WO2017058053A1 - Твэл реактора на быстрых нейтронах - Google Patents
Твэл реактора на быстрых нейтронах Download PDFInfo
- Publication number
- WO2017058053A1 WO2017058053A1 PCT/RU2016/000274 RU2016000274W WO2017058053A1 WO 2017058053 A1 WO2017058053 A1 WO 2017058053A1 RU 2016000274 W RU2016000274 W RU 2016000274W WO 2017058053 A1 WO2017058053 A1 WO 2017058053A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- fuel rod
- tube
- spacing element
- cladding
- 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
- G21C3/336—Spacer elements for fuel rods in the bundle
- G21C3/338—Helicoidal spacer elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C1/00—Reactor types
- G21C1/02—Fast fission reactors, i.e. reactors not using a moderator ; Metal cooled reactors; Fast breeders
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C1/00—Reactor types
- G21C1/02—Fast fission reactors, i.e. reactors not using a moderator ; Metal cooled reactors; Fast breeders
- G21C1/022—Fast fission reactors, i.e. reactors not using a moderator ; Metal cooled reactors; Fast breeders characterised by the design or properties of the core
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/04—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from fissile or breeder material
- G21C15/06—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from fissile or breeder material in fuel elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/28—Selection of specific coolants ; Additions to the reactor coolants, e.g. against moderator corrosion
-
- 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
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/06—Casings; Jackets
- G21C3/12—Means forming part of the element for locating it within the reactor core
-
- 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 invention relates to nuclear engineering and can be used in the manufacture of fuel elements and fuel assemblies for active zones of fast neutron reactors with a liquid metal coolant.
- a fuel rod for the formation of fuel assemblies (hereinafter - fuel assemblies) of fast neutron reactors with a liquid metal coolant.
- a fuel rod includes nuclear fuel placed in an airtight container, which is made in the form of a thin-walled tubular shell made of chrome steel and end caps.
- a fuel rod also includes a spacing element in the form of a wire wound in a spiral with a wide step along its length on the outer surface of the sheath and fixed at the ends of the fuel rod to the sheath or to the plugs.
- the element is designed to form fuel assemblies in the form of a bundle of parallel fuel rods, which are uniformly distributed over the cross section of the fuel assemblies.
- the diameter of the cladding of the fuel rods and the diameter of the pellets, as well as the distance between the claddings of adjacent fuel rods, are of much greater importance in order to ensure optimal characteristics of the active zones of such reactors.
- the outer diameter of the cladding can be more than 10 mm, and the distance between adjacent fuel elements in a fuel assembly is more than 3 mm.
- the use of the known design for BR type fuel elements is associated with the winding of stainless steel wire with a diameter of about 3 mm onto a thin-walled tube.
- Such a fuel rod will significantly increase the fuel consumption of a fuel assembly, which will lead to a deterioration in the neutron-physical characteristics of the reactor core.
- winding with a given interference of a massive wire onto the surface of a thin-walled shell can lead to noticeable distortions of the geometric shape of a fuel element, for example, to its curvature.
- Another disadvantage of this fuel element design is the stiffness of the element distance in the transverse plane of the section. Therefore, the swelling of the fuel and the increase in the diameter of the cladding of the fuel rods during the irradiation of the fuel in the core are not compensated in the transverse plane due to the deformation of the spacing elements. This leads to additional deformation and stresses in the thin-walled cladding of the fuel rods, acceleration of pitting corrosion processes and an increase in the likelihood of a violation of the tightness of the cladding in the zone of its contact with the spacing element.
- a fuel rod for forming fuel assemblies of fast neutrons with a liquid metal coolant, which includes nuclear fuel placed in an airtight container in the form of a thin-walled tubular steel shell and end caps (JPS646791).
- a fuel rod also includes a spacing element in the form of a wire wound in a spiral on the outer surface of the sheath and fixed to the plugs of the fuel rod.
- the element wire along the length of the fuel element is made with a variable diameter - in the lower and upper parts of the fuel element the wire diameter is 1.4 mm, and in the central part of the fuel element the diameter is slightly smaller.
- This embodiment of the element allows to reduce its mechanical effect on the cladding in the central part of the fuel rod, which is subject to increased radiation swelling during irradiation of the fuel.
