WO2004010438A2 - Method for preparing a built-in part of a fuel element of a pressurised water nuclear reactor for disposal, and corresponding conditioned built-in part - Google Patents
Method for preparing a built-in part of a fuel element of a pressurised water nuclear reactor for disposal, and corresponding conditioned built-in part Download PDFInfo
- Publication number
- WO2004010438A2 WO2004010438A2 PCT/EP2003/007154 EP0307154W WO2004010438A2 WO 2004010438 A2 WO2004010438 A2 WO 2004010438A2 EP 0307154 W EP0307154 W EP 0307154W WO 2004010438 A2 WO2004010438 A2 WO 2004010438A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- retaining ring
- installation part
- spring
- threaded bolt
- built
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/34—Apparatus or processes for dismantling nuclear fuel, e.g. before reprocessing ; Apparatus or processes for dismantling strings of spent fuel elements
-
- 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 method for preparing an installation part of a fuel element of a pressurized water nuclear reactor, in particular a control element, for disposal.
- the invention also relates to an installation part conditioned for disposal by this method.
- the built-in parts of a fuel element of a pressurized 15 nuclear reactor including control elements, absorber elements, neutron sources and throttle bodies, as well as other nuclear plant parts, are subject to wear, which means that they have to be replaced from time to time.
- the replaced installation parts as well as spent fuel elements must be disposed of.
- the invention is based on the object of specifying a method for preparing a built-in part of a fuel element of a pressurized water nuclear reactor for disposal, which can be carried out without problems and in which the required processing effort is reduced to a minimum.
- the invention is based on the object of specifying a correspondingly conditioned installation part.
- the first-mentioned object is achieved according to the invention with a method having the features of claim 1.
- this method one is used to support the built-in part on the upper lattice plate of a fuel assembly, resiliently and axially displaceably mounted on the head of the built-in support element against the action of the spring in a retracted position.
- This measure makes it possible to dispose of the built-in part together with a fuel assembly, since the projection of the control element over the hold-down springs or the head frame of the fuel assembly, determined by the axial deflection of the support element, is reduced so far by utilizing the available spring travel that that from the built-in part and fuel element can be inserted into existing containers for disposal in containers that are originally intended for the transport and storage of fuel elements and are adapted to their dimensions.
- the invention is based on the knowledge that the available spring travel of the support element is large enough to reduce this protrusion to a level that ensures that the space available per se in the already existing and approved storage and transport container, even when taking account of radiation-induced Growth and the lengthwise expansion of the bundle consisting of the fuel assembly and built-in part caused by the temperature increase in the container are sufficient to accommodate this bundle.
- the built-in part is inserted into a fuel assembly, so that it rests at least indirectly on the upper lattice plate. Then the installation part is pressed against the action of the spring against the grid plate, so that the support element is pushed back against the action of the spring. This compressed or retracted position is then fixed.
- This measure makes it possible to mount the built-in part on site, for example in the fuel element storage pool, with the equipment available there and in accordance with the method with auxiliary devices. handling equipment, especially the
- Fuel assembly machine to edit The need for additional auxiliary devices is reduced to a minimum, since the fuel element itself serves as a receptacle for the installation part during the conditioning.
- a lower retaining ring for the support element is placed on the upper lattice plate of the fuel assembly (lower head plate) before inserting the built-in part, which in the compressed position is axially form-fitting (axially) with an upper retainer ring inserted on the built-in part Frictional connection by positive connection).
- FIG. 1 shows a control element inserted into the head frame of a fuel assembly before its conditioning in a partial longitudinal section
- FIG. 2 shows a control element inserted into the head frame of the fuel element and conditioned according to the invention, likewise in a longitudinal section
- FIG. 3 shows a top view of the fuel element provided with the conditioned control element from above
- FIG. 4 shows a section through an auxiliary device for conditioning the control element in a longitudinal section
- FIG. 5 shows a plan view of an upper retaining ring in the area of the through hole for the threaded bolt
- FIG. 6 shows a longitudinal section through the threaded bolt in the area of the threaded bolt head.
- Head frame 4 is shown.
- the control element 1 is retracted to the maximum and lies on the grid plate 6 of the head frame 4 with a weight force reduced by the buoyancy in water by means of a spring-mounted, sleeve-shaped support element 5.
- the sleeve-shaped support element 5 is axially displaceable by means of a spring 7 on one on the head part 9 of the control element fixed stud 10 and is secured in the relieved state by a stop face 11 arranged on the end face of the stud 10, which corresponds to a corresponding annular circumferential shoulder surface 12 on the inner circumference of the support element 5.
