WO2021058565A1 - Assemblage de combustible nucléaire muni d'un dispositif de renfort - Google Patents
Assemblage de combustible nucléaire muni d'un dispositif de renfort Download PDFInfo
- Publication number
- WO2021058565A1 WO2021058565A1 PCT/EP2020/076569 EP2020076569W WO2021058565A1 WO 2021058565 A1 WO2021058565 A1 WO 2021058565A1 EP 2020076569 W EP2020076569 W EP 2020076569W WO 2021058565 A1 WO2021058565 A1 WO 2021058565A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nuclear fuel
- reinforcing plate
- reinforcing
- fuel assembly
- guide tubes
- Prior art date
Links
- 239000003758 nuclear fuel Substances 0.000 title claims abstract description 98
- 230000002787 reinforcement Effects 0.000 title abstract description 72
- 230000003014 reinforcing effect Effects 0.000 claims description 240
- 125000006850 spacer group Chemical group 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 4
- 238000005219 brazing Methods 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims description 3
- 210000002105 tongue Anatomy 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
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
-
- 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
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/10—Construction of control elements
-
- 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
- G21C3/34—Spacer grids
- G21C3/352—Spacer grids formed of assembled intersecting strips
-
- 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
- G21C3/34—Spacer grids
- G21C3/356—Spacer grids being provided with fuel element supporting members
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
-
- 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 the field of nuclear fuel assemblies, in particular for pressurized water nuclear reactors (or PWR for “Pressurized Water Reactor”).
- a nuclear fuel assembly for a pressurized water nuclear reactor generally includes a bundle of nuclear fuel rods extending along a longitudinal axis and a support skeleton configured to support the nuclear fuel rods.
- the support skeleton comprises in particular two end pieces spaced apart longitudinally, a plurality of guide tubes extending along the longitudinal axis by connecting the end pieces to one another, and spacer grids distributed along the guide tubes and attached to the guide tubes, each spacer grid being configured to support the nuclear fuel rods.
- Each spacer grid has rod cells traversed by the nuclear fuel rods, each rod cell being traversed by a respective nuclear fuel rod and provided with springs and / or bosses on internal surfaces of the rod cell to maintain transversely and longitudinally the nuclear fuel rod passing through this cell for rod.
- the nuclear fuel assembly In operation, the nuclear fuel assembly is arranged vertically in the core of a nuclear reactor. In this position, the nuclear fuel assembly may tend to flex along its longitudinal axis, and assume a C, S, or W shape.
- Such deformations can pose operational problems, for example for the insertion of control rods inside the guide tubes, and / or maintenance problems, for example for the insertion and / or the extraction of the assembly of nuclear fuel in or out of the nuclear reactor core.
- FR2860334A1 and FR2860335A1 disclose nuclear fuel assemblies provided with reinforcement devices attached to guide tubes of the nuclear fuel assembly, to stiffen the support skeleton and thus limit lateral deformations of the nuclear fuel assembly.
- These reinforcement devices comprise substantially flat plates, plates in the form of an angle or sets of intersecting plates, the plates being fixed on the guide tubes to link them together.
- These reinforcing devices are provided in addition to the spacer grids.
- One of the aims of the invention is to provide a nuclear fuel assembly whose rigidity can be improved while limiting the weight of the nuclear fuel assembly and / or the resistance to the flow of a fluid through it. nuclear fuel assembly.
- the invention provides a nuclear fuel assembly comprising nuclear fuel rods extending along a longitudinal axis and a support skeleton configured to carry the nuclear fuel rods, the support skeleton comprising two end pieces spaced along a longitudinal axis. 'longitudinal axis, a plurality of guide tubes extending along the longitudinal axis and connecting the end pieces to one another, spacer grids distributed between the two end pieces and fixed to the guide tubes, each grid spacer supporting the nuclear fuel rods, the nuclear fuel assembly further comprising at least one reinforcing device, each reinforcing device comprising at least one reinforcing plate, each reinforcing plate being in contact with at least two of the tubes. guides and fixed to one or more of the guide tubes at fixing points, each reinforcing plate having at least two fixing points offset from one of the a utre along the longitudinal axis.
- At least one said reinforcing plate is fixed to a guide tube at two fixing points spaced apart along this guide tube;
- At least one reinforcing plate is fixed only to part of the guide tubes with which this reinforcing plate is in contact;
- At least one reinforcing plate has at least two distinct branches connected together, the at least two branches being each in contact with at least one guide tube at contact points spaced from one another along the longitudinal axis ;
- Each branch of the reinforcing plate has two ends, each end being fixed to a respective guide tube; - The two branches of the reinforcing plate are connected by at least one connection extending between the two branches;
- the assembly includes at least one backing plate having two legs that meet at a junction, each leg extending from the junction away from the other leg;
- the reinforcing device comprises at least one pair of reinforcing plates arranged on either side of a set of guide tubes with which the two reinforcing plates are in contact;
- the reinforcement device comprises several intersecting reinforcing plates
- the reinforcing device comprises several pairs of crossed reinforcing plates
- At least one reinforcing plate is provided with at least one mixing fin and / or at least one deflector and / or at least one movement limiter;
- Each attachment between a reinforcing plate and a guide tube is produced by plastic deformation, in particular by crimping or expanding, by welding and / or by brazing.
