WO1999003107A1 - Grid with mixing vanes for nuclear fuel assembly - Google Patents
Grid with mixing vanes for nuclear fuel assembly Download PDFInfo
- Publication number
- WO1999003107A1 WO1999003107A1 PCT/FR1998/001490 FR9801490W WO9903107A1 WO 1999003107 A1 WO1999003107 A1 WO 1999003107A1 FR 9801490 W FR9801490 W FR 9801490W WO 9903107 A1 WO9903107 A1 WO 9903107A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grid
- assemblies
- fins
- flows
- flow
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/322—Means to influence the coolant flow through or around the bundles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- the present invention relates to grilles with mixing vanes intended for nuclear fuel assemblies, having a skeleton consisting of two end pieces, guide tubes connecting the end pieces and grids carried by these guide tubes.
- These grids include two sets of interleaved metal plates to delimit cells for receiving fuel rods, replaced at certain nodes of the network thus formed by guide tubes.
- At least some of the grids are provided, generally on their downstream face in the direction of the flow of the refrigerant, with fins intended to cause transverse currents mixing the refrigerant streams in the space situated downstream of the grids. At least some of the grids have the additional function of holding the pencils at the nodes of a regular network or even of supporting them. Numerous fin arrangements have already been proposed, intended to ensure a compromise between the homogenization of the temperature of the fluid nets, in order to postpone the appearance of the boiling crisis in the case of pressurized water reactors, and the pressure drop imposed on the fluid.
- the grids of this type usually used at present include, in the four sectors of the grid separated by the medians of the grid, a provision which causes a flow at the outlet of the grid, the transverse component of which is oriented along the 'one of the diagonals of the grid, in alternating directions.
- FIG. 1 shows the directions of flow in such a grid with 17 ⁇ 17 cells, provided for 25 guide tubes such as 8, occupying the locations indicated by circles.
- the currents created do not have an equal intensity in the radial direction, in particular because the paths traveled have different lengths and that the disturbances of the flow are variable.
- the transverse flows attenuate differently along the flow.
- the transverse currents in two adjacent assemblies are in opposite directions to the interface between assemblies, except as regards the few cells closest to the corners of the assemblies.
- two currents of opposite direction to the interface tend to cancel each other out.
- Two currents in opposite directions tend to open the clearances between assemblies, which can be a source of vibration under certain axial flow conditions.
- Grids are also known which cause flows at the edges which ensure continuity of circulation in the interval between two grids.
- the grids of the document FR-A-2 198 221 ensure, at the center of each assembly, a vortex centered on the axis of the assembly and, in the zones constituted by the corners of four assemblies, a vortex centered on the point junction.
- the document FR 2 093 981 shows assemblies equipped with fins which make it possible to organize the flows according to vortices each centered on the junction point between four adjacent assemblies. In both cases, the ⁇ flows in the assemblies do not have a general direction diagonal to the edges of the grid, but rather a general direction orthogonal to the sides.
- continuity is a simple ⁇ conse quence of the vortex flow, which, unlike the diagonal flow to the edges of the grid in the four segments thereof separated by medians, do not provide a mixture refrigerant streams throughout the assembly, therefore good temperature uniformity.
- the present invention aims in particular to provide a grid with mixing vanes, reducing as far as possible the discontinuities of flow at the interfaces while retaining the advantages of a diagonal flow.
- the invention provides a grid for nuclear fuel assembly, defining a square network of fuel rod receiving cells, formed of assembled plates carrying, at least on one side in the direction of flow, fins of mixing intended to create, in the four sectors of the grid separated by medians of the section of the grid, flows of general direction diagonal to the edges of the grid, the fins of the four sectors being arranged so as to cause flows to the edges of the grid having transverse components which are deduced from each other, from one sector to the next, by rotation of 90 ° around the axis of the grid.
- the four quarters of the grid defined by the medians are deduced from each other by successive rotations of 90 ° around the axis of the grid.
- the invention also provides a nuclear reaction core comprising assemblies provided with such grids, characterized in that the assemblies are arranged so establishing the continuity of the transverse flow components from one assembly to another at the interface between the assemblies.