- the distance C between the top of the grid plate 6 of the head frame 4 and the end face 13 of the stud 10 corresponds to the maximum spring or braking distance that is available for the control element 1 incident in the fuel element 3.
- the dead weight of the control element 1, the spring constant and the bias of the spring 7 are dimensioned such that the dead weight of the control element 1 does not lead to a gap between the stop surface 11 and the shoulder surface 12.
- the head part 9 of the control element 1 forms a spider-like carrier, on the support arms 14 of which the control rods 2 are fastened by screw connections.
- the ' control element 1 extends beyond the hold-down springs 15 by the projection A above the head frame 4 or by the projection A'.
- This protrusion A, A ' is now too large for the fuel element 3 to be disposed of or stored together with the control element 1 in a container provided and approved for this fuel element 3.
- the invention is now based on the consideration that the spring travel C is sufficient to shorten the projection A, A 'to such an extent that the fuel element 3 provided with the control element 1 can be introduced into this container.
- Fig. 2 now shows a situation in which the control element 1 with a symbolically illustrated by arrows F force is pressed against the grid plate 6 of the head frame 4, so that the support element 5 is pushed back axially against the action of the spring 7. In this pushed back or compressed position, the support element 5 is fixed, so that this position is maintained even when no more force is exerted on the control element.
- a lower retaining ring 20 and an upper retaining ring 22 are used for this purpose.
- the lower retaining ring 20 also forms a seat for the supporting element 5 by shaping which is suitably adapted to the supporting element 5.
- the inner surface of the lower retaining ring 20 is conically shaped in the region of the support surface and adapted to the conically shaped outer surface 23 of the support element 5.
- the lower retaining ring 20 thus forms a stop for the annular support element 5, so that this is at
- Relief can no longer move axially under the action of the spring 7 when the lower retaining ring 20 is fixed relative to the head part of the control element 1.
- the lower retaining ring 20 is screwed to the upper retaining ring 22 resting on the support arms 14 by means of threaded bolts (not shown in the figure).
- a shoulder can also be provided on the retaining ring, which engages under the support element 5, so that its end face rests on this shoulder.
- the upper retaining ring 22 resting on the support arms 14 can be seen in the plan view according to FIG. 3. With the help of two threaded bolts 24, this is with the unseen only visible at the edgenic retaining ring 20 screwed.
- the retaining rings 20, 22 are also each provided with a mounting hole 30 which have an internal thread and a conical insertion bevel 31. A mounting rod can be screwed into this mounting hole 30, which enables the holding rings 20, 22 to be handled when they are mounted using a rod tool.
- the auxiliary device composed of lower retaining ring 20, upper retaining ring 22 and threaded bolt 24 is illustrated in more detail in FIG. 4.
- Both retaining rings 20, 22 are each provided with a mandrel 28 and 29, which protrude into a corresponding recess in the lower grid plate 20 or into a free space between the support arms 14 and serve to prevent rotation.
- the through bores 25 arranged in the upper retaining ring 22 for the threaded bolts 24 are stepped and each have an annular circumferential contact shoulder 26 on which the head 27 of the threaded bolt 24 is seated in the final assembly state.
- the part of the through hole 25 with the smaller inside diameter is also provided with a thread, so that the threaded bolt 24 can be screwed into the upper retaining ring 22 to facilitate assembly and can be placed together with the latter on the control element. This eliminates the need to subsequently insert the threaded bolts 24.
- the lower retaining ring 22 is also provided with a mounting hole 30, which facilitates its handling with a mounting rod screwed into it.
- FIG. 5 shows an advantageous design of the receptacle for the cylindrical head 27 of the threaded bolt 24 in the through bore 25 in the upper retaining ring 22.
- a plurality of radial recesses or grooves 33 are machined into the annular contact shoulder 26 of the through bore 25, with corresponding ones on the underside of the head 27 of the threaded bolt 24 arranged and shown in Fig. 6 corresponding shapes or webs 34 correspond.
- the threaded bolt 24 is screwed in as far as possible in such a way that the grooves 33 are aligned with the webs 34 and come into engagement with them when the axial springback caused by the spring 7 (FIG. 1, 2) relieves them, and thus by shape - Conclusion between the head 27 of the threaded bolt 24 and the upper retaining ring 22 form an anti-rotation of the threaded bolt 24.
- connection between the upper and lower holding plate can also be provided which enable axial fixation.
- This can also be done, for example, by means of a bayonet connection, which is also designed to prevent rotation.