- FIG. 1 is a schematic view in elevation of 'a nuclear fuel assembly
- Figure 2 is a sectional view of the nuclear fuel assembly of Figure 2 according to 11-11 in Figure 1
- Figure 3 is a side view illustrating guide tubes and a reinforcement device of the nuclear fuel assembly of Figure 1
- Figure 4 is a top view of the guide tubes and the reinforcement device of Figure 3
- Figure 5 is a perspective view of the reinforcement device of Figures 3 and 4
- Figure 6 is a top view of the guide tubes and of a reinforcing device according to a variant
- Figure 7 is a side view illustrating guide tubes and a reinforcement device of the nuclear fuel assembly of Figure 1 according to a variant
- Figure 8 is a top view of the guide tubes and the reinforcement device of Figure 7
- Figure 9 is a perspective view of some of the guide tubes and the reinforcement device of Figures 7 and 8
- Figures 10 to 12 are side views illustrating each of
- the nuclear fuel assembly 2 of Figure 1 comprises a nuclear fuel rod bundle 4 and a supporting skeleton 6 configured to support the nuclear fuel rods 4.
- the nuclear fuel rods 4 extend parallel to each other and to a longitudinal axis L.
- the longitudinal axis L extends vertically when the nuclear fuel assembly 2 is placed in a core of a nuclear reactor. In operation, a coolant flows vertically from bottom to top through the nuclear fuel assembly 2 as shown by arrow F in Figure 1.
- the support skeleton 6 comprises a lower end piece 8, an upper end piece 10, a plurality of guide tubes 12 and a plurality of spacer grids 14. It optionally comprises an instrumentation tube 13 generally arranged in place of a central guide tube 12, as shown in Figure 2.
- the lower end cap 8 and the top end cap 10 are spaced along the longitudinal axis L.
- the guide tubes 12 are for example metallic.
- the guide tubes 12 extend along the longitudinal axis L and connect the lower end piece 8 and the upper end piece 10 to each other, while maintaining the distance between the lower end piece 8 and the upper end piece 10.
- the rods of nuclear fuel 4 are received between the lower nozzle 8 and the upper nozzle 10.
- Each guide tube 12 is open at its upper end to allow the insertion of a control bar (not shown) inside the guide tube 12, through the upper end 10.
- a control bar allows to control the reactivity of the nuclear reactor core in which the nuclear fuel assembly is inserted 2.
- the spacer grids 14 are distributed along the guide tubes 12 being spaced from each other along the longitudinal axis L. Each spacer grid 14 is rigidly fixed to the guide tubes 12, the guide tubes 12 s 'extending through each spacer grid 14.
- Each spacer grid 14 is configured to support the nuclear fuel rods 4 by maintaining them in a configuration in which they are spaced apart from each other in the transverse direction.
- the nuclear fuel rods 4 are preferably held at the nodes of a substantially regular imaginary network.
- Each spacer grid 14 comprises for example a plurality of rod cells, each rod cell being intended to receive a respective nuclear fuel rod 4, the walls of the rod cell being provided with support elements coming into contact with the fuel rod. outer surface of the nuclear fuel rod 4 to hold it longitudinally and transversely.
- each cell for a pencil comprise for example at least one elastic spring and / or at least one rigid boss, each spring being for example configured to push the nuclear fuel rod 4 into abutment against one or more bosses.
- the nuclear fuel assembly 2 further comprises at least one reinforcement device 20 configured to reinforce the support skeleton 6.
- Each reinforcement device 20 is for example metallic.
- Each reinforcement device 20 is separate from the spacer grids 14. Each reinforcement device 20 is provided in addition to the spacer grids 14.
- Each reinforcement device 20 is disposed between two successive spacer grids 14, between the lower end piece 8 and a spacer grid 14 or between a spacer grid 14 and the upper end piece 10. In FIG. 1, each reinforcement device 20 is located between two successive spacer grids 14.
- each reinforcement device 20 is in contact with several guide tubes 12, being further fixed on one or more of the guide tubes 12 with which it is in contact. This makes it possible to create an additional connection between the guide tubes 12 to which the reinforcing plate 22 is fixed, and thus to stiffen the support skeleton 6, in particular in bending along the longitudinal axis L.
- Each reinforcement device 20 is not attached to the nuclear fuel rods 4. Each reinforcement device 20 does not include any attachment point on a nuclear fuel rod 4.
- Each reinforcement device 20 is configured to allow the passage of nuclear fuel rods 4.
- Each reinforcement device 20 optionally comprises movement limiters 36, for example in the form of rigid bosses, configured to limit the movement of a nuclear fuel rod 4 towards the reinforcement device 20.
- movement limiters 36 are used. visible in Figure 3
- each reinforcement device 20 is disposed inside the bundle of nuclear fuel rods 4.
- each reinforcement device 20 does not extend between a peripheral layer of the nuclear fuel rods 4 and an adjacent layer of the nuclear fuel rods 4.
- each reinforcement device 20 does not extend between the two layers of nuclear fuel rods 4 located outermost of the nuclear fuel rod bundle 4.