- FIG. 1A is a detail view of part A of Figure 1;
- FIG. 2 shows the direction of flow transverse to the interfaces between four grids of the kind shown in Figure 1, belonging to mutually adjacent assemblies;
- FIG. 4 similar to FIG. 2, shows the flows transverse to the interface of four assemblies of the kind shown in FIG. 3.
- the grid having the arrangement of fins shown in FIG. 3 may in particular have the material constitution described in the patent application filed on the same day as the present application and having the title "grid for nuclear fuel assembly and plate for such a grid”. to which one can refer ...
- the grid according to the invention can be called "with median network” because it causes a symmetrical transverse flow with respect to a median, requiring within the assembly a change of orientation from 90 ° to the transverse component of the speed of the majority of refrigerant threads.
- guide tubes 12 (fig. 4) only results in the creation of a few flows which close within the same assembly.
- FIGS. 1 and 3 show that the transverse currents, favorable to the mixture of fluid nets, are of the same type for each quarter of each grid. But, when we consider the grid as a whole, we see that the more symmetrical arrangement of the median network is more favorable to mixing than that of the diagonal network.
- the invention is applicable to grids having a number of cells and / or guide tubes different from that which has been shown by way of example.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention concerns a grid with mixing vanes, square in cross-section, comprising at least on one side in the direction of the flow, mixing vanes designed to generate, in the grid four sectors separated by the bisectors of the grid cross-section, flows having a general direction diagonal to the grid edges. The vanes of the four sectors are arranged so as to generate flows at the grid edges with transverse components which are deducted from one another, from one sector to the next, by rotating 90° about the grid axis.
Description
GRILLE A AILETTES MELANGEUSES POUR ASSEMBLAGE DE COMBUSTIBLE NUCLEAIRE GRILLE OF MIXED FINS FOR NUCLEAR FUEL ASSEMBLY
La présente invention concerne les grilles à ailettes mélangeuses destinées aux assemblages de combustible nucléaire, ayant un squelette constitué de deux embouts, de tubes guides reliant les embouts et de grilles portées par ces tubes guides .The present invention relates to grilles with mixing vanes intended for nuclear fuel assemblies, having a skeleton consisting of two end pieces, guide tubes connecting the end pieces and grids carried by these guide tubes.
Ces grilles comportent deux jeux de plaquettes métalli- ques entrecroisées pour délimiter des alvéoles de réception de crayons de combustible, remplacés à certains noeuds du réseau ainsi formé par des tubes guides.These grids include two sets of interleaved metal plates to delimit cells for receiving fuel rods, replaced at certain nodes of the network thus formed by guide tubes.
Certaines au moins des grilles sont munies, généralement sur leur face aval dans le sens de l'écoulement du réfrigé- rant, d'ailettes destinées à provoquer des courants transverses mélangeant les filets de réfrigérant dans l'espace situé en aval des grilles. Certaines au moins des grilles ont pour fonction supplémentaire de maintenir les crayons aux noeuds d'un réseau régulier ou même de les supporter. On a déjà proposé de nombreuses dispositions d'ailettes, destinées à assurer un compromis entre l'homogénéisation de la température des filets fluides, afin de repousser l'apparition de la crise d'ébullition dans le cas des réacteurs à eau sous pression, et la perte de charge imposée au fluide. Les grilles de ce type habituellement utilisées à l'heure actuelle comportent, dans les quatre secteurs de la grille séparés par les médianes de la grille, une disposition qui provoque un écoulement à la sortie de la grille, dont la composante transverse est orientée suivant l'une des diagona- les de la grille, dans des sens alternés.At least some of the grids are provided, generally on their downstream face in the direction of the flow of the refrigerant, with fins intended to cause transverse currents mixing the refrigerant streams in the space situated downstream of the grids. At least some of the grids have the additional function of holding the pencils at the nodes of a regular network or even of supporting them. Numerous fin arrangements have already been proposed, intended to ensure a compromise between the homogenization of the temperature of the fluid nets, in order to postpone the appearance of the boiling crisis in the case of pressurized water reactors, and the pressure drop imposed on the fluid. The grids of this type usually used at present include, in the four sectors of the grid separated by the medians of the grid, a provision which causes a flow at the outlet of the grid, the transverse component of which is oriented along the 'one of the diagonals of the grid, in alternating directions.
