CH622478A5 - Storage rack for fuel elements - Google Patents
Storage rack for fuel elements Download PDFInfo
- Publication number
- CH622478A5 CH622478A5 CH965477A CH965477A CH622478A5 CH 622478 A5 CH622478 A5 CH 622478A5 CH 965477 A CH965477 A CH 965477A CH 965477 A CH965477 A CH 965477A CH 622478 A5 CH622478 A5 CH 622478A5
- Authority
- CH
- Switzerland
- Prior art keywords
- containers
- fuel elements
- neutron
- storage rack
- stainless steel
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002915 spent fuel radioactive waste Substances 0.000 claims abstract description 11
- 125000006850 spacer group Chemical group 0.000 claims abstract description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052796 boron Inorganic materials 0.000 claims abstract description 5
- 230000007797 corrosion Effects 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 238000004873 anchoring Methods 0.000 claims abstract description 3
- 239000011358 absorbing material Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 239000006096 absorbing agent Substances 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- 229910000712 Boron steel Inorganic materials 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract 3
- 238000012216 screening Methods 0.000 abstract 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 abstract 1
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
- G21C19/40—Arrangements for preventing occurrence of critical conditions, e.g. during storage
-
- 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
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)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The storage rack (1) for the spent fuel elements consists of a large number of containers (2) of square cross-section, arranged side by side, whose lateral walls are each formed from two Z-shaped profiled metal sheets (3). Between the individual containers are cavities (4), which are filled with water when the rack (1) is stored in the water tank. The Z-shaped profiles (3) are held together by tensioning bolts (5) which are surrounded by spacer sleeves (6) for the precise setting of the distances within and between the containers (2). The tensioning bolts (5) are for their part situated in corresponding holes in the anchoring metal sheets (7). The Z-shaped profiled metal sheets consist of stainless steel alloy with boron. With the storage rack, short distances between the individual fuel elements can be achieved by corresponding structural and screening measures. The storage rack is corrosion resistant and has a high heat conductance. Furthermore, the storage rack can be set to different grid scales with close tolerance, and can be easily installed and dismantled. <IMAGE>
Description
**WARNUNG** Anfang DESC Feld konnte Ende CLMS uberlappen **.
PATENTANSPRÜCHE
1. Lagergestell für abgebrannte Brennelemente, bestehend aus mehreren zusammengefügten Behältern mit quadratischem Querschnitt aus einem neutronenabsorbierenden Werkstoff, in deren Hohlräume die Brennelemente eingefahren werden, dadurch gekennzeichnet, dass die Wandungen dieser Behälter (2) von jeweils zwei Z-Profilblechen (3) gebildet werden, die über Distanzhülsen (6) und Zugankerschrauben (5) zu den entsprechenden Lagergestellen zusammengefügt sind.
2. Lagergestell nach Anspruch 1, dadurch gekennzeichnet, dass die Z-Profile aus mit Bor legiertem Edelstahl, alle anderen Konstruktionsteile aus rostfreiem Edelstahl bestehen.
Die Erfindung betrifft Lagergestelle für abgebrannte Brennelemente, bestehend aus mehreren zusammengefügten Behältern mit quadratischem Querschnitt aus einem neutronenabsorbierenden Werkstoff, in deren Hohlräume die Brennelemente eingebracht werden.
In den nächsten Jahren werden weltweit erhebliche Mengen abgebrannter Brennelementbündel aus Kernkraftwerken und sonstigen Leistungsreaktoren anfallen, die bis zu ihrer Wiederaufbereitung in Wasserbecken gelagert werden müssen. Dabei muss sichergestellt sein, dass die Brennelementanordnung in diesen Becken stets kritikalitätssicher bleibt. In den bisherigen Wasserbecken betrug der Kante-Kante-Abstand der Brennelementstäbe allseitig etwa 30 cm, wodurch eine praktisch vollständige Isolation der einzelnen Elemente voneinander erreicht wurde. Zur Erhöhung der Lagerbekkenkapazität ist es jedoch wünschenswert, die Brennelementbündel im Wasserbecken dichter anzuordnen. Das kann man erreichen, wenn man Neutronenabsorber in Kasten- oder Plattenform verwendet, zwischen denen die Brennelemente angeordnet werden.