- each reinforcing device 20 comprises at least one reinforcing plate 22, each reinforcing plate 22 being in contact with at least two guide tubes 12 and rigidly fixed to one or more tubes. -guides 12 at the fixing points 21.
- Each reinforcing plate 22 is for example metallic.
- Each reinforcing plate 22 has several fixing points 21, located on one or more guide tubes 12.
- Each reinforcing plate 22 is fixed to only one of the guide tubes 12 with which it is in contact or to several among the guide tubes 12 with which it is in contact.
- Each reinforcing plate 22 fixed on several guide tubes 12 is fixed on each of the guide tubes 12 with which the reinforcing plate 22 is in contact or on only part of the guide tubes 12 with which the reinforcing plate 22 is in contact. contact, the reinforcing plate 22 then being in simple contact (without rigid fixing) with at least one of the guide tubes 12 with which it is in contact.
- the fixing between each reinforcing plate 22 and each of the guide tubes 12 to which the reinforcing plate 22 is fixed is carried out by mechanical assembly at the fixing points 21 in order to make the reinforcing device 20 integral with each guide tube 12 to which it is attached. is fixed.
- Mechanical assembly can be direct.
- the mechanical assembly can be indirect by using, for example, a sleeve positioned around the guide tube 12.
- the attachment points 21 are preferably permanent and without a degree of freedom.
- the fixing points 21 can, for example, be produced by plastic deformation (crimping, expanding, etc.), by welding or by brazing. In Figure 3, the attachment points 21 are
- Each reinforcing plate 22 has at least two attachment points 21 which are offset from one another along the longitudinal axis L.
- Two fixing points 21 offset along the longitudinal axis L are for example two fixing points 21 located on the same guide tube 12 and spaced from one another along this guide tube 12, or two points of fixing 21 located on two separate guide tubes 12.
- the reinforcing plate 22 may comprise one or more branches 24.
- Each branch 24 is preferably in contact with at least two guide tubes 12.
- Each branch is in the form of an elongated strip in a direction transverse to the line. 'longitudinal axis L.
- each reinforcing plate 22 has at least one branch 24 in contact with at least two guide tubes 12 and fixed to at least one of the guide tubes 12 with which the branch 24 is in contact.
- Each attachment point 21 of a branch 24 on the guide tubes 12 constitutes an attachment point 21 of the reinforcement plate 22 on the guide tubes 12.
- the reinforcing plate 22 comprises at least one branch 24 which is configured to ensure contact with at least one of the guide tubes 12.
- the reinforcing plate 22 has at least two distinct branches 24 connected together, each branch 24 being in contact with at least two guide tubes 12.
- At least one of the branches 24 is fixed to one of the guide tubes 12 with which it is in contact, and at least one fixing point 21 of the reinforcing plate 22 is located on this branch 24.
- each of the branches 24 is fixed to at least one of the guide tubes 12 on which the reinforcing plate 22 is fixed.
- Each of the branches 24 is therefore provided with at least one fixing point 21.
- At least one of the branches 24 of the reinforcing plate 22 is not fixed to any of the guide tubes 12 on which the reinforcing plate 22 is fixed.
- Such a branch 24 therefore has no fixing point 21.
- each reinforcing plate 22 has two branches 24 parallel to each other and spaced from one another along the longitudinal axis L.
- a reinforcing plate 22 comprises two branches 24 parallel to each other but extending obliquely with respect to the longitudinal axis L, ie neither parallel to the longitudinal axis L nor perpendicular to the longitudinal axis L.
- the reinforcing plate 22 comprises at least one connection 26 extending between the two branches 24 by connecting the two branches 24 together.
- the reinforcing plate 22 preferably comprises several links 26 distributed along the branches 24 being spaced from each other along the branches 24.
- each link 26 extend longitudinally, ie parallel to the longitudinal axis L.
- each link 26 is located at a distance from the ends of at least one of the two branches 24, or even at a distance from the ends of each of the two branches 24, as in the example illustrated in Figures 3 and 5.
- each link 26 is disposed along the branches 24 so as to extend along one of the guide tubes 12 with which the reinforcing plate 22 is in contact.
- each link 26 extends along one of the guide tubes 12 with which the reinforcing plate 22 is in contact.
- each reinforcing plate 22 comprises two links 26 spaced from one another and spaced from the ends of the two branches 24, each link 26 extending along one of the guide tubes 12 with which the reinforcing plate 22 is in contact.
- the reinforcing plate 22 comprises a respective link 26 along each of the guide tubes 12 with which the reinforcing plate 22 is in contact.
- Each reinforcing plate 22 is for example fixed to an assembly 28 comprising several guide tubes 12, here several guide tubes 12 aligned in a direction of alignment perpendicular to the direction of extension of the guide tubes 12, that is to say say perpendicular to the longitudinal axis L.
- the reinforcing plate 22 is fixed to an assembly 28 comprising five guide tubes 12, and comprises two links 26 extending along the second guide tube 12 and the fourth guide tube 12 of set 28.
- each reinforcement plate 22 includes an additional link 26 extending along the first guide tube 12 of the assembly 28, an additional link 26 extending along the third guide tube 12 of the assembly 28 and / or an additional link 26 extending along the fifth guide tube 12 of the assembly 28.
