Unity Township, Westmoreland Township, PA, United States of America

Thomas A Pitterle