The invention relates to a device for measuring liquid level by means of optical reflectometry, to a structure comprising such a device and to a corresponding measuring method. The measuring device comprises: at least one optical fibre (15) to be immersed in the liquid via the free surface (13) of the liquid; a ligh...

The invention relates to a measuring device comprising: at least one optical fibre (15); a light source (17); and an analyser (19) for analysing light radiation back scattered by the optical fibre (15) and deducing therefrom the liquid level in relation to the bottom (9). The measuring device (1) comprises a floater...

The pump includes a diffuser (11) having a diffuser flange (51) clamped axially between the thermal barrier flange (31) and the volute (5), the diffuser (11) comprising an outer groove (65) surrounding the rotation axis (X), the thermal barrier flange (31) including an outer tenon (67) engaged in the outer groove (6...

The method for detecting a defect on a surface (12) comprises the following steps: - acquiring a plurality of images of the surface (12) by an optical device (14) having an optical axis, each image being acquired with a lighting of the surface in a lighting direction (E, E") given for each point on the surface (12) ...

The invention relates to an electronic device (18) for managing the display of data for controlling a nuclear power plant, the data coming from a plurality of control units (16A, 16B, 16C), each control unit being configured to perform at least one action among the acquisition of a value measured by a sensor (12A, 1...

The invention relates to a face plate (10, 11), made of silicon nitride, of a seal package (1) for a sealing system (4) of a shaft (7) of a reactor coolant pump in a nuclear reactor, said sealing system (4) being intended to ensure sealing between the primary circuit and the atmosphere, characterized in that said fa...

The invention concerns a programmable logic circuit (10) for controlling an electrical facility, in particular a nuclear facility, the programmable logic circuit including a functional unit (14) comprising: - a plurality of types of functional block (FB1, FBi, FBN), two distinct types of functional block being suita...

The method comprises the following steps: - acquisition of a plurality of quantities characterizing the operation of the nuclear reactor; - calculation of at least one critical thermal flux ratio with the aid of a deep neural network, the inputs of the deep neural network being determined by using the quantities acq...

The invention relates to a method for inspecting a metal surface (12). The method comprises the following steps: providing a first laser source (14) that is arranged to generate a first laser beam having a first wavelength comprised between 1000 nm and 1100 nm and a power higher than 1 W; providing a second laser so...

The device for carrying out interventions comprises an articulated robot arm (22) comprising a securing base (26), a terminal member (28) and at least one arm segment (30, 32) connecting the base (26) to the terminal member (28), and an intervention member (24) carried by the terminal member (28), the intervention m...

The method is for manufacturing a nuclear fuel assembly (2) comprising nuclear fuel rods (4) arranged in a bundle and a skeleton (6) supporting the fuel rods (4). The method comprise the steps of inserting fuel rods (4) into the skeleton (6) to obtain a fuel assembly (2) and packaging the fuel assembly (2) in view o...

The plate-shaped nuclear fuel element (2) comprises a core (4) made of a fissile material and a cladding (6), the cladding comprising a frame (8) defining a central aperture (10) receiving the core (4) and two cover plates (12) sandwiching the frame (8) and the core (4), wherein the frame (8) is made of a metallic f...

ABSTRACT NUCLEAR FUEL ASSEMBLY MANUFACTURING METHOD, NUCLEAR FUEL ASSEMBLY MANUFACTURING PLANT AND METHOD OF EXPANDING SUCH A PLANT 5 The method is for manufacturing a nuclear fuel assembly (2) comprising nuclear fuel rods (4) arranged in a bundle and a skeleton (6) supporting the fuel rods (4). The method com...

ABSTRACT NUCLEAR FUEL ASSEMBLY MANUFACTURING METHOD, NUCLEAR FUEL ASSEMBLY MANUFACTURING PLANT AND METHOD OF EXPANDING SUCH A PLANT 5 The method is for manufacturing a nuclear fuel assembly (2) comprising nuclear fuel rods (4) arranged in a bundle and a skeleton (6) supporting the fuel rods (4). The method com...