A titre d'exemple, la figure 1 montre les directions d'écoulement dans une telle grille à 17x17 alvéoles, prévue pour 25 tubes guides tels que 8, occupant les emplacements indiqués par des cercles. Si l'on considère arbitrairement une ligne ascendante dans la figure comme la direction Nord, on voit que la disposition des ailettes 10 dans le quart Sud-
Est se déduit de la disposition dans le quart Nord-Ouest par une rotation de 180° autour de l'axe de l'assemblage. Les quarts Nord-Est et Sud-Ouest se déduisent également l'un de l'autre par rotation de 180° mais sont différents des deux autres quarts. En effet, la disposition des ailettes dans le quart Nord-Est se déduit de celle dans le quart Nord-Ouest, non pas par une rotation, mais par une translation. Il en est de même pour les dispositions Sud qui se déduisent l'une de l'autre par translation. Les ailettes créent des courants transverses diagonaux, orientés dans le sens des pointes des ailettes comme indiqué par des flèches.By way of example, FIG. 1 shows the directions of flow in such a grid with 17 × 17 cells, provided for 25 guide tubes such as 8, occupying the locations indicated by circles. If we arbitrarily consider an ascending line in the figure as the North direction, we see that the arrangement of the fins 10 in the South quarter East is deduced from the arrangement in the North-West quarter by a rotation of 180 ° around the axis of the assembly. The northeast and southwest quarters are also deduced from each other by 180 ° rotation but are different from the other two quarters. Indeed, the arrangement of the fins in the northeast quarter is deduced from that in the northwest quarter, not by a rotation, but by a translation. It is the same for the Southern arrangements which are deduced from each other by translation. The fins create diagonal transverse currents, oriented in the direction of the tips of the fins as indicated by arrows.
Cette disposition, qui semble a priori très satisfaisante du fait de sa symétrie, présente des inconvénients.This arrangement, which seems a priori very satisfactory because of its symmetry, has drawbacks.
Au sein même d'un assemblage, les courants créés n'ont pas une intensité égale dans le sens radial, notamment du fait que les chemins parcourus ont des longueurs différentes et que les perturbations de l'écoulement sont variables. Les écoulements transverses s'atténuent de façon différente le long de 1 ' écoulement . Enfin, comme le montre la figure 2, les courants transverses dans deux assemblages adjacents sont de sens contraires à l'interface entre assemblages, sauf en ce qui concerne les quelques cellules les plus proches des coins des assemblages. Or deux courants de sens contraire à l'interface tendent à s'annuler. Deux courants de sens opposés tendent à ouvrir les jeux entre assemblages, ce qui peut être source de vibrations dans certaines conditions d'écoulement axial.Even within an assembly, the currents created do not have an equal intensity in the radial direction, in particular because the paths traveled have different lengths and that the disturbances of the flow are variable. The transverse flows attenuate differently along the flow. Finally, as shown in FIG. 2, the transverse currents in two adjacent assemblies are in opposite directions to the interface between assemblies, except as regards the few cells closest to the corners of the assemblies. However, two currents of opposite direction to the interface tend to cancel each other out. Two currents in opposite directions tend to open the clearances between assemblies, which can be a source of vibration under certain axial flow conditions.