- additional links 26 are shown in phantom in Figure 3.
- the reinforcement device 20 comprises, for example, intersecting reinforcing plates 22.
- At least one reinforcing plate 22 extends in a first direction T 1 and is fixed to a first assembly 28, the guide tubes 12 of the first assembly 28 being aligned in the first direction T1, and at least one other reinforcing plate 22 extends in a second direction T2 making a non-zero angle with the first direction T1 and is fixed to a second assembly 28, the guide tubes 12 of the second assembly 28 being aligned in the second direction T2.
- the second direction T2 is for example perpendicular to the first direction T 1.
- the reinforcement device 20 is for example formed of two sets of intersecting reinforcing plates 22, in particular a first set of reinforcing plates 22 extending in the first direction T1 intersecting with a second set of reinforcing plates 22 extending following the second direction T2.
- the reinforcing plates 22 intersect at a distance from the ends of their branches 24.
- the branches 24 of each reinforcing plate 22 have an end portion extending beyond the crossing with each other plate. reinforcement 22 crossed by the reinforcement plate 22, the end portion being fixed to a guide tube 12.
- each end portion of a branch 24 does not extend beyond its fixing zone on the corresponding guide tube 12.
- the end portions of at least one of the branches 24 of a reinforcing plate 22 extend beyond the peripheral layer of the nuclear fuel rods 4 and are fixed together by a peripheral plate arranged around the nuclear fuel rod bundle 4.
- each reinforcing plate 22 crossing another reinforcing plate 22 is fixed to a guide tube 12 adjacent to this crossing, said other reinforcing plate 22 also being fixed to this guide tube 12.
- the reinforcing plates 22 are for example arranged in pairs 23, the reinforcing plates 22 of each pair 23 being located on either side of a set 28 of guide tubes 12 aligned so that the two reinforcing plates 22 are in contact with opposite faces of the guide tubes 12 of this assembly 28.
- the guide tubes 12 of the assembly 28 are sandwiched between the two reinforcing plates 22 of the pair 23.
- the reinforcement device 20 comprises for example at least one pair 23 of reinforcement plates 22 extending in the first direction T1, intersecting with at least one pair 23 of reinforcement plates 22 extending in the second direction T2, both reinforcing plates 22 of each pair 23 being located on either side of a set 28 of guide tubes 12 to which they are attached.
- the reinforcing device 20 here comprises two pairs 23 of reinforcing plates 22 extending in the first direction T1, intersecting with two pairs 23 of reinforcing plates 22 extending in the second direction T2.
- Each pair 23 of reinforcing plates 22 extending in the first direction T1 cross each pair 23 of reinforcing plates 22 extending in the second direction T2, forming a cell in which is received a guide tube 12 on which each of the reinforcing plates 22 of these two pairs 23 is fixed.
- Each pair 23 of reinforcing plates 22 crossing another pair 23 of reinforcing plates 22 extends beyond this crossing by being in contact with a guide tube 12 located beyond this crossing, in particular fixed to this tube -guide 12.
- End portions of the branch (s) 24 of each pair 23 of backing plates 22 extend beyond the intersection with the backing plates 22 of each other pair 23 of backing plates 22.
- the end portions of the branch (s) 24 of each pair 23 of backing plates 22 extending beyond the intersection with the backing plates 22 of each other pair 23 of backing plates 22 are preferably attached to a guide tube 12.
- the end portions of the or at least one of the branches 24 of a first reinforcing plate 22 are fixed by a transverse connection 27 to the end portions of the branch or branches 24 of a second reinforcing plate. reinforcement 22 of a pair 23.
- a transverse connection 27 is visible in Figure 7.
- said transverse link 27 is in contact and preferably fixed to the guide tube 12 opposite the end portions of the branches 24 concerned.
- These fixings when they exist, constitute fixing points 21 of the reinforcing plate 22 on the guide tubes 12 as described above and thereby fixing points 21 of the reinforcing device 20 on the guide tubes 12.
- the number of pairs 23 of intersecting reinforcing plates 22 may vary. As illustrated in Figure 6, the reinforcing device 20 may for example comprise three pairs 23 of reinforcing plates 22 extending in the first direction T 1 and / or three pairs 23 of reinforcing plates 22 extending in the second. direction T2.
- the reinforcing device 20 comprises three pairs 23 of reinforcing plates 22 extending in the first direction T1, intersecting with three pairs 23 of reinforcing plates 22 extending in the second direction T2.
- the number of pairs 23 of reinforcing plates 22 extending in the first direction T1 and the number of pairs 23 of reinforcing plates 22 extending in the second direction T2 may be different.
- a reinforcing device 20 comprises three pairs 23 of reinforcing plates 22 extending in the first direction T1 intersecting with two pairs 23 of reinforcing plates 22 extending in the second direction T2.
- the reinforcing plates 22 of the reinforcing device 20 are assembled together at their points of intersection.
- the reinforcement device 20 is for example made up of plates, constituting in particular the branches 24, provided with slots obtained for example by stamping and nested together.
