WO1995024718A1 - Grille d'ecartement des crayons combustibles contenant du combustible nucleaire dans un element combustible de reacteur nucleaire - Google Patents

Grille d'ecartement des crayons combustibles contenant du combustible nucleaire dans un element combustible de reacteur nucleaire Download PDF

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Publication number
WO1995024718A1
WO1995024718A1 PCT/DE1995/000214 DE9500214W WO9524718A1 WO 1995024718 A1 WO1995024718 A1 WO 1995024718A1 DE 9500214 W DE9500214 W DE 9500214W WO 9524718 A1 WO9524718 A1 WO 9524718A1
Authority
WO
WIPO (PCT)
Prior art keywords
mesh
fuel
outer edge
corner
tongue
Prior art date
Application number
PCT/DE1995/000214
Other languages
German (de)
English (en)
Inventor
Alexander Steinke
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1995024718A1 publication Critical patent/WO1995024718A1/fr

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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
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • G21C3/332—Supports for spacer grids
    • 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 a spacer grid for fuel rods of a nuclear reactor fuel element containing nuclear fuel according to patent claim 1.
  • a nuclear reactor fuel element which is intended for a pressurized water nuclear reactor, has a plurality of control rod guide tubes as rod-shaped bodies which are guided through the guide sleeves of the spacer grids.
  • These control rod guide tubes are attached at one end to a fuel element head and at the other end to a fuel element foot.
  • the spacer grids are located between the fuel assembly head and the fuel assembly foot and, viewed in the longitudinal direction of the nuclear reactor fuel assembly, are arranged next to one another at a distance from one another.
  • the control rod guide tubes are guided through the meshes of the spacer grids, but also the fuel rods containing nuclear fuel, which are neither attached to the fuel element head nor to the fuel element foot.
  • control rod guide tubes are generally attached to the guide sleeves in a form-fitting manner, the fuel rods in the individual meshes of the spacer grids are non-positively held with the aid of springs which press the fuel rods against rigid knobs on the mesh walls of the spacer grids.
  • the tongue drawn outwards at the sleeve end of the guide sleeve and fastened with its tongue edges to the inclined outer edge section of each of the two mesh walls of a stitch of the spacer grid according to the invention stiffens this spacer grid and the connection between the spacer grid and the guide sleeve to a particular degree. Lateral transverse forces that act on the fuel element head and While the nuclear reactor fuel element, which is firmly held in the element base, causes a lateral deflection path of the control discharge pipes together with the spacer grids and the fuel rods, these parts also assume their original shape again after the lateral forces have been eliminated or reversed.
  • Claims 2 to 4 are directed to advantageous further developments of the spacer grid according to the invention.
  • FIG. 1 schematically shows the side view of a nuclear reactor fuel element which is intended for a pressurized water nuclear reactor.
  • FIG. 2 shows an exploded view of a plan view of a spacer grid according to the invention of the nuclear reactor fuel element according to FIG. 1.
  • FIG. 3 shows a top view of the spacer grid according to FIG. 2 in the assembled state.
  • FIG. 4 shows the nuclear reactor fuel element according to FIG. 1 in a side view and in a deformed state.
  • the nuclear reactor fuel element according to FIG. 1 has a fuel element head 2 and a fuel element foot 3. Between focal element head 2 and fuel element foot 3, a control rod guide tube 4 can be seen.
  • This control rod guide tube is rigidly attached, for example screwed, at one end to the fuel assembly head 2 and at the other end to the fuel assembly foot 3.
  • FIG. 1 a number of spacer grids 5 can be seen in FIG. Both the fuel assembly head 2 and the fuel assembly foot 3 have also seen a distance from the spacer grids 5 in the direction of the longitudinal axis 6.
  • a guide sleeve 15 is rigidly attached to both the top and bottom of each spacer grating 5.
  • the control rod guide tube 4 extends through these two guide sleeves 15 on each of the spacer grids 5, and the control rod guide tube 4 is rigidly attached to each of these guide sleeves 15 by welding points.
  • the attachment of the control tube 4 to the guide sleeves 15 can also be positive.
  • a fuel rod 8 filled with nuclear fuel is guided through a large part of the grid meshes of each of the spacer grids 5.
  • This fuel rod 8 has a distance from the fuel element head 2 or fuel element foot 3 at each of its rod ends.
  • the spacer grids 5 have springs with associated rigid knobs on the mesh walls of grid meshes, by means of which the fuel rod 8 is held in a grid mesh on each spacer grid 5 in a force-locking manner .
  • the spacer grids 5 have grid meshes 9 with a square cross section.
  • two mesh walls 10 of such a grid mesh 9 abut one another along a corner edge 11.
  • An outer edge 12 of the two mesh walls 10 runs transversely to this corner edge 11 both on the upper and on the lower side of the spacer grid 5.
  • the outer edges on the underside of the Stand grids 5 are not recognizable in FIGS. 2 and 3.
  • Each of the four corner edges 11 of the mesh 9 forms a mesh corner both on the upper side and on the underside of the spacer grid 5. Both mesh corners are spaced apart from one another, and of both mesh corners only the mesh corner 13 can be seen in FIGS. 2 and 3 on the upper side of the spacer grating 5.
  • the outer edges 12 of two mesh walls 10 of the mesh 9 each have an outer edge section 14 on the corner edge 11, with which the two outer edges 12 meet in the mesh corner 13. In these outer edge sections 14, the outer edges 12 are inclined toward the other mesh corner, which is located on the corner edge 11 on the other side of the spacer grid 5.
  • a hollow-cylindrical guide sleeve 15 for a control rod guide tube 4 has four outwardly drawn tongues 16 on one sleeve end, of which only three tongues are visible in FIGS. 2 and 3. With respect to the central axis of the guide sleeve 15, these tongues 16 are each at an angular distance of 90 °.
  • the tongue edges 16a and 16b are of equal length and form an acute angle with one another, i.e. each tongue 16 represents an acute-angled, isosceles triangle.
  • Each tongue 16 is one between its
  • Tongue edges 16a and 16b running direction 16c are convexly curved on the outside.
  • each of the four tongues 16 is welded to the inclined outer edge portion 14 of one of two mesh walls and the tongue edge 16b is welded to the inclined outer edge portion 14 of the other mesh wall 10 of these two mesh walls, which are the same in the same Hit corner edge 11 of mesh 9.
  • Each tongue 16 is thus arranged between the two outer edge sections 14 assigned to it.
  • this guide sleeve 15 can be rigidly welded to a control rod guide tube that passes through it.
  • Nuclear reactor can also cause a lateral force F and thus lateral deflection paths s of the spacer grids 5.
  • curve I shows the course of the deflection path s recognizable in FIG. 4 as a function of the
  • This curve I passes through the zero point of the coordinate system, i.e. there is no final deformation of the nuclear reactor fuel element, which would also include a hysteresis loop II shown in FIG. 5.