On connaît par ailleurs des grilles provoquant des écoulements aux bords qui assurent une continuité de circula- tion dans l'intervalle entre deux grilles. Par exemple les grilles du docoument FR-A-2 198 221 assurent, au centre de chaque assemblage, un vortex centré sur l'axe de l'assemblage et, dans les zones constituées des coins de quatre assemblages, un vortex centré sur le point de jonction. Le document FR 2 093 981 montre des assemblages équipés d'ailettes qui permettent d'organiser les écoulements suivant
des vortex centrés chacun sur le point de jonction entre quatre assemblages adjacents. Dans les deux cas, les écoule¬ ments dans les assemblages n'ont pas une direction générale diagonale par rapport aux bords de la grille, mais plutôt une direction générale orthogonale aux côtés.Grids are also known which cause flows at the edges which ensure continuity of circulation in the interval between two grids. For example, the grids of the document FR-A-2 198 221 ensure, at the center of each assembly, a vortex centered on the axis of the assembly and, in the zones constituted by the corners of four assemblies, a vortex centered on the point junction. The document FR 2 093 981 shows assemblies equipped with fins which make it possible to organize the flows according to vortices each centered on the junction point between four adjacent assemblies. In both cases, the ¬ flows in the assemblies do not have a general direction diagonal to the edges of the grid, but rather a general direction orthogonal to the sides.
Dans les deux cas, la continuité est une simple consé¬ quence de l'écoulement tourbillonnaire, qui, contrairement à des écoulements diagonaux aux bords de la grille dans les quatre secteurs de celle-ci séparées par des médianes, n'assurent pas un mélange des courants de réfrigérant dans l'ensemble de l'assemblage, donc une bonne homogénéité des températures .In both cases, continuity is a simple ¬ conse quence of the vortex flow, which, unlike the diagonal flow to the edges of the grid in the four segments thereof separated by medians, do not provide a mixture refrigerant streams throughout the assembly, therefore good temperature uniformity.
La présente invention vise notamment à fournir une grille à ailettes mélangeuses, réduisant au maximum les discontinui- tés d'écoulement aux interfaces tout en conservant les avantages d'un écoulement diagonal.The present invention aims in particular to provide a grid with mixing vanes, reducing as far as possible the discontinuities of flow at the interfaces while retaining the advantages of a diagonal flow.
Pour cela, l'invention propose une grille pour assemblage de combustible nucléaire, définissant un réseau carré de cellules de réception de crayon de combustible, formée de plaquettes assemblées portant, au moins d'un côté dans le sens de l'écoulement, des ailettes de mélange destinées à créer, dans les quatre secteurs de la grille séparés par des médianes de la section de la grille, des écoulements de direction générale diagonale aux bords de la grille, les ailettes des quatre secteurs étant disposées de façon à provoquer des écoulements aux bords de la grille ayant des composantes transverses qui se déduisent les unes des autres, d'un secteur à la suivante, par rotation de 90° autour de l'axe de la grille. Dans un mode typique de réalisation, les quatre quarts de la grille définis par les médianes se déduisent les uns des autres par des rotations successives de 90° autour de l'axe de la grille.For this, the invention provides a grid for nuclear fuel assembly, defining a square network of fuel rod receiving cells, formed of assembled plates carrying, at least on one side in the direction of flow, fins of mixing intended to create, in the four sectors of the grid separated by medians of the section of the grid, flows of general direction diagonal to the edges of the grid, the fins of the four sectors being arranged so as to cause flows to the edges of the grid having transverse components which are deduced from each other, from one sector to the next, by rotation of 90 ° around the axis of the grid. In a typical embodiment, the four quarters of the grid defined by the medians are deduced from each other by successive rotations of 90 ° around the axis of the grid.
L'invention propose également un coeur de réaction nucléaire comportant des assemblages munis de telles grilles, caractérisé en ce que les assemblages sont disposés de façon
à établir la continuité des composantes transversales d'écoulement d'un assemblage à l'autre à l'interface entre les assemblages.The invention also provides a nuclear reaction core comprising assemblies provided with such grids, characterized in that the assemblies are arranged so establishing the continuity of the transverse flow components from one assembly to another at the interface between the assemblies.