- said plates are fixed to one another at their junction, without a degree of freedom (embedding), for example by spot welding or by connection by spider (attached ferrule) at the upper and / or lower edge of the plates and / or welded by a bead weld over all or part of the height of the joint.
- all or part of the reinforcement device 20 can be produced by additive manufacturing.
- the components of the reinforcement device 20 are configured to limit the pressure drop of the reinforcement device 20, for example by using plates whose lower edge is rounded or chamfered.
- each reinforcing plate 22 is provided on one of its edges with at least one fixing tab 30 projecting from said edge, each fixing tab 30 being fixed to a guide tube 12.
- Each fixing tab 30 thus carries an attachment point 21.
- each reinforcing plate 22 is provided with at least one fastening tab 30 associated respectively with each guide tube 12 on which the reinforcing plate 22 is fixed.
- each fixing tongue 30 is disposed on an edge of a branch 24.
- One or more of the branches 24 of the reinforcing plate 22 can each be provided with one or more tongues. fixing 30.
- each fixing tab 30 projects upwardly from the upper edge of the upper branch 24 of each reinforcement plate 22.
- at least one reinforcement plate 22, preferably each. reinforcing plate 22 is provided with mixing means, for example in the form of mixing fins 32 and / or deflectors 34, configured for mixing the cooling fluid flowing between the nuclear fuel rods 4 during operation nuclear reactor.
- the reinforcing plate 22 comprises, for example, mixing fins 32 located on an edge of the reinforcing plate 22, preferably an upper edge of the reinforcing plate 22.
- the mixing fins 32 are for example located on an edge of a branch 24 of the reinforcing plate 22, preferably an upper edge of an upper branch 24 of the reinforcing plate. reinforcement 22.
- the mixing fins 32 are configured to promote mixing of the cooling fluid flowing between the nuclear fuel rods 4 during operation of the nuclear reactor.
- Each mixing fin 32 is preferably inclined relative to the reinforcing plate 22 so as to extend obliquely upwardly relative to the longitudinal axis L.
- the reinforcing plate 22 is for example provided with deflectors 34 arranged on one edge of the reinforcing plate 22.
- the deflectors 34 are for example located on an edge, preferably the upper edge, of a branch 24, preferably the lower branch 24 of the reinforcing plate 22.
- Each deflector 34 is for example made projecting from said edge, in the form of a rectangular projection having at least one corner bent at its free end.
- a baffle 34 is made by slitting one edge of the backing plate 22 and bending at least one of the corners disposed at the free end of the slit.
- the baffles 34 are configured to deflect the coolant flowing between the nuclear fuel rods 4 during operation of the nuclear reactor.
- At least one reinforcing plate 22, preferably each reinforcing plate 22, is provided with movement limiters 36 configured to limit the movement of a nuclear fuel rod 4 adjacent to the reinforcing plate 22 and to avoid any further. contact between the nuclear fuel rod 4 and the reinforcement device 20 and in particular any contact with the mixing means.
- Each movement limiter 36 is for example in the form of a rigid relief forming a support for a nuclear fuel rod 4.
- Each reinforcing plate 22 comprises, for example, movement limiters 36 projecting on one or on each of its two opposite faces.
- the movement limiters 36 are preferably arranged on at least one of the branches 24 of each reinforcing plate 22.
- a reinforcing device 20 comprises at least one reinforcing plate 22 having at least two branches 24 joined at a junction 25, the branches 24 s 'extending from junction 25 away from each other.
- each reinforcing plate 22 has a V-shape composed of two branches 24, each branch 24 defining a respective branch of the V.
- the reinforcing plate 22 is in contact with the guide tubes 12 by being attached to the guide tubes 12 at at least two attachment points 21 offset along the longitudinal axis L.
- the reinforcing plate 22 is fixed to at least one of the guide tubes 12 at two fixing points 21 spaced apart along this guide tube 12, each of these two fixing points 21 being located on a branch 24 respectively.
- At least one of the branches 24 is attached to two guide tubes 12 at two attachment points 21 offset from one another along the longitudinal axis L.
- the reinforcing plate 22 is fixed to guide tubes 12, each branch 24 preferably being fixed to at least one guide tube 12 at attachment points 21 spaced along this guide tube 12. .
- the reinforcing plate 22 is fixed on a guide tube 12 at the junction 25 between the branches 24.
- An attachment point 21 of the reinforcing plate 22 is located at the junction 25 between the branches 24.
- the reinforcement plate 22 is here fixed to a guide tube 12 at the junction 25 between the branches 24, the branches 24 being fixed to several other guide tubes 12 being spaced apart along each of these other guide tubes 12 following the longitudinal axis L.
- the branches 24 are attached to several guide tubes 12, gradually moving apart.
- the spacing between the branches 24 increases between each guide tube 12 and the next along the branches 24.
- each reinforcement plate 22 can be provided with one or more fixing tabs 30, mixing fins 32, deflectors 34 and / or movement limiters 36 on one or more of the branches 24 of the control plate. reinforcement 22, in a manner analogous to what has already been described with reference to Figures 2 to 5.
- each reinforcing device 20 is formed of a pair 23 of reinforcing plates 22 in contact with opposite faces of guide tubes 12, these guide tubes 12 thus being received between the two reinforcing plates 22 of the pair. 23.
