Radiation shield and shielded gas conduit for a reactor pressure vessel

A shielded gas conduit for a reactor pressure vessel comprising:

• a conduit housing forming a passageway for cooling gas, said passageway comprising two separate coaxially arranged conduits with cooling gas flowing in one direction in the outer conduit and cooling gas flowing in the opposite direction in the inner conduit;
• a displacement body comprising an inner part and an outer part surrounding said inner part on all sides and wherein said inner and outer parts are made of different materials and said outer part is comprised of two releasably joined structural elements arranged centrally within said housing and having a symmetrical shape about an axis of rotation coinciding with the longitudinal axis of said conduit housing;
• a shielding annulus surrounding said displacement body at a distance to define a first annular flow path for reactor cooling gas communicating with said inner conduit within said conduit housing, said shielding annulus having an inner surface substantially following the contour of the said displacement body;
• means for mounting said shielding annulus within said conduit housing, said means and the outer surface of said shielding annulus defining a second annular flow path for reactor cooling gas communicating with said outer conduit;
• and
• a plurality of mounting elements fixedly securing said displacement body to said shielding annulus.

A shielded gas conduit for a reactor pressure vessel comprising:

• a conduit housing forming a passageway for cooling gas, said passageway comprising two separate coaxially arranged conduits with cooling gas flowing in one direction in the outer conduit and cooling gas flowing in the opposite direction in the inner conduit;
• a displacement body comprising an inner part and an outer part surrounding said inner part on all sides and wherein said inner and outer parts are made of different materials and said inner part of the displacement body is releasably fastened to said outer part arranged centrally within said housing and having a symmetrical shape about an axis of rotation coinciding with the longitudinal axis of said conduit housing;
• a shielding annulus surrounding said displacement body at a distance to define a first annular flow path for reactor cooling gas communicating with said inner conduit within said conduit housing, said shielding annulus having an inner surface substantially following the contour of the said displacement body;
• means for mounting said shielding annulus within said conduit housing, said means and the outer surface of said shielding annulus defining a second annular flow path for reactor cooling gas communicating with said outer conduit;
• and
• a plurality of mounting elements fixedly securing said displacement body to said shielding annulus.