Les caractéristiques ci-dessus, ainsi que d'autres, apparaîtront mieux à la lecture de la description qui suit d'un mode particulier de réalisation de l'invention et de la comparaison qui en est faite avec une grille de type connu. La description se réfère aux dessins qui l'accompagnent, dans lesquels : - la figure 1, déjà mentionnée, est un schéma en vue de dessus montrant la répartition des ailettes dans une grille de mélange, suivant un mode de réalisation fréquemment utilisé à l'heure actuelle ;The above characteristics, as well as others, will appear better on reading the following description of a particular embodiment of the invention and the comparison which is made with a grid of known type. The description refers to the accompanying drawings, in which: - Figure 1, already mentioned, is a diagram in top view showing the distribution of the fins in a mixing grid, according to an embodiment frequently used in actual hour ;
- la figure 1A est une vue de détail de la partie A de la figure 1 ;- Figure 1A is a detail view of part A of Figure 1;
- la figure 2 montre le sens des écoulements transverses aux interfaces entre quatre grilles du genre montré en figure 1, appartenant à des assemblages mutuellement adjacents ;- Figure 2 shows the direction of flow transverse to the interfaces between four grids of the kind shown in Figure 1, belonging to mutually adjacent assemblies;
- la figure 3, similaire à la figure 1, correspond à un mode particulier de réalisation de l'invention ;- Figure 3, similar to Figure 1, corresponds to a particular embodiment of the invention;
- la figure 4, similaire à la figure 2, montre les écoulements transverses à 1 ' interface de quatre assemblages du genre montré en figure 3.FIG. 4, similar to FIG. 2, shows the flows transverse to the interface of four assemblies of the kind shown in FIG. 3.
La grille ayant la disposition d'ailettes montrée en figure 3 peut avoir notamment la constitution matérielle décrite dans la demande de brevet déposée le même jour que la présente demande et ayant pour titre "grille pour assemblage combustible nucléaire et plaquette pour une telle grille" . à laquelle on peut se reporter... La grille suivant l'invention peut être dite "à réseau médian" car elle provoque un écoulement transversal symétrique par rapport à une médiane, imposant à l'intérieur de l'assemblage un changement d'orientation de 90° à la composante transversale de la vitesse de la majorité des filets de réfrigérant.The grid having the arrangement of fins shown in FIG. 3 may in particular have the material constitution described in the patent application filed on the same day as the present application and having the title "grid for nuclear fuel assembly and plate for such a grid". to which one can refer ... The grid according to the invention can be called "with median network" because it causes a symmetrical transverse flow with respect to a median, requiring within the assembly a change of orientation from 90 ° to the transverse component of the speed of the majority of refrigerant threads.
Dans le cas de la figure 3, les quarts Nord-Ouest et Sud-
Est du réseau sont identiques à ceux de la figure 1, mais les quarts Nord-Est et Sud-Ouest sont obtenus par rotation de 90° autour de l'axe de la grille des quarts respectivement Nord- Ouest et Sud-Est. Si cette même modification est appliquée à tous les assemblages, les écoulements à travers les interfaces 12 et 14 deviennent ceux schématisés sur la figure 4. Il y a cette fois continuité des courants transverses aux interfaces . Tout se passe comme si le coeur du secteur était constitué, de ce point de vue, d'un seul assemblage, ce qui supprime les phénomènes vibratoires défavorables apparaissant, pour certaines conditions d'écoulement dans les assemblages équipés de grilles à réseau diagonal d'ailettes.In the case of Figure 3, the northwest and southwest quarters East of the network are identical to those of figure 1, but the North-East and South-West quarters are obtained by rotation of 90 ° around the axis of the grid of the North-West and South-East quarters respectively. If this same modification is applied to all the assemblies, the flows through the interfaces 12 and 14 become those shown diagrammatically in FIG. 4. This time there is continuity of the transverse currents at the interfaces. Everything happens as if the heart of the sector consisted, from this point of view, of a single assembly, which eliminates the unfavorable vibrational phenomena appearing, for certain flow conditions in assemblies equipped with grids with a diagonal network of fins.
La présence de tubes guides 12 (fig.4) n'a pour résultat que de créer quelques écoulements qui se referment au sein d'un même assemblage.The presence of guide tubes 12 (fig. 4) only results in the creation of a few flows which close within the same assembly.
Du point de vue du mélange des filets fluides, les figures 1 et 3 montrent que les courants transverses, favorables au mélange des filets fluides, sont de même type pour chaque quart de chaque grille. Mais, lorsqu'on considère la grille dans son ensemble, on constate que la disposition plus symétrique du réseau médian est plus favorable au mélange que celle du réseau diagonal.From the point of view of the mixture of fluid nets, FIGS. 1 and 3 show that the transverse currents, favorable to the mixture of fluid nets, are of the same type for each quarter of each grid. But, when we consider the grid as a whole, we see that the more symmetrical arrangement of the median network is more favorable to mixing than that of the diagonal network.