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)

Abstract

Une grille rigide d'écartement comprend une maille (9) avec deux parois (10) adjacentes à une arête (11) de la maille et dont les bords extérieurs (12) s'étendent transversalement à l'arête (11) et se rejoignent à un des deux coins mutuellement espacés (13) de l'arête (11). Un bord extérieur (12) est associé à une paroi (10) de la maille et l'autre bord extérieur (12) est associé à l'autre paroi (10) de la maille. Les deux bords extérieurs (12) sont pourvus au niveau de l'arête (11) d'une section inclinée vers l'autre coin (13) de la maille. Un manchon (15) de guidage d'un corps en forme de barre comprend à une extrémité une languette (16) qui fait saillie vers l'extérieur et dont les rebords (16a, 16b) sont assujettis à la section (14) du bord extérieur des deux parois (10) de la maille.
PCT/DE1995/000214 1994-03-08 1995-02-20 Grille d'ecartement des crayons combustibles contenant du combustible nucleaire dans un element combustible de reacteur nucleaire WO1995024718A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4407711.4 1994-03-08
DE4407711 1994-03-08

Publications (1)

Publication Number Publication Date
WO1995024718A1 true WO1995024718A1 (fr) 1995-09-14

Family

ID=6512172

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/000214 WO1995024718A1 (fr) 1994-03-08 1995-02-20 Grille d'ecartement des crayons combustibles contenant du combustible nucleaire dans un element combustible de reacteur nucleaire

Country Status (2)

Country Link
TW (1) TW289116B (fr)
WO (1) WO1995024718A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005013286A2 (fr) * 2003-07-28 2005-02-10 Framatome Anp Gmbh Element de combustible pour un reacteur nucleaire a eau sous pression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077709A1 (fr) * 1981-10-16 1983-04-27 Commissariat à l'Energie Atomique Grille d'espacement pour élément combustible de réacteur nucléaire
EP0088675A1 (fr) * 1982-03-04 1983-09-14 Commissariat à l'Energie Atomique Assemblage combustible de réacteur nucléaire
GB2238902A (en) * 1989-12-06 1991-06-12 Mitsubishi Nuclear Fuel Grid for nuclear fuel assembly
GB2239124A (en) * 1989-12-06 1991-06-19 Mitsubishi Nuclear Fuel Grid for nuclear fuel assembly
EP0516542A1 (fr) * 1991-05-30 1992-12-02 Framatome Grille thermohydraulique et assemblage combustible nucléaire en comportant application

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077709A1 (fr) * 1981-10-16 1983-04-27 Commissariat à l'Energie Atomique Grille d'espacement pour élément combustible de réacteur nucléaire
EP0088675A1 (fr) * 1982-03-04 1983-09-14 Commissariat à l'Energie Atomique Assemblage combustible de réacteur nucléaire
GB2238902A (en) * 1989-12-06 1991-06-12 Mitsubishi Nuclear Fuel Grid for nuclear fuel assembly
GB2239124A (en) * 1989-12-06 1991-06-19 Mitsubishi Nuclear Fuel Grid for nuclear fuel assembly
EP0516542A1 (fr) * 1991-05-30 1992-12-02 Framatome Grille thermohydraulique et assemblage combustible nucléaire en comportant application

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005013286A2 (fr) * 2003-07-28 2005-02-10 Framatome Anp Gmbh Element de combustible pour un reacteur nucleaire a eau sous pression
WO2005013286A3 (fr) * 2003-07-28 2005-06-23 Framatome Anp Gmbh Element de combustible pour un reacteur nucleaire a eau sous pression
CN1320553C (zh) * 2003-07-28 2007-06-06 法玛通Anp有限公司 用于压水核反应堆的燃料元件

Also Published As

Publication number Publication date
TW289116B (fr) 1996-10-21

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