MOISTURE SEPARATION HEATER

PROBLEM TO BE SOLVED: To improve plant efficiency by reducing a flow rate of cycle steam flowing through a body interior and reducing its pressure loss or the like. SOLUTION: The moisture separation heater 12 of a one-stage reheat type includes the body 17, a cycle steam inlet 18 provided in a bottom of the body and introducing the cycle steam into the body, an MS element 21 obliquely disposed in a lower region of a body interior and separating moisture in the cycle steam, and a heater 22 disposed in a substantially center region of the body interior and equipped with a plurality of heat transfer tubes 31 carrying heating steam and a single heating steam head 32 communicated with the heat transfer tubes. A tube bundle size W/H is set so that the expression, 1.6