Flow conditioning device for steam generator

A method for increasing the local hydraulic resistance in a tubelane region of a nuclear power plant steam generator, the method comprising:

• receiving fluid flow from a plurality of entrance apertures defined by an outer enclosure, wherein the entrance apertures are arranged in an array, and wherein the entrance apertures are in fluid communication with the tubelane region of the steam generator;
• directing the fluid flow from the entrance apertures in alternating directions through flow channels defined by a plurality of baffle plates defined within the outer housing;
• imparting turning and frictional pressure losses to the fluid flow through the flow channels;
• and
• directing exiting fluid flow through exit apertures into the tubelane region of the steam generator, wherein the plurality of exit apertures are defined by the outer enclosure, and wherein the plurality of exit apertures are arranged in an array.