- the design is not free from the disadvantages of the above analogue, which significantly limits its use for active zones of fast neutron reactors with lead coolant.
- the known design of the fuel rod reduces the lateral rigidity of the Central part of the fuel assembly at the initial phase of burnout, which can lead to a distortion of the cladding of the fuel rods.
- FAs of fast neutron reactors with a liquid metal coolant which includes nuclear fuel placed in an airtight container in the form of a thin-walled tubular steel shell with plugs and a spacing element located on the outer surface of the shell and fixed along the edges of the fuel element (GB 1459562).
- the element is a spring-shaped wire spiral, which in turn is wound in a spiral with a wide pitch on the outer surface of the sheath.
- This design allows you to provide a specified distance between adjacent fuel rods in a fuel assembly with a relatively low metal element.
- an element in a fuel element of this design is made of a relatively thin wire, the length of which is several times the length of the fuel element.
- Known fuel rod for the formation of fuel assemblies for fast neutrons with liquid metal coolant which includes nuclear fuel placed in an airtight container in the form of a thin-walled tubular steel shell and end caps.
- a spacing element is wound in a spiral with a wide pitch, mounted on the plugs of the fuel rod (GB 1450878).
- the element is made in the form of a cable of several (three or more) wires. This design allows you to share the function of the element between several wires and thereby provide the necessary combination of its properties.
- the necessary longitudinal strength of the element and the distance of the spacing of the fuel rods in the fuel assembly is ensured by choosing the number of wires and their diameter.
- the ability of the element to deform in the transverse direction when the fuel swells is provided due to the possibility of displacement of the wires relative to each other and the possibility of local change in the shape of the cross section of the cable in the contact zone with the cladding of adjacent fuel elements.
- the disadvantage of the design is its relatively high metal consumption, the difficulty of securing the cable from several wires to a fuel rod, as well as the increased likelihood of corrosion and destruction of thin wires in a lead coolant.
- Known fuel rod for the formation of fuel assemblies for fast neutrons with liquid metal coolant which includes nuclear fuel placed in an airtight container in the form of a thin-walled tubular steel shell and end caps.
- a spacing element is wound, which is mounted on the plugs of the fuel rod (US3944468).
- the element is made in the form of two interconnected parts - a thin-walled tube and a reinforcing wire placed inside the tube. In this case, only the wire is fixed on the plugs, and the tube is clamped between the wire and the outer surface of the shell in the manufacture of a fuel rod.
- This design allows you to distribute the properties and functions of the distance element between its two component parts and, due to this, provide a given set of its properties.
- the necessary strength of the element in the longitudinal direction is ensured by choosing the diameter of the wire.
- the required spacing of the fuel rods in the fuel assembly is ensured by choosing the outer diameter of the tube.
- the possibility of element deformation and compensation of fuel swelling in the radial direction is provided due to the small thickness of the tube wall.
- the disadvantage of the design is its complexity, relatively high metal consumption, as well as an increased likelihood of accumulation of active impurities from the coolant in a thin gap between the wire and the tube. This significantly increases the likelihood of local overheating zones of the sheath and corrosion centers in the lead coolant in the contact zones of the sheath, wire and tube.
- the objective of the invention is to increase the neutron-physical parameters of the active zone of a fast neutron reactor, as well as improving the operational reliability of fuel rods and fuel assemblies.
- the problem is solved due to the technical result of the invention, which consists in reducing the metal consumption of a fuel element and maintaining its operability during its swelling during operation by reducing the mechanical stresses arising in the cladding of a fuel element under the action of distance elements.
- the essence of the invention lies in the fact that in the fuel rod for a fast neutron reactor (including nuclear fuel, placed in an airtight container in the form of a thin-walled tubular shell made of steel and plugs, a spacing element, wound in a spiral with a wide pitch on the outer surface of the shell and fixed at the ends fuel elements to the cladding and / or plugs; additional parts can also be placed inside the cladding of the fuel element, for example, fuel pellet retainers or inserts from non-fissile materials, metal melt, etc. right) the spacing element is made in the form of a thin-walled tube with a through longitudinal slit along its length and end sections for fixing on a fuel rod.