L'invention est applicable à des grilles ayant un nombre d'alvéoles et/ou de tubes guides différents de celui qui a été représenté à titre d'exemple.
The invention is applicable to grids having a number of cells and / or guide tubes different from that which has been shown by way of example.
Claims
1. Grille à ailettes mélangeuse, à section carrée, comprenant, au moins d'un côté dans le sens de l'écoulement, des ailettes de mélange destinées à créer, dans les quatre secteurs de la grille séparés par des médianes de la section de la grille, des écoulements qui ont une direction générale diagonale aux bords de la grille, les ailettes des quatre secteurs étant disposées de façon à provoquer des écoulements aux bords de la grille ayant des composantes transverses qui se déduisent les unes des autres, d'un secteur au suivant, par rotation de 90° autour de l'axe de la grille.1. Mixing fin grid, with square section, comprising, at least on one side in the direction of flow, mixing fins intended to create, in the four sectors of the grid separated by medians of the section of the grid, flows which have a general diagonal direction at the edges of the grid, the fins of the four sectors being arranged so as to cause flows at the edges of the grid having transverse components which are deduced from each other, by sector to the next, by rotation of 90 ° around the axis of the grid.
2. Grille selon la revendication 1, caractérisée en ce que les quatre quarts de la grille définis par les médianes se déduisent l'un de l'autre par des rotations successives de 90° .2. Grid according to claim 1, characterized in that the four quarters of the grid defined by the medians are deduced from each other by successive rotations of 90 °.
3. Grille selon la revendication 1 ou 2 , constituée de plaquettes délimitant des cellules dont certaines sont destinées à recevoir des tubes guides (8) . 3. Grid according to claim 1 or 2, consisting of plates delimiting cells, some of which are intended to receive guide tubes (8).
4. Coeur de réacteur nucléaire comportant des assemblages munis de grilles suivant l'une quelconque des revendications précédentes, caractérisé en ce que les assemblages sont disposés de façon à établir la continuité des composantes transversales d'écoulement d'un assemblage à l'autre à l'interface entre les assemblages.4. Nuclear reactor core comprising assemblies provided with grids according to any one of the preceding claims, characterized in that the assemblies are arranged so as to establish the continuity of the transverse flow components from one assembly to the other at the interface between the assemblies.
5. Grille à ailettes mélangeuse selon la revendication 3, à 17x17 alvéoles et prévue pour recevoir 25 tubes-guides, caractérisée parce que ces ailettes présentent la disposition montrée en figure 3.
5. Mixing fin grid according to claim 3, with 17 × 17 cells and designed to receive 25 guide tubes, characterized because these fins have the arrangement shown in FIG. 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR97/08875 | 1997-07-11 | ||
| FR9708875A FR2766002B1 (en) | 1997-07-11 | 1997-07-11 | GRID WITH MIXING FINS FOR NUCLEAR FUEL ASSEMBLY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999003107A1 true WO1999003107A1 (en) | 1999-01-21 |
Family
ID=9509161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1998/001490 WO1999003107A1 (en) | 1997-07-11 | 1998-07-09 | Grid with mixing vanes for nuclear fuel assembly |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2766002B1 (en) |
| WO (1) | WO1999003107A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606369B1 (en) * | 2002-03-06 | 2003-08-12 | Westinghouse Electric Company Llc | Nuclear reactor with improved grid |