- the bayonet connection can be made in the upper or lower retaining ring.
- the conditioning of the control element 2 takes place under water according to the following procedure:
- the lower holding plate 20 is inserted with a rod tool into the fuel element 3 in the fuel pool, with the control element 1 removed, and placed on the grid plate 6 of the head frame 4, so that it engages with its mandrel 28 in a through hole in the grid plate 6 and in this way is secured against twisting.
- the control element 1 is then introduced into the fuel element 3 with the aid of the fuel element loading machine.
- the upper holding plate 22 is then placed on the head part 9 of the control element 1 together with the threaded bolts 24 preassembled in it with the rod tool.
- a pressure device for example a pneumatic device, which is supported on the upper frame part of the head frame 4, the control element 1 is pressed down until the end face of the stud 10 rests on the grid plate 6. In other words: the stud 10 and thus the control element 1 are pressed directly against the grid plate 6.
- the preassembled threaded bolts are now screwed through the upper retaining ring 22 and their threads are screwed into the threaded bores of the lower retaining ring 20.
- the grooves 33 machined in the contact shoulder 26 'must then be aligned with the corresponding webs 34 on the head 27 of the threaded bolt 24 at a minimal axial distance between the retaining ring 22 and the head of the threaded bolt 24.
- the lower and upper retaining ring 20, 22 are pressed apart by the spring 7 for the play, so that grooves 33 and webs 34 engage in one another and the threaded bolt 24 is secured against rotation.
- the stud 10 then lifts off the grid plate 6.
- the anti-twist device reliably prevents the threaded bolt 24 from loosening automatically.
- the invention has been explained above on the basis of the conditioning of a control element. However, it can basically be applied to all built-in parts of a fuel assembly that are structurally comparable to the control element in their head area, are supported resiliently on the upper lattice plate and protrude over the hold-down springs in the relieved state. LIST OF REFERENCE NUMBERS
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)
- Fuel-Injection Apparatus (AREA)
- Connection Of Plates (AREA)
- Springs (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004522401A JP2005533259A (en) | 2002-07-18 | 2003-07-04 | Preparation methods and built-in parts for disposal of built-in parts for pressurized water reactors |
EP03764937A EP1523747A2 (en) | 2002-07-18 | 2003-07-04 | Method for preparing a built-in part of a fuel element of a pressurised water nuclear reactor for disposal, and corresponding conditioned built-in part |
US11/039,610 US20050207524A1 (en) | 2002-07-18 | 2005-01-18 | Method for preparing a built-in part of a fuel element of a pressurized water nuclear reactor for disposal, and corresponding conditioned built-in part |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10232596A DE10232596B3 (en) | 2002-07-18 | 2002-07-18 | Method for preparing a built-in part of a fuel assembly of a pressurized water nuclear reactor for disposal |
DE10232596.0 | 2002-07-18 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/039,610 Continuation US20050207524A1 (en) | 2002-07-18 | 2005-01-18 | Method for preparing a built-in part of a fuel element of a pressurized water nuclear reactor for disposal, and corresponding conditioned built-in part |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004010438A2 true WO2004010438A2 (en) | 2004-01-29 |
WO2004010438A3 WO2004010438A3 (en) | 2004-04-08 |
Family
ID=30128148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/007154 WO2004010438A2 (en) | 2002-07-18 | 2003-07-04 | Method for preparing a built-in part of a fuel element of a pressurised water nuclear reactor for disposal, and corresponding conditioned built-in part |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1523747A2 (en) |
JP (1) | JP2005533259A (en) |
KR (1) | KR20050027245A (en) |
DE (1) | DE10232596B3 (en) |
WO (1) | WO2004010438A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017049085A (en) * | 2015-09-01 | 2017-03-09 | 原子燃料工業株式会社 | Direct disposal method of used nuclear fuel |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161170A1 (en) * | 1984-04-10 | 1985-11-13 | Framatome | Upper end fitting for a nuclear fuel assembly |