- the gap is made along the entire length of the tube of the spacing element
- the width of the slit in the tube of the spacing element is set in the range from OD to 0.3 of the outer diameter of the tube;
- the width of the slit in the middle of the tube of the spacing element exceeds the width of the slit at its periphery
- the wall thickness of the tube is set in the range from 0.25 to 1 from the thickness of the cladding of the fuel rod;
- the spacing element is made of the same steel as the cladding of the fuel rod;
- the end sections of the spacing element are made in the form of a scan tube for welding on the outer surface of the shell and / or on the plug;
- one end section of the element is welded to the plug, and the other to the shell;
- the tube of the spacing element is completely or partially filled with metal or alloy, which is used as a coolant in the reactor core, for example, lead.
- the spacing element in accordance with the invention can be made of a thin-walled stainless steel tube, the outer diameter of the tube is equal to the diameter of the spacing element. A longitudinal through cut is made in the tube, a gap of a given width is formed, and end sections are formed for welding with a cladding and / or with fuel plugs.
- This method of manufacturing a distance element is characterized in that:
- a thin-walled tube is made of stainless steel, which is used for the manufacture of the cladding of a fuel rod;
- the formation of the peripheral sections of the element for welding is carried out in the form of fragments of a cylindrical surface, the working diameter of which is equal to the outer diameter of the shell and / or plug;
- the fuel element spacing element in accordance with the invention can also be made of thin stainless steel tape.
- This variant of the manufacturing method of the spacing element is characterized in that:
- the tube of the spacing element is formed from the tape by known methods using matrices or rolls or calibers with a working diameter equal to the outer diameter of the tube of the element;
- the formation of the end sections of the element for welding is carried out by known methods by processing the peripheral sections of the fragments using matrices, rolls or calibers, with a working diameter equal to the outer diameter of the shell and / or plug;
- - forming the tube of the spacing element is carried out using a central rod in the form of a wire whose diameter is equal to the inner diameter of the tube;
- the formation of the middle part of the element is carried out using a central rod in the form of a lead wire, the diameter of which is equal to the inner diameter of the tube;
- the tape is made of steel for the cladding of a fuel rod; - the tape is formed from the cladding of a fuel rod by cutting it into longitudinal fragments of a fixed length and width and additional processing, for example, rolling.
- Figure 1 shows the cross section of a fuel element with a spacing element in the form of a thin-walled tube with a longitudinal gap.
- Figure 2 shows the cross section of a fuel element with a spacing element in the form of a thin-walled tube with a longitudinal slit that is completely or partially filled with a coolant material, for example, lead.
- Figure 3 shows the end portion of a fuel element with a spacing element welded to the cladding.
- FIG. 4 is a diagram illustrating the cutting of a longitudinal fragment for manufacturing a spacing element from a pipe for a fuel cladding in accordance with a second embodiment of the method.
- FIG. 5 is a diagram of forming a spacing element in accordance with a second embodiment of the method, a) without using an insert, c) using an insert in the form of a lead wire.
- FIG. 6 shows a General view of the spacing element.
- a fuel rod (1) in accordance with one possible embodiment of the invention includes a thin-walled shell (2), which is sealed at the ends with plugs (3).
- a spacing element (4) which includes a tube (5) with a longitudinal slot (6), end sections (7) and a transition section (8), is wound in a spiral with a large step on the outer surface of the shell (2). The edge (9) of the end portion (7) is welded to the shell (2).
- Nuclear fuel (10) is placed inside the shell (2), as well as, if necessary, other parts and materials, for example, fuel retainers, elements from inactive materials, metal melts and others (not shown).
- a material (11) of a heat carrier, for example, lead, which in the form of a wire is included in the composition of the spacing element during its manufacture, can be placed inside the tube (5).
- the design of the fuel element (1) provides compensation for the radiation swelling of the shells in the reactor core due to the compressibility and deformation of the tube (5) made with a slit (6) with a width of 0.1 to 0.3 of the outer diameter of the tube (5). At This deformation of the tube (5) in the transverse direction within the gap width does not lead to a significant increase in contact stresses in the shell (2), which increases its reliability at high burnups of fuel.
- such a design of a fuel element (1) with a longitudinal slot (6) of the indicated width allows the coolant to enter and exit the coolant in the tube (5) both in the longitudinal and transverse directions.
- the width of the slit (6) can be different and in the middle part of the tube (5) can have a slightly greater value than on its periphery. This embodiment allows you to optimize the stability of the geometric shape and rigidity of the fuel assembly design.
