Method and configuration to reduce fatigue in steam drums

A heat recovery steam generator comprising:

• a plurality of generation tubes having water passing therethrough to generate steam and water by exchanging heat with a gas flow passing through the heat recovery steam generator;
• a riser fluidly connected to the plurality of generation tubes to collect the steam and water passing through the plurality of generation tubes;
• a first steam drum for receiving the collected water and steam from the riser, the first steam drum defining a first inlet and a first outlet, the first inlet positioned in a bottom portion of the first steam drum, the first outlet disposed at a too portion of the first steam drum, the riser coupled to the first inlet;
• a second steam drum for receiving a portion of the water and steam directly from the first steam drum, the second steam drum defining a second inlet positioned in a bottom portion of the second steam drum;
• a connection line fluidly coupling the first outlet with the second inlet for carrying the water and steam exiting the first steam drum to the second steam drum;
• a steam separator disposed within the second steam drum being in fluid communication with the second inlet, the steam separator configured to separate steam from the received water and steam to form a separated steam;
• and
• a steam flow outlet positioned in the second steam drum, the steam flow outlet adapted to release the separated steam from the second steam drum.