CH622903A5 - Storage rack for fuel elements - Google Patents
Storage rack for fuel elements Download PDFInfo
- Publication number
- CH622903A5 CH622903A5 CH1115277A CH1115277A CH622903A5 CH 622903 A5 CH622903 A5 CH 622903A5 CH 1115277 A CH1115277 A CH 1115277A CH 1115277 A CH1115277 A CH 1115277A CH 622903 A5 CH622903 A5 CH 622903A5
- Authority
- CH
- Switzerland
- Prior art keywords
- containers
- fuel elements
- individual
- storage racks
- neutron
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 23
- 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
- 230000007797 corrosion Effects 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 239000011358 absorbing material Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 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
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 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)
- Buffer Packaging (AREA)
- Packages (AREA)
- Packaging Of Machine Parts And Wound Products (AREA)
- Stackable Containers (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The storage rack (1) for the spent fuel elements consists of a multiplicity of containers (2) of square cross-section which are arranged juxtaposed and whose side walls are formed from respectively two rectangular plates (3, 4) which are fixed in profiled rods (5) which have correspondingly shaped recesses (6) into which the plates (3, 4) are plugged. The profiled rods (5) are joined by means of threaded tie bolts (7) to form storage racks of corresponding size. Cavities (8) which are filled with water when the rack (1) is stored in the water basin are situated between the individual containers (2). The distances between the individual containers (2) or the fuel elements can be adjusted by the width of the plates (3, 4). Since all the parts are bolted to one another, the storage rack can very easily be assembled and disassembled. Short distances between the individual fuel elements can be achieved by appropriate design and shielding measures. The storage rack is corrosion-resistant and has a high heat-dissipating capacity. <IMAGE>
Description
**WARNUNG** Anfang DESC Feld konnte Ende CLMS uberlappen **.
PATENTANSPRUCH
Lagergestell für abgebrannte Brennelemente, bestehend aus mehreren zusammengefügten Behältern mit quadratischem Querschnitt aus einem neutronenabsorbierenden Material, dadurch gekennzeichnet, dass die einzelnen Wandungen dieser Behälter (2) von jeweils zwei rechteckigen Blechen (3,4) gebildet werden, die in entsprechenden Ausnehmungen (6) von Profilstäben (5) fixiert und mittels Zugankerschrauben (7) zu den entsprechenden Lagergestellen zusammengefügt sind.
- Die Erfindung betrifft Lagergestelle für abgebrannte Brennelemente, bestehend aus mehreren zusammengefügten Behältern aus einem neutronenabsorbierenden Werkstoff, in deren Inneres 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 Lagerbeckenkapazität 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 qudratische Rohre , 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 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 aus 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 neutronenabsorbierenden Werkstoff bestehen, wobei erfindungsgemäss die einzelnen Wandungen dieser Behälter von jeweils zwei recht eckigen Blechen gebildet werden, die in entsprechend geformten Ausnehmungen von Profilstäben fixiert und Zugankerschrauben zu den entsprechenden Lagergestellen zusammengefügt sind.
Die Bleche der Wandungen bestehen vorzugsweise aus einem mit Bor legiertem Edelstahl, die übrigen Teile der Lagergestelle aus rostfreiem Edelstahl. Die Neutronenabsorption zwischen zwei Brennelementen wird durch die Anordnung von jeweils zwei Wandungen aus einem neutronenabsorbierenden Werkstoff zwischen den beiden Elementen gewährleistet.
Die Abbildung gibt schematisch und in beispielhafter Ausführungsform einen Querschnitt aus einem solchen Lagergestell wieder.
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 rechteckigen Blechen 3,4 gebildet werden, die in Profilstäben 5 fixiert sind, die entsprechend geformte Ausnehmungen 6 besitzen, in die die Bleche 3,4 gesteckt werden. Mittels Zugankerschrauben 7 werden die Profilstäbe 5 zu entsprechend grossen Lagergestellen zusammengefügt. Zwischen den einzelnen Behältern 2 liegen Hohlräume 8, die beim Lagern des Gestells 1 im Wasserbecken mit Wasser gefüllt sind. Die Abstände zwischen den einzelnen Behältern 2 bzw. den Brennelementen lassen sich durch die Breite der Bleche 3,4 einjustieren. Da alle Teile miteinander verschraubt sind, können die erfindungsgemässen Lagergestelle sehr leicht montiert und demontiert werden.
** WARNING ** beginning of DESC field could overlap end of CLMS **.
PATENT CLAIM
Storage rack for spent fuel elements, consisting of several assembled containers with a square cross-section made of a neutron-absorbing material, characterized in that the individual walls of these containers (2) are each formed by two rectangular sheets (3, 4) which are arranged in corresponding recesses (6). fixed by profile bars (5) and joined together by means of tie bolts (7) to form the corresponding storage racks.
- The invention relates to storage racks for spent fuel elements, consisting of several assembled containers made of a neutron-absorbing material, in the interior 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. However, to increase the storage pool capacity, it is desirable to arrange the fuel bundles closer together in the water pool. 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 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 from different grid scales in a tolerable manner and also be easy to assemble and disassemble.
This object was achieved by using storage racks which consist of several assembled containers with a square cross-section made of a neutron-absorbing material, the individual walls of these containers being formed according to the invention by two right-angled sheets, which are fixed in appropriately shaped recesses in profile bars and Tie bolts are assembled to the corresponding storage racks.