- the wall thickness of the tube (5) and the end sections (7) of the spacing element is set in the range from 0.25 to 1 from the thickness of the cladding (2) of the fuel rod .
- the indicated value of the wall thickness of the element (4) and its implementation from the same steel as the cladding (2) of the fuel rod contributes to the formation of optimal conditions for ensuring the strength and reliability of welded joints between the end sections (7) and the cladding (2) and / or plugs ( 3).
- the end sections (7) can be welded to the shell (2) or to the plugs (3) or one end section (7) is welded to the plug (3), and another to the shell (2).
- the value of the width of the slit (6) can be formed not only by the width by performing bends inside the edges (16) of the tube (5). Such bends (16) increase the stability of the shape of the element (4) ⁇ spacing in the manufacturing process of a fuel rod.
- a fuel rod (1) can be made with an element (4), a tube (5) which is completely or partially filled with material (11) of a coolant, for example, lead.
- a coolant for example, lead.
- This embodiment allows to provide increased strength and rigidity of the fuel rod and fuel assembly based on it during the formation of the reactor core on fast neutrons. In this case, during the start-up of the reactor and the entry of hot coolant into its core, lead (11) in the tube (5) melts and passes into the composition of the coolant.
- the design of the spacing element for a fuel element in accordance with the invention and the method of manufacturing the spacing element are illustrated in the figures of FIG. 4, FIG. 5 and 6.
- FIG. Figure 4 shows a general view of the workpiece (12), which, after placement with a wide step on the outer surface of the cladding (2) and fixing, forms a spacer element (4) of the fuel element.
- the workpiece is made in the form of a thin-walled tube (5) and end sections (7) in the form of a fragment of a cylindrical shell with an inner diameter for welding with a shell (2) or with a plug (3).
- the tube (5) and end sections (7) are connected by transition sections (13), the shape of which provides coupling for welding of the end sections (7) to the shell (2) or plug (3).
- the end sections (7) may include technological sections (not shown), which are used, in particular, when winding the billet on the cladding of a fuel rod, and after fixing the spacing element (4) are removed.
- the ratio of the sizes of the elements of the workpiece, the characteristics of the material for its manufacture are given above when describing the element (4) in the construction of a fuel element in accordance with the invention.
- the tube (5) can be completely or partially filled with material (11) of a heat carrier, for example, lead.
- the workpiece (12) is formed from a thin-walled tube, in the shell of which a through cut is made with the formation of a longitudinal slit (6) of a given width.
- the value of the width of the slit (6) can be formed not only by the width by performing bends inside the edges (16) of the tube (5). Such bends (16) increase the stability of the shape of the spacing element (4) during the manufacture of a fuel rod.
- the outer diameter of the thin-walled tube is equal to the diameter of the tube (5) of the element.
- the end sections (7) of the element (4) are formed for welding in the form of fragments of a cylindrical surface, the diameter of which is equal to the outer diameter of the shell and / or plug.
- a thin-walled tube is made of stainless steel, which is used for the manufacture of the cladding of a fuel rod.
- a heat-transfer material for example, by pouring lead with a melt.
- the length of the workpiece (12) is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the workpiece (12) onto the cladding (2) during the formation of the element (4) of the fuel element.
- the spacing element is formed from a thin stainless steel tape.
- the most appropriate is the implementation of the tape of steel, which is used for the cladding of a fuel rod.
- Such steel has high corrosion resistance in a metal coolant, for example, in lead.
- the tape can be obtained from pipes obtained by the technology for the manufacture of cladding of fuel elements. For this, for example, you can cut the pipe (15) into longitudinal fragments (14) of a fixed length and width, and perform (for example, to reduce the thickness) additional processing of the fragment (for example, rolling).
- the pipe (15) is either identical to the pipes for the manufacture of the cladding of a fuel rod, or is a pipe obtained as a result of some additional processing of the pipe for the cladding, for example, in order to reduce its thickness.
- the method includes molding (folding) the obtained fragment (14) in the form of a tube (5) with a through longitudinal slot (6) of a given width with end sections (7) for welding with a cladding (2) or plugs (3) of a fuel element.
- the length of the workpiece (12) is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the workpiece (12) onto the cladding (2) during the formation of the element (4) of the fuel element. If the longitudinal fragment (12) is subjected to rolling before the formation of the element (4), then the initial length and width of the fragment is chosen taking into account the increase in its size during rolling.