- the two reinforcing plates 22 of a pair 23 are also fixed together at at least one of their ends and preferably at each of their ends by transverse links 27, perpendicular to the longitudinal axis L.
- the two reinforcing plates 22 of a pair 23 have similar shapes and are superimposed in a view perpendicular to the longitudinal axis L.
- Each branch 24 of one of the two reinforcing plates 22 of a pair 23 extends along an associated branch 24 of the other reinforcing plate 22 of the pair 23 to together form a branch of the reinforcing device 20 .
- the reinforcing device 20 has a general V shape, each branch of which is formed by two corresponding branches 24 of the two reinforcing plates 22 of the device. reinforcement 20.
- a first reinforcement device 20 is fixed to a first set 28 of guide tubes 12 aligned in a first direction T1 and a second reinforcement device 20 is fixed to a second set 28 of guide tubes 12 aligned along a second direction T2 forming a non-zero angle with the first direction T1, a guide tube 12 being common to the first set 28 of guide tubes 12 and to the second set 28 of guide tubes 12, the two branches 24 of each reinforcing plate 22 of the first reinforcing device 20 being fixed to this common guide tube 12 at fixing points 21 located between the fixing points 21 of the two branches 24 of each reinforcing plate 22 of the second reinforcing device 20.
- the two branches 24 of each reinforcing plate 22 of the first reinforcing device 20 are for example fixed at fixing points 21 remote from each other along the guide tube 12 common to the first set 28 of guide tubes. 12 and the second set 28 of guide tubes 12.
- the nuclear fuel assembly 2 comprises for example a pair of first reinforcement devices 20 extending in the first direction T1 and a pair of second reinforcement devices 20 extending in the second direction T2, the reinforcement devices 20 being arranged so that the branches 24 of each reinforcing plate 22 of each first reinforcing device 20 pass between the branches 24 of each reinforcing plate 22 of one of the second reinforcing devices 20 and on either side of the branches 24 of each reinforcement plate 22 of the other among the second reinforcement devices 20.
- the two reinforcing devices 20 of each pair of reinforcing devices 20 are preferably arranged head-to-tail: the branches 24 of each reinforcing plate 22 of one diverges in one direction along the direction of extension of the two reinforcement devices 20 (first direction T1 or second direction T2) and the branches 24 of each reinforcing plate 22 diverge from one another in the other direction along the direction of extension of the two reinforcement devices 20.
- each reinforcing plate 22 comprises several branches 24, in particular two parallel branches 24 linked by links 26 or two non-parallel branches 24 meeting at a junction 25.
- a reinforcing device 20 comprises a reinforcing plate 22 in the form of a single strip or single branch 24, in contact with several guide tubes 12.
- the reinforcement plate 22 is attached to these guide tubes 12 at attachment points 21 including at least two attachment points 21 offset along the longitudinal axis L.
- the reinforcing plate 22 comprises for example two fixing tabs 30, one located on an upper edge of the reinforcing plate 22 and the other located on a lower edge of the reinforcing plate 22 This makes it possible to ensure the longitudinal offset of the fixing points 21 carried by these fixing tongues 30.
- the two fixing tabs 30 are located at both ends of the reinforcing plate 22, each fixing tab 30 being located at a respective end of the reinforcing plate 22.
- one or each of the two fixing tabs 30 is located. at a distance from the ends of the reinforcing plate 22.
- a fixing tab 30 is located at one end of the reinforcing plate 22, the other fixing tab 30 being closer to the other end of the reinforcing plate 22 while being at a distance from this end.
- each of the two fixing tabs 30 serves for fixing the reinforcing plate 22 on a respective guide tube 12 located at one end of the assembly 28 of the guide tubes 12 aligned with which the guide plate reinforcement 22 is in contact.
- one or each of the two attachment tabs 30 serves for attachment to a guide tube 12 intermediate the alignment of guide tubes 12 with which the backing plate 22 is in contact.
- one of the two fixing tabs 30 serves for fixing to an end guide tube 12, and the other fixing tab 30 serves for fixing an intermediate guide tube 12.
- the reinforcing plate 22 may include other fixing tabs 30.
- the reinforcing plate 22 is inclined so that it extends obliquely with respect to the longitudinal axis L.
- the reinforcing plate 22 is in contact with the guide tubes 12 in contact zones offset from each other along the longitudinal axis L.
- Such an inclination increases the longitudinal offset between two fixing tabs 30 provided on an upper edge and a lower edge of the reinforcing plate 22, at locations spaced apart along the reinforcing plate 22.
- Such an inclination allows a longitudinal offset between two fixing points on two separate guide tubes 12, including when the fixing points are provided on the reinforcing plate 22, between the upper edge and the lower edge of the reinforcing plate 22. , or on fixing tabs 30 located on the same edge of the reinforcing plate 22, for example the upper edge.
- the reinforcing plate 22 is inclined so as to extend obliquely with respect to the longitudinal axis L and is fixed on two guide tubes 12 distinct at two points.