A tubular component of a pressurised water nuclear reactor has the following composition on a weight basis: - 0.8% = Nb = 2.8%; - traces = Sn = 0.65%; - 0.015% = Fe = 0.40%; preferably 0.020 % = Fe = 0.35 %; - traces = C = 100 ppm; - 600 ppm = O = 2300 ppm; preferably 900 ppm = O = 1800 ppm; - 5 ppm = S = 100 ppm; p...

The spacer grid element define a cell (17) extending along an extension axis (A) for receiving a nuclear fuel rod (4) and exhibits a polygonal cross-section including at least three supporting sides (20) distributed around the extension axis (A), wherein each supporting side (20) comprises an inwardly protruding cor...

Connection arrangement for mechanically connecting a first element and a second element, such as a guide tube and a tie plate of a nuclear fuel assembly The connection arrangement is for the mechanical connection of a first element (4) having a connection portion (8) to a second element (6) having a housing (10), th...

The bottom nozzle comprises a tubular body (16) having a lower opening (18) and an upper opening (20), a lower tie plate (24) extending across the upper opening (20) and a debris filter (28) received inside the tubular body (16) below the lower tie plate (24), wherein the bottom nozzle comprises connection members (...

A device (7) for raising or lowering a nuclear fuel assembly (12) in a pool (14) of a nuclear installation, comprising: - a guiding system (20) intended to be fastened to the pool, and - a basket (22) defining a housing (24) for receiving the nuclear fuel assembly and water (40) around the nuclear fuel assembly, the...

The top nozzle comprises an intermediate plate (26) axially positioned between an upper plate (24) and a lower plate (22) with being axially movable between an upper position and a lower position, one or several main spring member(s) (28) arranged such as to permanently push the intermediate plate (26) towards the u...

The inspection system comprises a supporting device (20) for supporting the fuel pellet(s) (4) such that the pellet axis (A) of each fuel pellet (4) coincides with a reference axis (B), and an optical measuring device (40) arranged for optically measuring the fuel pellet(s) (4), the optical measuring device (40) com...

The nuclear fuel rod comprises nuclear fuel contained in a cladding (4), the cladding (4) comprising a tube (6) and two end caps (8), the tube (6) extending along a central axis (A) and having two ends, each end cap (8) being fastened to a respective end of the tube (6), sealingly closing this end. The tube (6) is c...

The nuclear fuel cladding element comprises a substrate (16) made of a material based on zirconium and a protective coating (18) externally covering the substrate (16), the protective coating (18) being made of a material based on chromium, and having a columnar microstructure composed of columnar grains (20) and ha...

The method is for manufacturing a nuclear fuel assembly (2) comprising nuclear fuel rods (4) arranged in a bundle and a skeleton (6) supporting the fuel rods (4). The method comprise the steps of inserting fuel rods (4) into the skeleton (6) to obtain a fuel assembly (2) and packaging the fuel assembly (2) in vi...

The invention relates to a device (10) for raising or lowering a nuclear fuel assembly (12) out of and into a pool (14) of a nuclear facility, comprising: - a guide system (20); and - a vertically movable gondola (22) that defines a housing (24) for accommodating the nuclear fuel assembly and water; - a movable cove...

The invention relates to a nuclear fuel cladding produced with a substrate (14), which is made of pure zirconium or of a zirconium-based alloy, and a multilayer protective coating (16), which covers a surface (14B) of the substrate (14), the protective coating (16) comprising a main layer (18) made of pure chromium ...

The manufacturing method is intended for the manufacture of a nuclear fuel rod cladding (4) comprising a substrate (14) covered with a protective coating (16). The manufacturing method comprises providing the substrate (14) and applying the protective coating (16) to the substrate (14) by physical vapour deposition ...