- the tube (5) is formed by any known method, for example, by folding a fragment (14) when it is dragged through an external gauge or by crimping it (folding) by forming rolls.
- the working diameter of the forming devices is set equal to the outer diameter of the tube (5).
- the formation of the width of the slit (6) is carried out by calculating the length of the arc of the fragment (14) depending on the diameter of the tube (5).
- An exact calibration of the width of the slit (6) can be carried out by forming bends (16) on the side of one or two edges of the slit (6).
- the excess part of the circumference of the tube (5) can be removed during calibration of the slit (6) during the molding of the workpiece (12).
- peripheral sections (7) of the workpiece for welding is carried out, for example, by using a mandrel whose working diameter is equal to the outer diameter of the shell (2) or corresponds to the geometric dimensions of the plug (3).
- the tubular part of the workpiece is molded using a central rod in the form of a wire (11), the diameter of which is equal to the inner diameter of the tube (5).
- a lead wire (11) is used, the diameter of which is equal to the inner diameter of the tube (5).
- calibrate the width of the slit (6) in the tube (5) In accordance with the first and second variants of the method of manufacturing a spacing element during the molding of the workpiece (12) using a die or mandrel, calibrate the width of the slit (6) in the tube (5). In accordance with one particular variant of the method, such calibration involves the formation of an increased slit width (6) in the middle of the workpiece (12) to take into account the unevenness of fuel swelling during irradiation along the height of the fuel rod.
- a spacing element (4) is made with an outer diameter of the tube (5) of 4 mm for a fuel element with an outer diameter of the shell of 12 mm and its thickness of 0.5 mm.
- the shell (2) is made of steel with high corrosion resistance in a lead coolant medium.
- a thin-walled stainless steel tube with an outer diameter of 4 mm and a wall thickness of 0.3 mm i.e., equal to 0.6 of the thickness of the cladding of a fuel rod
- the length of the thin-walled tube is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the element (4) onto the cladding of the fuel element (1).
- a longitudinal through cut is made of a width of 1 mm (i.e., 0.25 from the outer diameter of the thin-walled tube) with the formation of the tubular part (5) and the slit (6) of the element (4).
- end sections (7) are formed in the form of a reamer of a thin-walled tube for welding with a cladding (2) or plugs (3) of a fuel element in the form of fragments of a cylindrical surface with a radius equal to the cladding radius (2), i.e. - 12 mm.
- Example 2 A spacer element (4) is made for a fuel rod with the dimensions given in Example 1.
- a thin-walled tube with the dimensions shown in Example 1 is made of stainless steel with an outer diameter of 4 mm and a wall thickness of 0.3 mm (i.e. equal to 0.6 of the thickness of the cladding of a fuel rod).
- a longitudinal through cut is made with a width of 0.4 mm.
- a final slit width (6) is formed of 1.2 mm, i.e. 0.3 of the outer diameter of the thin-walled tube.
- end sections (7) are formed in the form of a reamer of a thin-walled tube for welding with a cladding (2) or plugs (3) of a fuel element in the form of fragments of a cylindrical surface with a radius equal to the cladding radius (2), i.e. - 12 mm.
- Example 3 An element is made (12) for a fuel element with an outer diameter of the shell 12 mm, its thickness 0.5 mm and with an outer diameter of the tube (5) equal to 4 mm.
- the shell is made of steel with high corrosion resistance in a lead coolant medium.
- a pipe (15) is used whose diameter, wall thickness and material are identical to the tubes for the manufacture of the fuel cladding, i.e. with an outer diameter of the shell of 12 mm and a thickness of 0.5 mm.
- the length of the pipe (15) for obtaining fragments (14) and billets (12) is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the element (4) onto the cladding of the fuel element (1).
- the excess part of the circumference of the tube (5) which in the case under consideration is 0.44 mm, can be compensated by forming bends (16) directed inside the tube (5) from the side of one or two edges of the slit (6).
- the indicated excess portion of the circumference of the tube (5) can be removed during calibration of the slit (6) during the molding of the workpiece (12).
- the end sections (7) are molded for welding with the shell (2) in the form of fragments of a cylindrical surface with a radius equal to the radius of the shell (2), i.e. 12 mm.