- fixing 21 offset longitudinally, the two fixing points 21 being located between the upper edge and the lower edge of the reinforcing plate 22 or on fastening tabs 30 located on the same edge of the reinforcing plate 22, preferably the upper edge.
- a reinforcing plate 22 comprises two branches 24 including at least one branch 24, here the upper branch 24, inclined so as to be oblique with respect to the longitudinal axis L, being fixed to the guide tubes 12 at fixing points 21 offset longitudinally due to the inclination of the branch 24.
- fixing points 21 are here arranged on fixing tongues 30 located on an upper edge of this branch 24, and could alternatively be located on the branch 24, between its upper edge and its lower edge, or the fixing tongues 30. could be arranged in whole or in part on a lower edge of the branch 24.
- a reinforcing plate 22 comprises parallel branches 24 connected by links 26 or branches 24 joining at a junction 25.
- a reinforcing plate 22 comprises non-parallel branches 24 spaced longitudinally from one another, and connected by at least one link 26.
- a reinforcing plate 22 comprises two branches 24, each branch 24 being fixed to one or more guide tubes 12.
- a reinforcing plate 22 comprises two separate branches 24 in contact with guide tubes 12, only one of the two branches 24 being provided with fixing points 21 on one or more of the guide tubes. guide tubes 12, the other branch 24 having no fixing point 21. This other branch 24 is simply in contact with the guide tubes 12.
- the upper branch 24 is provided with attachment points 21, and the other lower branch 24 has no attachment point 21.
- a reinforcing plate 22 comprises two spaced branches 24 connected by links 26.
- a reinforcing plate 22 comprises an upper branch 24 and a lower branch 24 interconnected by an intermediate branch 24.
- the intermediate branch 24 is in contact with several guide tubes 12.
- the intermediate branch 24 is for example provided with fixing points offset longitudinally.
- the upper branch 24 and the lower branch 24 are parallel, the intermediate branch 24 extends obliquely between the upper branch 24 and the lower branch 24.
- the upper branch 24 and the lower branch 24 here extend perpendicular to the longitudinal axis L, the intermediate branch 24 extending obliquely.
- the inclinations of the branches 24 between themselves and with respect to the longitudinal axis L could be different.
- the upper branch 24 is here provided with fixing points 21 located on fixing tabs 30 arranged on the upper edge of the upper branch 24, the intermediate branch 24 and the lower branch 24 being provided with fixing points 21 located on each of the upper branches. 'them, between its lower edge and its upper edge.
- the attachment points 21 are provided on only one of the branches 24 or only part of the branches 24, and on each branch 24 provided with attachment points 21, the attachment points 21 can be arranged differently on fixing tabs 30 and / or on branch 24, the preceding considerations as to the positions of the fixing points 21 applying to each branch 24.
- each backing plate 22 shown in Figures 10 to 12 can be provided with one or more attachment tabs 30, mixing fins 32, deflectors 34 and / or motion limiters 36 on one or more. their branches 24, in a manner analogous to what has already been described with reference to Figures 2 to 5.
- reinforcing device 20 may of course comprise one or more pairs 23 of similar reinforcing plates 22 sandwiching the guide tubes. 12 and / or other reinforcing plates 22 intersecting with the reinforcing plate 22.
- the reinforcing device 20 comprises reinforcing plates 22 in contact with sets 28 of guide tubes 12 aligned in directions which are perpendicular to the side faces of the assembly. of nuclear fuel 2, which are formed by rows of nuclear fuel rods 4 peripheral to the nuclear fuel assembly 2.
- a reinforcing device 20 comprises at least one reinforcing plate 22 in contact with a set 28 of guide tubes 12 aligned in a direction of oblique alignment with respect to each side face of the nuclear fuel assembly 2. .
- the reinforcing device 20 comprises at least one reinforcing plate 22 in contact with a set 28 of guide tubes 12 aligned in a first direction T1 oblique with respect to each side face of the nuclear fuel assembly 2, and at least one reinforcing plate 22 in contact with a set 28 of guide tubes 12 aligned along a second direction T2 oblique with respect to each lateral face of the nuclear fuel assembly 2, the first direction T1 and the second direction T2 forming a non-zero angle between them, the first direction T1 and the second direction T2 being in particular perpendicular to each other.
- a reinforcing device 20 comprising intersecting reinforcing plates 22 comprises reinforcing plates 22, in particular four reinforcing plates 22, which intersect, defining a individual cell for passage of an instrumentation tube 13.
- One or several attachment points 21 of one or more reinforcing plates 22 defining this individual cell is (are) for example located on the instrumentation tube 13.
- each reinforcing device 20 comprising at least one reinforcing plate 22 in contact with several guide tubes 12 and fixed to at least one of the guide tubes 12 at fixing points 21 offset along the longitudinal axis L makes it possible to bind the guide tubes 12 with satisfactory rigidity due to the offset of the fixing points 21.
- the reinforcement device can thus be produced with reinforcement plates using little material, which makes it possible to reduce its cost and to limit the impact of the reinforcement device on the neutron performance of the fuel assembly and / or the resistance. to the flow of coolant through the nuclear fuel assembly.
- the reinforcement device has been described with reference to a nuclear fuel assembly for a pressurized water reactor of square section.