Die Lagergestelle müssen ausserdem korrosionsbeständig sein und eine gute Wärmeleitfähigkeit besitzen, um die Wärmeabfuhr nicht zu behindern.
Bei bekannten Anordnungen werden quadratische Roh- re , die aus Aluminium oder Edelstahl bestehen und in die die Brennelementstäbe eingeschoben werden, senkrecht in entsprechende Gittergestelle eingesetzt, wobei die Gitteröffnungen so angeordnet sind, dass der sichere Abstand zwischen den einzelnen Brennelementen gewahrt bleibt. Um diese Abstände möglichst klein zu halten, werden im allgemeinen neutronenabsorbierende Materialien verwendet, meist Borcarbid, entweder eingebettet zwischen den Behälterwandungen oder als eigene Absorberstäbe.
Weiterhin gibt es Lagergestelle, bei denen die einzelnen kastenförmigen Behälter fest zusammengefügt sind, beispielsweise durch Schweissen. Bei allen Lagergestellen sind die Wandungen der einzelnen Behälter von einer Wasserschicht umgeben.
Es war Aufgabe der vorliegenden Erfindung, Lagergestelle für abgebrannte Brennelemente zu schaffen, bei denen durch entsprechende Konstruktions- und Abschirmungsmassnahmen möglichst geringe Abstände zwischen den einzelnen Brennelementen erreichbar sind. Weiterhin sollen sie korrosionsbeständig sein und ein hohes Wärmeableitungsvermögen besitzen. Ausserdem müssen sie eng tolerierbar auf verschiedene Rastermassstäbe eingestellt werden können und ferner leicht montierbar und demontierbar sein.
Diese Aufgabe wurde dadurch gelöst, dass man Lagergestelle verwendet, die aus mehreren zusammengefügten Behältern mit quadratischem Querschnitt aus einem neutronenab- sorbierenden Werkstoff bestehen, wobei erfindungsgemäss die Wandungen dieser Behälter von jeweils zwei Z-Profilblechen gebildet werden, die über Distanzhülsen und Zugankerschrauben zu den entsprechenden Lagergestellen zusammengefügt sind.
Die Z-Profilbleche bestehen aus einem neutronenabsorbierenden Werkstoff, vorzugsweise aus mit Bor legiertem Edelstahl.
Die Abbildung gibt schematisch und in beispielhafter Ausführungsform einen Querschnitt aus einem solchen Lagergestell. Das Lagergestell 1 für die abgebrannten Brennelemente besteht aus einer Vielzahl von nebeneinander angeordneten Behältern 2 von quadratischem Querschnitt, deren seitliche Wandungen aus jeweils zwei Z-Profilblechen 3 gebildet werden. Zwischen den einzelnen Behältern liegen Hohlräume 4, die beim Lagern des Gestells 1 im Wasserbecken mit Wasser gefüllt sind. Die Z-Profile 3 werden von Zugankerschrauben 5 zusammengehalten, die von Distanzhülsen 6 umgeben sind, zur genauen Justierung der Abstände innerhalb und zwischen den Behältern 2. Die Zugankerschrauben 5 befinden sich ihrerseits in entsprechenden Bohrungen der Verankerungsbleche 7.
Während dieZ-Profilbleche aus einem neutronenabsorbierenden Material bestehen, vorzugsweise mit Bor legiertem Edelstahl, sind alle anderen Teile aus rostfreiem Edelstahl gefertigt. Die Neutronenabsorption zwischen zwei Brennelementen wird durch die Anordnung von jeweils zwei Borstahlwänden gewährleistet.
Die Verschraubung zweier Z-Profile ergibt einen geschlossenen Kasten, in welchem jeweils ein Brennelement abgesenkt werden kann. Mit Hilfe der Distanzhülsen ist eine Rastermasseinhaltung in vielfachen Ausführungen und sehr eng tolerierbar möglich. Alle Teile sind miteinander verschraubt und können daher sehr leicht montiert und demontiert werden.
