Areva Np Gmbh

Thierry Muller

Angelo Beati

Dominique Hertz

Christelle Dumez

Jean-Paul Bombail

Fabien Hensch

Jean-Georges Alibaud

Philippe Dolleans

Michael Guillodo

Jean-François Rondemerre

Noemie Gomez

Emilie Maud Guillaume

Guy Barois

Jean-François Rondepierre

Noémie Gomez

Christel Dumez

Thierry Balancon

Olivier Cartier

A grid including at least two meshed grid parts intended to be superposed in a longitudinal direction, each grid part extending in a transverse plane, and the grid parts being moveable one relative to the other in at least one transverse direction between an open configuration for the insertion of nuclear fuel rods in the longitudinal direction through the grid parts, and a closed configuration allowing each fuel rod inserted through the grid parts to be clamped transversely between the grid parts. According to one aspect of the invention, the grid includes elements for transversely immobilizing the grid parts in the closed configuration, the immobilizing elements being designed to engage as the superposed grid parts are moved closer together in the longitudinal direction.

Nuclear fuel rod spacer grid and framework and assembly comprising such a grid

An assembly is provided including a mobile structure including a main pipe equipped with a first end intended to be connected to a water supply and a second end intended to be connected to a circuit connected to the primary circuit of the reactor, and including between these two ends in the direction of circulation of the water, a pump, a water heating device, an injector for continuously injecting the powdered neutron-absorbing element into the water of the main pipe, a first mixer for mixing and dissolving powder with water and a controller driving and controlling the flow rate of the water and the flow rate of the powder injected.

Assembly and method for injecting water containing a neurton-absorbing element to cool a nuclear reactor core in a crisis situation

The invention relates to a nuclear reactor primary circuit comprising a primary pipeline (), which defines an internal volume () and in which a primary nuclear reactor coolant downwardly runs, an additional pipeline () which is branched to the primary pipeline () and defines an internal volume communicating with the internal volume () of the primary pipeline () and a cuff () whose first end () is connected to the additional pipeline () and the second free end () is positioned in the internal volume () of the primary pipeline (). According to said invention, the second end () is delimited by a free peripherial edge () comprising at least one upstream and downstream sections () which are oriented towards the upstream, wherein the upstream section () penetrates into the internal volume () deeper from the primary pipeline () than the downstream section ().

Nuclear reactor primary circuit

The invention relates to a pressurised water nuclear reactor vessel, comprising:

Pressurised water nuclear reactor vessel

The nuclear fuel assembly having nuclear fuel rods and a support skeleton having two nozzles, guide tubes interconnecting the nozzles, and spacer grids for holding the rods, the grids being secured to the guide tubes. The assembly further has at least one lattice reinforcing device for reinforcing the support skeleton. The reinforcing device is placed between two spacer grids and is secured to the guide tubes. The invention is applicable to fuel assemblies for pressurized water reactors.

Nuclear fuel assembly comprising a reinforcing mesh device and the use of one such device in a nuclear fuel assembly

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St Helene, France

Thierry Muller