- the guide tubes of such assemblies are arranged substantially rectilinear in the transverse direction and the reinforcing plates extend perpendicular to the guide tubes in a substantially rectilinear fashion.
- the implementation of the reinforcement device on a nuclear fuel assembly for a pressurized water nuclear reactor of hexagonal section in which the guide tubes are not arranged in a rectilinear manner in the transverse direction can be carried out in a similar manner using plates.
- of reinforcement of geometry adapted to ensure contact of the reinforcement plates with a set of guide tubes.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Fuel-Injection Apparatus (AREA)
- Supports For Pipes And Cables (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20775306.2A EP4035182A1 (fr) | 2019-09-24 | 2020-09-23 | Assemblage de combustible nucléaire muni d'un dispositif de renfort |
KR1020227009787A KR20220098719A (ko) | 2019-09-24 | 2020-09-23 | 강화 장치를 구비하는 핵연료 집합체 |
US17/761,954 US20220328201A1 (en) | 2019-09-24 | 2020-09-23 | Nuclear Fuel Assembly with a Reinforcement Device |
CN202080067114.1A CN114450757A (zh) | 2019-09-24 | 2020-09-23 | 具有加强装置的核燃料组件 |
ZA2022/03399A ZA202203399B (en) | 2019-09-24 | 2022-03-23 | Nuclear fuel assembly with a reinforcement device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1910509A FR3101187B1 (fr) | 2019-09-24 | 2019-09-24 | Assemblage de combustible nucléaire muni d'un dispositif de renfort |
FRFR1910509 | 2019-09-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021058565A1 true WO2021058565A1 (fr) | 2021-04-01 |
Family
ID=69699949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2020/076569 WO2021058565A1 (fr) | 2019-09-24 | 2020-09-23 | Assemblage de combustible nucléaire muni d'un dispositif de renfort |
Country Status (8)
Country | Link |
---|---|
US (1) | US20220328201A1 (fr) |
EP (1) | EP4035182A1 (fr) |
KR (1) | KR20220098719A (fr) |
CN (1) | CN114450757A (fr) |
AR (1) | AR120031A1 (fr) |
FR (1) | FR3101187B1 (fr) |
WO (1) | WO2021058565A1 (fr) |
ZA (1) | ZA202203399B (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114193095A (zh) * | 2021-12-08 | 2022-03-18 | 中核建中核燃料元件有限公司 | 采用局部3d打印结构的核燃料下管座制造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2860335A1 (fr) | 2003-09-30 | 2005-04-01 | Framatome Anp | Assemblage de combustible nucleaire comprenant un dispositif interieur de renfort |
FR2860334A1 (fr) | 2003-09-30 | 2005-04-01 | Framatome Anp | Assemblage de combustible nucleaire comprenant un dispositif maille de renfort et utilisation d'un tel dispositif dans un assemblage de combustible nucleaire |
KR20190089612A (ko) * | 2018-01-23 | 2019-07-31 | 한전원자력연료 주식회사 | 내진성능 향상용 핵연료 골격체 보강 구조물 및 이를 포함하는 핵연료집합체 |
-
2019
- 2019-09-24 FR FR1910509A patent/FR3101187B1/fr active Active
-
2020
- 2020-09-22 AR ARP200102634A patent/AR120031A1/es unknown
- 2020-09-23 CN CN202080067114.1A patent/CN114450757A/zh active Pending
- 2020-09-23 WO PCT/EP2020/076569 patent/WO2021058565A1/fr active Application Filing
- 2020-09-23 US US17/761,954 patent/US20220328201A1/en active Pending
- 2020-09-23 EP EP20775306.2A patent/EP4035182A1/fr active Pending
- 2020-09-23 KR KR1020227009787A patent/KR20220098719A/ko unknown
-
2022
- 2022-03-23 ZA ZA2022/03399A patent/ZA202203399B/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2860335A1 (fr) | 2003-09-30 | 2005-04-01 | Framatome Anp | Assemblage de combustible nucleaire comprenant un dispositif interieur de renfort |
FR2860334A1 (fr) | 2003-09-30 | 2005-04-01 | Framatome Anp | Assemblage de combustible nucleaire comprenant un dispositif maille de renfort et utilisation d'un tel dispositif dans un assemblage de combustible nucleaire |
US20070076840A1 (en) * | 2003-09-30 | 2007-04-05 | Angelo Beati | Nuclear fuel assembly comprising a reinforcing mesh device and the use of one such device in a nuclear fuel assembly |
KR20190089612A (ko) * | 2018-01-23 | 2019-07-31 | 한전원자력연료 주식회사 | 내진성능 향상용 핵연료 골격체 보강 구조물 및 이를 포함하는 핵연료집합체 |
Also Published As
Publication number | Publication date |
---|---|
KR20220098719A (ko) | 2022-07-12 |
FR3101187B1 (fr) | 2021-12-10 |
CN114450757A (zh) | 2022-05-06 |
FR3101187A1 (fr) | 2021-03-26 |
ZA202203399B (en) | 2023-09-27 |
US20220328201A1 (en) | 2022-10-13 |
EP4035182A1 (fr) | 2022-08-03 |
AR120031A1 (es) | 2022-01-26 |
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