- Example 4 An element is made (12) for a fuel rod with the dimensions given in Example 1 (outer diameter of the cladding is 12 mm, its thickness is 0.5 mm and with the outer diameter of the tube (5) is 4 mm).
- a pipe (15) is used whose diameter, wall thickness and material are identical to the pipes for the manufacture of the fuel cladding.
- Three fragments (14) with an arc length of 12 mm are made as in Example 1. From the obtained fragments (14), preforms (12) are formed with the outer diameter of the tube (5) is 4 mm and the width of the slit (6) is 0.25 of the outer diameter of the tube (5), which is 1 mm.
- the formation of the tube (5) is carried out using lead wire (11) with a diameter of 3 mm, which is previously placed in the center of the workpiece (12) for the length of its tube (5).
- Example 5 An element is made (12) for a fuel rod with the dimensions given in example 1 (outer diameter of the sheath is 12 mm, its thickness is 0.5 mm and with the outer diameter of the tube (5) equal to 4 mm).
- a pipe (15) with a wall thickness of 0.6 of the thickness of the sheath shell is used, i.e. equal to 0.3 mm.
- the pipe (15) was obtained by additional thermomechanical processing of the tube for the manufacture of the cladding of a fuel rod.
- the length of the pipe (15) for obtaining fragments (14) and preforms (12) is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the element (4) onto the cladding of the fuel element (1).
- the pipe (15) is cut into longitudinal fragments (14) with an arc length of 12 mm.
- preforms (12) are formed with an outer tube diameter (5) of 4 mm and a slit width (6) of 1 mm, which is 0.25 of the outer diameter of the tube (5).
- the preform (12) is formed as in Example 1. If the preform (12) is formed as in Example 2, lead wire (11) with a diameter of 3.4 mm is used.
- Example 6 a workpiece (12) is manufactured for the fuel element spacing element (4) with the dimensions given in Example 1 (outer diameter of the cladding is 12 mm, its thickness is 0.5 mm and with the outer diameter of the tube (5) - 4 mm).
- a thin-walled stainless steel tube with an outer diameter of 4 mm and a wall thickness of 0.3 mm (i.e., 0.6 of the thickness of the cladding of a fuel rod) is obtained.
- a longitudinal through cut is made of a width of 1 mm (i.e., 0.25 from the outer diameter of the thin-walled tube) with the formation of the tubular part (5) and the slit (6) of the element (4).
- the end sections (7) are formed in the form of a scan of a thin-walled tube for welding with a shell (2) or caps (3) of a tulle in the form of fragments of a cylindrical surface with a radius equal to the radius of the shell (2), i.e. - 12 mm.
- Example 7 An element (12) is made for a tulle with an outer diameter of the shell of 12 mm, a shell thickness of 0.5 mm and an outer diameter of the tube (5) of 4 mm.
- the shell is made of steel with high corrosion resistance in a lead coolant medium.
- a spacing element (4) is made with an outer diameter of the tube (5) of 4 mm for a fuel rod with an outer diameter of the shell of 12 mm and its thickness of 0.5 mm.
- the shell (2) is made of steel with high corrosion resistance in a lead coolant medium.
- a thin-walled stainless steel tube with an outer diameter of 4 mm and a wall thickness of 0.3 mm i.e., equal to 0.6 of the thickness of the cladding of a fuel rod
- the length of the thin-walled tube is determined taking into account the length and diameter of the cladding (2) of the fuel element, as well as the specified step of winding the element (4) onto the cladding of the fuel element (1).
- a thin-walled tube is filled with a coolant melt in the core of an atomic reactor, for example, with a lead melt. After cooling the tube, a longitudinal through cut of 1 mm wide (i.e., 0.25 of the outer diameter of the thin-walled tube) is performed along its entire length with the formation of the tubular part (5) and the slit (6) of the element (4).
- end sections (7) are formed in the form of a reamer of a thin-walled tube for welding with a cladding (2) or plugs (3) of a fuel element in the form of fragments of a cylindrical surface with a radius equal to the cladding radius (2), i.e. - 12 mm.
- the proposed design can significantly reduce the metal consumption of the fuel rod due to the implementation of the spacing element in the form of a thin-walled tube.
- a through longitudinal slot in the tube of the spacing element can significantly increase the possibility of its deformation in the transverse plane and reduce local stresses arising in the cladding of a fuel rod when fuel burns out in the reactor core.
