Tube support for moisture separator reheater

In combination with a moisture separator reheater for a nuclear steam generating power plant, said reheater comprising:

• a sealed elongated substantially horizontal tubular shell member, a cycle fluid inlet passing through said shell member in predetermined position, moisture separator means positioned within said shell member proximate the bottom portion thereof, heat exhanger means comprising a plurality of elongated metallic U-shaped members disposed substantially within said shell member, a tube sheet member supporting said U-shaped tube members at one end thereof, a tube support member means in supportive relationship with said tube members, the U-shaped tube members each having a top leg portion, a U-bend portion and a bottom leg portion, said top leg portion and said bottom leg portion positioned substantially horizontally within said shell member, said tube support member means having aperture means therethrough, each of said bottom leg portions and said top leg portions of said U-shaped tube members passing through said aperture means and supported by said tube support member means, a dome-shaped head member affixed to a first side of said tube sheet member in sealing relationship therewith forming a chamber therein, a partition means disposed within said chamber and dividing said chamber into a lower chamber and an upper chamber, said head member having a heating fluid inlet passing therethrough the improvement which comprises:
• said tube support member means proximate said U-bend portion of said U-shaped tube members each comprising an upper movable tube support member and a lower immovable tube support member, the remainder of said tube support means being immovable, said upper movable tube support member spacing and supporting said top leg portions of said U-shaped tube members, said lower immovable tube support member spacing and supporting said bottom leg portions of said U-shaped tube members, whereby the top leg portions of the U-shaped tube members proximate said U-bend are permitted to move to compensate for any increase in radius in the U-bend portion of the U-shaped tube member due to thermal expansion.