EP0222373A1 (en) * | 1985-11-14 | 1987-05-20 | Westinghouse Electric Corporation | Top end support for water displacement rod guides of pressurized water nuclear reactor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07280979A (en) * | 1994-04-08 | 1995-10-27 | Ishikawajima Harima Heavy Ind Co Ltd | Control rod supporting structure in nuclear reactor for ship |
RU2146401C1 (en) * | 1998-02-04 | 2000-03-10 | Государственное предприятие Ленинградская атомная электростанция им.В.И.Ленина | Device for holding radioactive fuel assemblies |
-
2002
- 2002-07-18 DE DE10232596A patent/DE10232596B3/en not_active Expired - Fee Related
-
2003
- 2003-07-04 EP EP03764937A patent/EP1523747A2/en not_active Withdrawn
- 2003-07-04 KR KR1020057000918A patent/KR20050027245A/en not_active Application Discontinuation
- 2003-07-04 JP JP2004522401A patent/JP2005533259A/en not_active Abandoned
- 2003-07-04 WO PCT/EP2003/007154 patent/WO2004010438A2/en not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161170A1 (en) * | 1984-04-10 | 1985-11-13 | Framatome | Upper end fitting for a nuclear fuel assembly |
EP0222373A1 (en) * | 1985-11-14 | 1987-05-20 | Westinghouse Electric Corporation | Top end support for water displacement rod guides of pressurized water nuclear reactor |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch, Week 200055 Derwent Publications Ltd., London, GB; Class K07, AN 2000-585779 XP002267139 & RU 2 146 401 C (LENGD NUCLEAR POWER STATION), 10. März 2000 (2000-03-10) * |
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 02, 29. Februar 1996 (1996-02-29) & JP 07 280979 A (ISHIKAWAJIMA HARIMA HEAVY IND CO LTD), 27. Oktober 1995 (1995-10-27) * |
Also Published As
Publication number | Publication date |
---|---|
KR20050027245A (en) | 2005-03-18 |
EP1523747A2 (en) | 2005-04-20 |
WO2004010438A3 (en) | 2004-04-08 |
JP2005533259A (en) | 2005-11-04 |
DE10232596B3 (en) | 2004-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0370427B1 (en) | Core insertions for a water-cooled nuclear reactor | |
DE3510926C2 (en) | Clamping device for mechanical clamping of fasteners | |
AT514431A4 (en) | tensioning device | |
EP1910029A1 (en) | Tensioning device | |
CH631789A5 (en) | TURNING LOCK FOR CYLINDER HEAD SCREWS WITH MULTI-SIDED INSIDE AND TOOL FOR PLASTICALLY DEFORMING FOR SUCH A TURNING LOCKING. | |
EP0110090B1 (en) | Nuclear reactor fuel assembly | |
DE19834040A1 (en) | Rapid clamping cylinder for a workpiece carrier plate or pallet | |
DE2459645A1 (en) | MOTOR-DRIVEN SCREW AND TRANSPORT TOOL FOR PRESSURE TANK, IN PARTICULAR NUCLEAR REACTOR PRESSURE TANK | |
WO2002090028A1 (en) | Method and device for machining annular-shaped workpieces | |
EP3594134A1 (en) | Tube holder for a tube filling machine | |
DE2345754A1 (en) | METHOD AND DEVICE FOR SUPPORTING AN AXLE, PIVOT, OR OTHER SIMILAR BODY BETWEEN TWO PARALLEL PARTS | |
DE3641295C2 (en) | ||
DE10232596B3 (en) | Method for preparing a built-in part of a fuel assembly of a pressurized water nuclear reactor for disposal | |
EP0873816A2 (en) | Cylinder for positioning and quick-action clamping | |
DE2637879C3 (en) | Support for a fuel assembly storage rack | |
WO2020025828A1 (en) | Motor spindle for a machine, particularly for a machine tool, with braced bearing arrangement, and method for mounting a motor spindle of this kind | |
DE19609350C1 (en) | Core container for a reactor pressure vessel of a nuclear reactor plant and method for its assembly | |
EP3365151B1 (en) | Welded assembly and process for manufacturing a welded assembly | |
WO2004033146A1 (en) | Assembly device | |
DE102022105715B3 (en) | Fastening arrangement for a processing machine and method for actuating the fastening arrangement | |
DE102019210121B4 (en) | Method for replacing a mounted bearing of a motor vehicle, which is held in a bearing seat of an assembly holder | |
DE2308800A1 (en) | Nuclear reactor fuel rod assembly - with split collar retainers for upper space plate | |
DE102022210808A1 (en) | Method and device for providing shims for support and/or work rolls of a roll stand | |
CH636219A5 (en) | Rack for storing nuclear fuel element bundles | |
US20050207524A1 (en) | Method for preparing a built-in part of a fuel element of a pressurized water nuclear reactor for disposal, and corresponding conditioned built-in part |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2003764937 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004522401 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020057000918 Country of ref document: KR Ref document number: 11039610 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1020057000918 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2003764937 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2003764937 Country of ref document: EP |