Critical power enhancement system for a pressurized fuel...

G - Physics – 21 – C

Patent

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G21C 3/322 (2006.01) G21C 1/08 (2006.01)

Patent

CA 2180545

A critical power enhancement system is pro- vided for a pressurized fuel channel type nuclear reactor comprising a plurality of fuel bundles (20) contained in a fuel channel and containing a plural- ity of fuel elements (22) horizontally oriented within the fuel channel. The system comprises at least one appendage (30) strategically located on each of cer- tain fuel elements along its length and projecting outwardly from the surface of the fuel element. The appendages (30) generate turbulence in the coolant flowing at locations along the length of the fuel bun- dle, where the critical heat flux is most likely to oc- cur. The presence of the appendages suppress the occurrence of the critical heat flux in the fuel bundle thereby increasing the safety limit on the maximum power that can be produced by the reactor.

L'invention concerne un système d'amélioration de la puissance critique destiné à un réacteur nucléaire du type à canaux de combustible sous pression comprenant une pluralité de faisceaux d'éléments combustibles contenus dans un canal de combustible, et contenant une pluralité d'éléments combustibles orientés horizontalement à l'intérieur du canal de combustible. Le système comprend au moins un dispositif placé stratégiquement sur chacun de certains éléments de combustible, sur sa longueur, et saillant extérieurement depuis la surface de l'élément combustible. Le dispositif génère des turbulences dans l'écoulement du fluide de refroidissement au niveau d'emplacement situé le long de la longueur du faisceau d'éléments combustibles, où le flux de caléfaction est le plus susceptible de se produire. La présence des dispositifs supprime l'apparition du flux de caléfaction dans le faisceau d'éléments combustibles, augmentant ainsi la limite de sécurité de la puissance maximum pouvant être produite par le réacteur.

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