The sheets of the walls are preferably made of a stainless steel alloyed with boron, the remaining parts of the storage racks made of stainless steel. The neutron absorption between two fuel elements is ensured by the arrangement of two walls made of a neutron-absorbing material between the two elements.
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 consists of a plurality of juxtaposed containers 2 of square cross-section, the side walls of which are formed from two rectangular sheets 3, 4, which are fixed in profile bars 5, which have correspondingly shaped recesses 6 into which the sheets 3, 4 are inserted. Tension bolts 7 are used to join the profile bars 5 to correspondingly large storage racks. Between the individual containers 2 there are cavities 8 which are filled with water when the frame 1 is stored in the water basin. The distances between the individual containers 2 or the fuel elements can be adjusted by the width of the sheets 3, 4. Since all parts are screwed together, the storage racks according to the invention can be very easily assembled and disassembled.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE7628639U DE7628639U1 (en) | 1976-09-14 | 1976-09-14 | STORAGE RACK FOR FUEL ELEMENTS |
Publications (1)
Publication Number | Publication Date |
---|---|
CH622903A5 true CH622903A5 (en) | 1981-04-30 |
Family
ID=6669180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1115277A CH622903A5 (en) | 1976-09-14 | 1977-09-13 | Storage rack for fuel elements |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5343198U (en) |
BR (1) | BR5701127U (en) |
CH (1) | CH622903A5 (en) |
DE (1) | DE7628639U1 (en) |
ES (1) | ES460594A1 (en) |
NL (1) | NL7707212A (en) |
SE (1) | SE7709996L (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109461A1 (en) * | 1982-11-17 | 1984-05-30 | GebràDer Sulzer Aktiengesellschaft | Rack for storing nuclear fuel elements |
EP0158849A1 (en) * | 1984-04-10 | 1985-10-23 | TRANSNUKLEAR GmbH | Basket for a transport and storage container |
FR2585171A1 (en) * | 1985-07-22 | 1987-01-23 | British Nuclear Fuels Plc | CONTAINER FOR NUCLEAR FUEL ELEMENT |
EP0288837A3 (en) * | 1987-05-01 | 1989-08-09 | Westinghouse Electric Corporation | Basket structure for a nuclear-fuel transportation cask |
FR2650113A2 (en) * | 1988-02-19 | 1991-01-25 | Transnucleaire | Improvement to a rack for storing nuclear fuel elements |
CN102723115A (en) * | 2012-06-29 | 2012-10-10 | 中广核工程有限公司 | Spent fuel storage grillage for nuclear power plant |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE2904362C2 (en) * | 1979-02-06 | 1982-04-15 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Storage rack for nuclear reactor fuel elements |
US4857263A (en) * | 1983-03-01 | 1989-08-15 | Westinghouse Electric Corp. | Storage of spent nuclear fuel |
JPS6175993A (en) * | 1984-09-21 | 1986-04-18 | 三菱電機株式会社 | Vending equipment |
JPS6175995A (en) * | 1984-09-21 | 1986-04-18 | 三菱電機株式会社 | Vending equipment |
JP6324477B2 (en) * | 2016-12-15 | 2018-05-16 | 三菱重工業株式会社 | Fuel storage rack |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4938261U (en) * | 1972-07-03 | 1974-04-04 | ||
SE369243B (en) * | 1972-12-21 | 1974-08-12 | Asea Atom Ab |
-
1976
- 1976-09-14 DE DE7628639U patent/DE7628639U1/en not_active Expired
-
1977
- 1977-04-22 JP JP1977051318U patent/JPS5343198U/ja active Pending
- 1977-06-29 NL NL7707212A patent/NL7707212A/en not_active Application Discontinuation
- 1977-07-09 ES ES460594A patent/ES460594A1/en not_active Expired
- 1977-09-06 SE SE7709996A patent/SE7709996L/en unknown
- 1977-09-13 BR BR5701127U patent/BR5701127U/en unknown
- 1977-09-13 CH CH1115277A patent/CH622903A5/en not_active IP Right Cessation
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109461A1 (en) * | 1982-11-17 | 1984-05-30 | GebràDer Sulzer Aktiengesellschaft | Rack for storing nuclear fuel elements |
EP0158849A1 (en) * | 1984-04-10 | 1985-10-23 | TRANSNUKLEAR GmbH | Basket for a transport and storage container |
FR2585171A1 (en) * | 1985-07-22 | 1987-01-23 | British Nuclear Fuels Plc | CONTAINER FOR NUCLEAR FUEL ELEMENT |
EP0288837A3 (en) * | 1987-05-01 | 1989-08-09 | Westinghouse Electric Corporation | Basket structure for a nuclear-fuel transportation cask |
FR2650113A2 (en) * | 1988-02-19 | 1991-01-25 | Transnucleaire | Improvement to a rack for storing nuclear fuel elements |
CN102723115A (en) * | 2012-06-29 | 2012-10-10 | 中广核工程有限公司 | Spent fuel storage grillage for nuclear power plant |
CN102723115B (en) * | 2012-06-29 | 2015-12-16 | 中广核工程有限公司 | Spent fuel storage grillwork for nuclear power plant |
Also Published As
Publication number | Publication date |
---|---|
ES460594A1 (en) | 1978-08-16 |
BR5701127U (en) | 1978-05-23 |
NL7707212A (en) | 1978-03-16 |
JPS5343198U (en) | 1978-04-13 |
SE7709996L (en) | 1978-03-15 |
DE7628639U1 (en) | 1976-12-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased | ||
PL | Patent ceased |