Nozzle penetration for a nuclear reactor pressure vessel...

Details Nozzle penetration for a nuclear reactor pressure vessel... Nozzle penetration for a nuclear reactor pressure vessel...

G - Physics

21

C

359/40

G21C 13/02 (2006.01) G21C 13/032 (2006.01) G21C 13/04 (2006.01) G21C 13/073 (2006.01)

Patent

CA 1142659

ABSTRACT In a nozzle entry for a pressure vessel closure, the nozzle is of a material different than that of the clo- sure. In addition the closure is provided with an internal cladding. In order to avoid heat stresses on the coupling between the nozzle and closure, a compensating ring is provided between a shoulder on the nozzle and a shoulder on the closure. The axial length of the compensating ring and its material are selected so that the change in elonga- tion resulting from heat expansion of the nozzle and closure materials is compensated over a distance which takes in the shoulders and the coupling. The material and axial length can be selected in such a way that a predictable stress is created in the coupling upon heating.

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