| DE102004014499B3 (en) * | 2004-03-25 | 2005-09-01 | Framatome Anp Gmbh | Fuel element for a pressure water nuclear reactor, with a number of fuel rods, has spaced holders in grid cells with flow units to give structured cool water flows |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536256A (en) * | 1966-05-25 | 1968-08-16 | Westinghouse Electric Corp | Assembly of fuel elements for nuclear reactors |
| FR2093981A3 (en) * | 1970-06-02 | 1972-02-04 | United Nuclear Corp | |
| FR2198221A1 (en) * | 1972-08-31 | 1974-03-29 | Exxon Nuclear Co Inc | |
| EP0181264A1 (en) * | 1984-11-05 | 1986-05-14 | Framatome | Spacer grid with mixing vanes for a nuclear fuel assembly |
| EP0656631A1 (en) * | 1993-12-03 | 1995-06-07 | Mitsubishi Nuclear Fuel Co. | Fuel assembly with spaces grids provided with mixing vanes |
-
1997
- 1997-07-11 FR FR9708875A patent/FR2766002B1/en not_active Expired - Fee Related
-
1998
- 1998-07-09 WO PCT/FR1998/001490 patent/WO1999003107A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536256A (en) * | 1966-05-25 | 1968-08-16 | Westinghouse Electric Corp | Assembly of fuel elements for nuclear reactors |
| FR2093981A3 (en) * | 1970-06-02 | 1972-02-04 | United Nuclear Corp | |
| FR2198221A1 (en) * | 1972-08-31 | 1974-03-29 | Exxon Nuclear Co Inc | |
| EP0181264A1 (en) * | 1984-11-05 | 1986-05-14 | Framatome | Spacer grid with mixing vanes for a nuclear fuel assembly |
| EP0656631A1 (en) * | 1993-12-03 | 1995-06-07 | Mitsubishi Nuclear Fuel Co. | Fuel assembly with spaces grids provided with mixing vanes |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2766002B1 (en) | 1999-12-03 |
| FR2766002A1 (en) | 1999-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0181264B1 (en) | Spacer grid with mixing vanes for a nuclear fuel assembly | |
| EP0192534B1 (en) | Device for spacing and supporting fuel rods in a nuclear-fuel assembly | |
| FR2491149A1 (en) | LOBE MIXER FOR GAS TURBINE | |
| DE3835932A1 (en) | DEVICE FOR COOLING AIR SUPPLY FOR GAS TURBINE ROTOR BLADES | |
| JP2003148104A (en) | Blade and rotor assembly for turbine engine | |
| FR3094750A1 (en) | Aircraft turbojet cooling system | |
| WO1999003107A1 (en) | Grid with mixing vanes for nuclear fuel assembly | |
| WO1998057055A1 (en) | Turbofan associated with a thrust reverser with shroud directly mounted in the filament of flow | |
| FR2601075A1 (en) | LOAD TRANSFER STRUCTURE. | |
| FR2677163A1 (en) | THERMOHYDRAULIC GRID AND NUCLEAR COMBUSTIBLE ASSEMBLY HAVING APPLICATION. | |
| EP0349408B1 (en) | Mixing grid with vanes for a nuclear fuel assembly | |
| EP0716219B1 (en) | Segmented stator ring for a turbomachine | |
| US3228853A (en) | Fuel elements for nuclear reactors | |
| US5072579A (en) | Marine vessel thruster | |
| JPH09509744A (en) | Critical power enhancement system for pressurized fuel channel reactor using critical heat flux enhancement appendage | |
| EP0059662A1 (en) | Apparatus for the homogeneous mixing of flowing liquids at different temperatures | |
| JPH06207756A (en) | Vortex tube | |
| Leedjarv et al. | The long-period symbiotic binary CH Cygni | |
| Kohno et al. | Development of the M-V attitude control systems | |
| WO2023275548A1 (en) | An insert for a static mixer, a static mixer including the insert, use of a static mixer, and a method of making an insert for a static mixer | |
| USH1501H (en) | Radial flow nuclear thermal rocket (RFNTR) | |
| US3208917A (en) | Fuel element for a nuclear reactor | |
| Chen et al. | The Th and U abundances in chondritic meteorites | |
| JP3016103B2 (en) | Blade cooling structure | |
| Boldman et al. | Effect of a rotating propeller on the separation angle of attack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN JP US |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
| 122 | Ep: pct application non-entry in european phase | ||
| NENP | Non-entry into the national phase |
Ref country code: JP Ref document number: 1999508272 Format of ref document f/p: F |