- Achievement of the indicated technical results contributes to an increase in the neutron-physical parameters of the fast neutron reactor core and to an increase in the operational reliability of fuel rods and fuel assemblies.
- the technical solution can significantly reduce the rigidity of the spacing element in the longitudinal direction. This makes it possible to wind the blank of the spacing element with a given interference on the surface of a thin-walled shell without noticeable distortions in the geometric shape of the fuel element.
- the proposed design allows for high reliability of the welded joints of the spacing element and the shell due to the homogeneous composition, structure and geometric shape of the welded fragments.
- the indicated properties of the technical solution suggest the possibility of its practical application in the manufacture of fuel rods and fuel assemblies for fast neutron reactors, for example, with lead coolant.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16852161.5A EP3358571B1 (en) | 2015-09-30 | 2016-05-05 | Fast neutron reactor fuel rod |
JP2018537609A JP6612460B2 (ja) | 2015-09-30 | 2016-05-05 | 高速中性子炉の燃料棒および燃料棒の製造方法 |
CN201680070141.8A CN108292532B (zh) | 2015-09-30 | 2016-05-05 | 快中子反应堆燃料棒 |
US15/764,798 US20180286523A1 (en) | 2015-09-30 | 2016-05-05 | Fast neutron reactor fuel rod |
KR1020187012202A KR102106796B1 (ko) | 2015-09-30 | 2016-05-05 | 고속 중성자로 연료봉 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2015141674/07A RU2598542C1 (ru) | 2015-09-30 | 2015-09-30 | Твэл реактора на быстрых нейтронах, элемент дистанционирования твэла и способ (варианты) изготовления элемента |
RU2015141674 | 2015-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017058053A1 true WO2017058053A1 (ru) | 2017-04-06 |
Family
ID=57018407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/RU2016/000274 WO2017058053A1 (ru) | 2015-09-30 | 2016-05-05 | Твэл реактора на быстрых нейтронах |
Country Status (7)
Country | Link |
---|---|
US (1) | US20180286523A1 (ru) |
EP (1) | EP3358571B1 (ru) |
JP (1) | JP6612460B2 (ru) |
KR (1) | KR102106796B1 (ru) |
CN (1) | CN108292532B (ru) |
RU (1) | RU2598542C1 (ru) |
WO (1) | WO2017058053A1 (ru) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2646597C1 (ru) * | 2016-09-05 | 2018-03-06 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" - Госкорпорация "Росатом" | Твэл реактора на быстрых нейтронах |
US10770188B2 (en) * | 2016-12-26 | 2020-09-08 | State Atomic Energy Corporation “Rosatom” On Behalf Of The Russian Federation | Nuclear reactor fuel assembly and method for producing same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2059139A5 (en) | 1969-08-25 | 1971-05-28 | North American Rockwell | Spacer for parallel fuel rods |
US3944468A (en) * | 1973-02-19 | 1976-03-16 | Commissariat A L'energie Atomique | Fuel pin cluster for a high-power reactor |
GB1450878A (en) * | 1974-09-11 | 1976-09-29 | Kurilkin Vv | Nuclear reactor fuel assembly |
GB1459562A (en) * | 1974-03-07 | 1976-12-22 | Atomic Energy Authority Uk | Nuclear reactor fuel elements |
RU2543609C1 (ru) * | 2013-12-24 | 2015-03-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МЭИ" | Интенсификатор теплоотдачи |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB754265A (en) * | 1954-04-27 | 1956-08-08 | Douglas Arnold Coates | Improvements in or relating to burners for fuel gases of the aerated, or bunsen, type |
JPS5810096U (ja) * | 1981-07-15 | 1983-01-22 | 株式会社日立製作所 | 核燃料集合体 |
JPS58142292A (ja) * | 1982-02-19 | 1983-08-24 | 株式会社日立製作所 | 燃料棒 |
JPS59184884A (ja) * | 1983-04-06 | 1984-10-20 | 株式会社東芝 | 核燃料集合体 |