** WARNING ** beginning of DESC field could overlap end of CLMS **.
PATENT CLAIMS
1. Storage rack for spent fuel elements, consisting of several assembled containers with a square cross-section made of a neutron-absorbing material, into the cavities of which the fuel elements are inserted, characterized in that the walls of these containers (2) are each formed by two Z-shaped plates (3) which are joined to the corresponding storage racks via spacer sleeves (6) and tie bolts (5).
2. Storage rack according to claim 1, characterized in that the Z-profiles made of stainless steel alloyed with boron, all other construction parts made of stainless steel.
The invention relates to storage racks for spent fuel elements, consisting of several assembled containers with a square cross section made of a neutron-absorbing material, in the cavities of which the fuel elements are introduced.
In the next few years, significant quantities of spent fuel bundles from nuclear power plants and other power reactors will be generated worldwide, which must be stored in water ponds until they are reprocessed. It must be ensured that the fuel assembly in these basins always remains critical. In the previous water basins, the edge-to-edge distance of the fuel rods was around 30 cm on all sides, which meant that the individual elements were virtually completely isolated from each other. In order to increase the storage basin capacity, however, it is desirable to arrange the fuel bundles closer together in the water basin. This can be achieved if neutron absorbers in box or plate form are used, between which the fuel elements are arranged.
The storage racks must also be corrosion-resistant and have good thermal conductivity so as not to hinder heat dissipation.
In known arrangements, square tubes, which consist of aluminum or stainless steel and into which the fuel element rods are inserted, are inserted vertically into corresponding lattice frames, the lattice openings being arranged in such a way that the safe distance between the individual fuel elements is maintained. In order to keep these distances as small as possible, neutron absorbing materials are generally used, mostly boron carbide, either embedded between the walls of the container or as separate absorber rods.
There are also storage racks in which the individual box-shaped containers are firmly joined together, for example by welding. With all storage racks, the walls of the individual containers are surrounded by a layer of water.
It was an object of the present invention to provide storage racks for spent fuel elements, in which the smallest possible distance between the individual fuel elements can be achieved by appropriate design and shielding measures. Furthermore, they should be corrosion-resistant and have a high heat dissipation capacity. In addition, they must be able to be adjusted to different grid scales in a tolerable manner and also be easy to assemble and disassemble.
This object was achieved in that storage racks are used which consist of several assembled containers with a square cross-section made of a neutron-absorbing material, the walls of these containers being formed according to the invention by two Z-profile sheets, which are connected to the corresponding ones by means of spacer sleeves and tie bolts Storage racks are assembled.
The Z-profile sheets are made of a neutron-absorbing material, preferably stainless steel alloyed with boron.
The figure shows schematically and in an exemplary embodiment a cross section from such a storage rack. The storage rack 1 for the spent fuel elements consists of a plurality of containers 2 of square cross-section arranged side by side, the side walls of which are each formed from two Z-shaped sheets 3. There are cavities 4 between the individual containers, which are filled with water when the frame 1 is stored in the water basin. The Z-profiles 3 are held together by tie bolts 5, which are surrounded by spacer sleeves 6, for precise adjustment of the distances inside and between the containers 2. The tie bolts 5 are in turn located in corresponding bores in the anchoring plates 7.
While the Z profile sheets are made of a neutron-absorbing material, preferably with boron-alloyed stainless steel, all other parts are made of stainless steel. The neutron absorption between two fuel elements is ensured by the arrangement of two boron steel walls.
