Water supply tube for steam generator

A water supply tube for a steam generator comprising:

• an insert tube portion horizontally extending and configured to be inserted in a penetration hole penetrating a shell member of the steam generator;
• and
• a generator internal tube portion connected to the insert tube portion and arranged inside the steam generator,
• wherein the generator internal tube portion includes a tubular passage formed in an axial direction of the generator internal tube portion and an effluence unit allowing effluence of cooling water in the tubular passage from the tubular passage to a space in the steam generator, the tubular passage allowing cooling water supplied from outside the steam generator via the insert tube portion to flow in the tubular passage,
• wherein the tubular passage includes a first tilted portion which is tilted so that a side having a greater distance from the insert tube portion along a flow direction of cooling water is located vertically higher than a side having a smaller distance from the insert tube portion and a second tilted portion which is located with a greater distance from the insert tube portion along the flow direction than the first tilted portion and is tilted so that a side having a greater distance from the insert tube portion along the flow direction is located vertically lower than a side having a smaller distance from the insert tube portion, and
• wherein, in at least a portion of a section, along the flow direction, of the tubular passage between the first tilted portion and the second tilted portion, a bottom end of a cross section, perpendicular to the flow direction, of the tubular passage is arranged vertically higher than a horizontal plane including a top end of an inner wall surface of the insert tube portion at a connection between the insert tube portion and the generator internal tube portion.