GB8805365D0 (en) * | 1988-03-07 | 1988-04-07 | Atomic Energy Authority Uk | Nuclear reactor fuel elements |
JP2512797B2 (ja) * | 1989-01-20 | 1996-07-03 | 日本ニユクリア・フユエル株式会社 | スペ―サワイヤ巻端処理装置 |
JP4084174B2 (ja) * | 2002-12-10 | 2008-04-30 | 松下電器産業株式会社 | 熱交換器 |
RU2340019C1 (ru) * | 2007-04-27 | 2008-11-27 | Федеральное Государственное Унитарное Предприятие "Научно-Исследовательский И Конструкторский Институт Энерготехники Имени Н.А. Доллежаля" | Тепловыделяющая сборка ядерного реактора |
CN201242873Y (zh) * | 2008-08-06 | 2009-05-20 | 中国原子能科学研究院 | 钠冷快堆的燃料组件模拟件 |
US9576685B2 (en) * | 2012-04-26 | 2017-02-21 | Ge-Hitachi Nuclear Energy Americas Llc | Fuel bundle for a liquid metal cooled nuclear reactor |
CN102810338B (zh) * | 2012-08-17 | 2015-03-11 | 中国原子能科学研究院 | 一种钠冷快堆钠空泡反应性的测量方法 |
-
2015
- 2015-09-30 RU RU2015141674/07A patent/RU2598542C1/ru active
-
2016
- 2016-05-05 WO PCT/RU2016/000274 patent/WO2017058053A1/ru active Application Filing
- 2016-05-05 EP EP16852161.5A patent/EP3358571B1/en active Active
- 2016-05-05 JP JP2018537609A patent/JP6612460B2/ja not_active Expired - Fee Related
- 2016-05-05 KR KR1020187012202A patent/KR102106796B1/ko active IP Right Grant
- 2016-05-05 CN CN201680070141.8A patent/CN108292532B/zh active Active
- 2016-05-05 US US15/764,798 patent/US20180286523A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2059139A5 (en) | 1969-08-25 | 1971-05-28 | North American Rockwell | Spacer for parallel fuel rods |
US3944468A (en) * | 1973-02-19 | 1976-03-16 | Commissariat A L'energie Atomique | Fuel pin cluster for a high-power reactor |
GB1459562A (en) * | 1974-03-07 | 1976-12-22 | Atomic Energy Authority Uk | Nuclear reactor fuel elements |
GB1450878A (en) * | 1974-09-11 | 1976-09-29 | Kurilkin Vv | Nuclear reactor fuel assembly |
RU2543609C1 (ru) * | 2013-12-24 | 2015-03-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МЭИ" | Интенсификатор теплоотдачи |
Also Published As
Publication number | Publication date |
---|---|
KR102106796B1 (ko) | 2020-05-06 |
CN108292532B (zh) | 2022-02-25 |
KR20180086186A (ko) | 2018-07-30 |
JP6612460B2 (ja) | 2019-11-27 |
EP3358571A1 (en) | 2018-08-08 |
EP3358571B1 (en) | 2020-07-15 |
CN108292532A (zh) | 2018-07-17 |
JP2018534590A (ja) | 2018-11-22 |
EP3358571A4 (en) | 2019-07-24 |
RU2598542C1 (ru) | 2016-09-27 |
US20180286523A1 (en) | 2018-10-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2551432C1 (ru) | Оболочка для тепловыделяющего элемента, тепловыделяющий элемент и тепловыделяющая сборка | |
RU2598542C1 (ru) | Твэл реактора на быстрых нейтронах, элемент дистанционирования твэла и способ (варианты) изготовления элемента | |
US10112224B2 (en) | Cladding tube for nuclear fuel rod, method and apparatus for manufacturing a cladding | |
KR101007848B1 (ko) | 환형마개가 형성된 이중냉각 핵연료봉과 이를 제작하는 핵연료봉 제조방법 | |
EP3509072B1 (en) | Fast-neutron reactor fuel rod | |
RU2647707C1 (ru) | Тепловыделяющая сборка ядерного реактора и способ ее изготовления | |
US10770188B2 (en) | Nuclear reactor fuel assembly and method for producing same | |
RU2651263C1 (ru) | Тепловыделяющая сборка и способ ее изготовления | |
US3356584A (en) | Fuel pellet for nuclear reactor | |
US3118222A (en) | Processes for sheathing the fuel elements of nuclear reactors |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16852161 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15764798 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2018537609 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20187012202 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2016852161 Country of ref document: EP |