Abstract:
An in-core instrumentation system for a reactor module includes a plurality of in-core instruments connected to a containment vessel and a reactor pressure vessel at least partially located within the containment vessel. A reactor core is housed within a lower head that is removably attached to the reactor pressure vessel, and lower ends of the in-core instruments are located within the reactor core. The in-core instruments are configured such that the lower ends are concurrently removed from the reactor core as a result of removing the lower head from the reactor pressure vessel.
Abstract:
Etui pour confiner de la matière nucléaire usagée comportant une virole (2) d'axe longitudinale (X) obturée à une première extrémité longitudinale (4) par un fond (8) et une deuxième extrémité longitudinale (6) libre par laquelle l'étui est destiné à être chargé, un bouchon (10) destiné à obturer la deuxième extrémité longitudinale (6) libre de manière étanche, l'étui comportant également une bride (12) fixée sur la face intérieure de la virole (2) du côté de la deuxième extrémité longitudinale (6) libre, le bouchon (10) ayant au moins un diamètre extérieur sensiblement égal à au moins un diamètre intérieur de la bride (12), ledit bouchon (10) étant destiné à être soudé sur ladite bride (12) de sorte que la zone de soudure soit décalée radialement vers l'intérieur de l'étui, par rapport à la face interne de la virole (2).
Abstract:
This grid is of the type comprising at least two meshed grid parts (16, 18) intended to be superposed in a longitudinal direction (L), each grid part (16, 18) 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 (4) in the longitudinal direction (L) through the grid parts (16, 18), and a closed configuration allowing each fuel rod inserted through the grid parts (16, 18) to be clamped transversely between the grid parts (16, 18). According to one aspect of the invention, the grid (16, 18) comprises elements (32, 34) for transversely immobilizing the grid parts (16, 18) in the closed configuration, these means being designed to engage as the superposed grid parts (16, 18) are moved closer together in the longitudinal direction (L).
Abstract:
Cette grille est du type comprenant au moins deux parties de grille (16, 18) maillées destinées à être superposées suivant une direction longitudinale (L), chaque partie de grille (16, 18) s'étendant dans un plan transversal, et déplaçables l'une par rapport à l'autre suivant au moins une direction transversale entre une configuration ouverte d'insertion de crayons (4) de combustible nucléaire suivant la direction longitudinale (L) au travers des parties de grille (16, 18), et une configuration fermée permettant le serrage transversal entre les parties de grille (16, 18) de chaque crayon inséré au travers des parties de grille (16, 18). Selon un aspect de l'invention, la grille (16, 18) comprend des éléments (32, 34) d'immobilisation transversale des parties de grille (16, 18) en configuration fermée, agencés pour venir en prise par rapprochement suivant la direction longitudinale (L) des parties de grilles (16, 18) superposées.
Abstract:
A method and apparatus of circulating cavitation fluid within a cavitation fluid circulatory system, before or during cavitation chamber operation, as well as a means of draining and filling the chamber with minimal, if any, exposure of the cavitation fluid to the outside environment, is provided. The apparatus includes a network of conduits coupling the cavitation chamber to a cavitation fluid reservoir and at least one external fluid pump. Preferably the cavitation fluid reservoir serves the dual function of dual reservoir and degassing chamber. Manipulation of various valves within the conduit network allows the cavitation fluid to either be pumped from the reservoir into the cavitation chamber of from the cavitation chamber into the reservoir. A vacuum pump coupled to the degassing system can operate continuously or intermittently. The cavitation fluid circulation system can include a bubble trap and/or a heat exchange system.
Abstract:
Ce dispositif de réduction du diamètre d'un rond de sac équipe une enceinte telle qu'une boîte à gants. Il comprend une entretoise de réduction de diamètre (6) possédant un premier orifice circulaire (8) ayant un diamètre sensiblement égal au diamètre du rond de sac (4). Ce premier orifice est dirigé vers le rond de sac (4). Ce dispositif comprend par ailleurs un second orifice (10) dirigé vers l'extérieur de l'enceinte (2) en sens opposé au premier orifice, ce second orifice ayant une forme allongée, notamment ovoïde.
Abstract:
A method and apparatus of circulating cavitation fluid within a cavitation fluid circulatory system, before or during cavitation chamber operation, as well as a means of draining and filling the chamber with minimal, if any, exposure of the cavitation fluid to the outside environment, is provided. The apparatus includes a network of conduits coupling the cavitation chamber to a cavitation fluid reservoir and at least one external fluid pump. Preferably the cavitation fluid reservoir serves the dual function of dual reservoir and degassing chamber. Manipulation of various valves within the conduit network allows the cavitation fluid to either be pumped from the reservoir into the cavitation chamber of from the cavitation chamber into the reservoir. A vacuum pump coupled to the degassing system can operate continuously or intermittently. The cavitation fluid circulation system can include a bubble trap and/or a heat exchange system.
Abstract:
An apparatus and method for transferring spent nuclear fuel within a nuclear power plant. In one aspect, the invention is an apparatus for transferring a cask from a first position to a second position comprising: a first beam having a first proximal end and a first distal end, said first proximal end adapted for pivotal connection to a base; a second beam having a second proximal end and a second distal end, said second proximal end adapted for pivotal connection to said base; a member connecting said first distal end and said second distal end, said member comprising a lifting device adapted to raise and lower said cask; wherein said member, said first pivot beam, and said second pivot beam form a unitary structure; and means to rotate said unitary structure about an axis. In another aspect, the invention is a method of using the apparatus to transfer a cask.
Abstract:
The invention relates to a method and device for the conditioning of unsealed nuclear fuel rods for the transport and long-term storage or warehousing thereof. The invention comprises the use of a plurality of capsules (8) which are each intended to receive a fuel rod having a tubular casing (8a) which is closed at the ends thereof by means of end caps (9, 14). According to the invention, a loading structure (20) is placed in a pool in order to receive at least one capsule (8) having a vertical axis. A device for loading fuel rods into the capsule (8) is fixed to an upper open end of the structure (20). Defective rods are removed one by one and the empty capsules containing no rods are introduced one by one into the loading structure (20). For each of the capsules (8) that are intended to receive a defective rod, an upper end cap (14) is unscrewed from the capsule, a defective rod is introduced into the capsule (8) through a guide device belonging to the loading device, the upper end cap (14) is screwed back onto the capsule (8) and the capsule (8) containing the rod is placed in a slot in the support structure (20).
Abstract:
Um ein bleifreies Strahlenschutzmaterial aus einem Elastomer oder einem Plastomer als Matrixmaterial, in das als strahlungsabsorbierende Materialien Elemente mit einer Ordnungszahl grösser 50 oder deren Verbindungen eingearbeitet sind, so weiter zu bilden, dass eine sichere Strahlungsabsorption erreicht wird, und das es wirtschaftlich herzustellen und einfach zu verarbeiten ist, ist als strahlungsabsorbierende Materialien eine Kombination von zumindest Antimon und Bismuth vorgesehen. In Weiterbildung können weiter Wolfram und / oder Elemente aus der Gruppe der „seltenen Erden" vorgesehen sein.