The screwing of two Z profiles results in a closed box in which one fuel element can be lowered. With the help of the spacer sleeves, it is possible to comply with the grid dimensions in multiple versions and with very tight tolerances. All parts are screwed together and can therefore be very easily assembled and disassembled.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE7624867U DE7624867U1 (en) | 1976-08-07 | 1976-08-07 | STORAGE RACK FOR FUEL ELEMENTS |
Publications (1)
Publication Number | Publication Date |
---|---|
CH622478A5 true CH622478A5 (en) | 1981-04-15 |
Family
ID=6668137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH965477A CH622478A5 (en) | 1976-08-07 | 1977-08-05 | Storage rack for fuel elements |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5323899U (en) |
BR (1) | BR5700941U (en) |
CH (1) | CH622478A5 (en) |
DE (1) | DE7624867U1 (en) |
ES (1) | ES460593A1 (en) |
IT (1) | IT219967Z2 (en) |
NL (1) | NL182923C (en) |
SE (1) | SE424782B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2723849A1 (en) * | 1977-05-26 | 1978-12-07 | Noell Gmbh | Frame for optimal utilisation of spent nuclear fuel store - has chambers formed by screened, mirror image, profiled plates |
DE2930237C2 (en) * | 1979-07-26 | 1984-02-09 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Frame for the vertical storage of elongated nuclear reactor fuel elements |
FR2440600A1 (en) * | 1978-10-31 | 1980-05-30 | Pichon Jean Luc | Storage basket for nuclear fuel cans in swimming pool - made from smooth and flat metal sheets which are easy to clean and contain gaps for unrestricted flow of water in pool |
DE7833030U1 (en) * | 1978-11-07 | 1979-03-08 | Transnuklear Gmbh, 6450 Hanau | INSERT BASKET FOR BURN-DOWN FUEL ELEMENTS IN TRANSPORT AND / OR STORAGE CONTAINERS |
FR2463484A1 (en) * | 1979-08-07 | 1981-02-20 | Schlumpf Raymond | STORAGE BOARD FOR ASSEMBLIES OF NUCLEAR COMBUSTIBLE ELEMENTS |
US4900505A (en) * | 1981-12-22 | 1990-02-13 | Westinghouse Electric Corp. | Spent fuel storage rack |
JP2010014681A (en) * | 2008-07-07 | 2010-01-21 | Toshiba Corp | Spent fuel storage rack and manufacturing method therefor |
US9437332B2 (en) * | 2011-02-04 | 2016-09-06 | Mitsubishi Heavy Industries, Ltd. | Nuclear fuel storage rack |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1223773B (en) * | 1964-07-17 | 1966-09-01 | Nikolaus Laing | Device for changing the permeability of a wall for electromagnetic radiation |
DE1639396B2 (en) * | 1968-01-27 | 1972-11-23 | Siemens AG, 1000 Berlin u. 8000 München | DEVICE FOR STORING FUEL ELEMENTS IN A COATING BASIN OF A NUCLEAR REACTOR |
DE2259669A1 (en) * | 1972-12-06 | 1974-06-12 | Licentia Gmbh | Irradiated fuel storage facility - with transversely mounted beams supporting fuel elements giving economic construction |
SE369243B (en) * | 1972-12-21 | 1974-08-12 | Asea Atom Ab |
-
1976
- 1976-08-07 DE DE7624867U patent/DE7624867U1/en not_active Expired
-
1977
- 1977-04-22 JP JP1977051317U patent/JPS5323899U/ja active Pending
- 1977-06-24 NL NLAANVRAGE7707041,A patent/NL182923C/en not_active IP Right Cessation
- 1977-07-09 ES ES460593A patent/ES460593A1/en not_active Expired
- 1977-07-12 IT IT7753328U patent/IT219967Z2/en active
- 1977-08-05 SE SE7708941A patent/SE424782B/en not_active IP Right Cessation
- 1977-08-05 CH CH965477A patent/CH622478A5/en not_active IP Right Cessation
- 1977-08-05 BR BR5700941U patent/BR5700941U/en unknown
Also Published As
Publication number | Publication date |
---|---|
NL7707041A (en) | 1978-02-09 |
JPS5323899U (en) | 1978-02-28 |
ES460593A1 (en) | 1978-08-16 |
DE7624867U1 (en) | 1976-12-02 |
SE7708941L (en) | 1978-02-08 |
IT219967Z2 (en) | 1993-05-31 |
SE424782B (en) | 1982-08-09 |
BR5700941U (en) | 1978-04-04 |
NL182923B (en) | 1988-01-04 |
NL182923C (en) | 1988-06-01 |
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Legal Events
Date | Code | Title | Description |
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PL | Patent ceased | ||
PL | Patent ceased |