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Publication numberUS3859533 A
Publication typeGrant
Publication dateJan 7, 1975
Filing dateNov 15, 1973
Priority dateDec 21, 1972
Also published asDE2361363A1, DE2361363B2
Publication numberUS 3859533 A, US 3859533A, US-A-3859533, US3859533 A, US3859533A
InventorsSuvanto Antti
Original AssigneeAsea Atom Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Storing device for fuel assemblies
US 3859533 A
Abstract
A storing device for fuel assemblies includes a supporting grid with a substantially square lattice and a plurality of tubes of substantially square cross-section each adapted to contain one fuel assembly. There are retaining devices for holding tubes in position with respect to the grid. The walls of the tubes are coated with absorbing material. Each of the retaining devices is arranged to hold a pair of mutually parallel walls of different tubes having a gap between them, with the walls crossing a side of the lattice. The gap contains a layer of absorbing material, and is sealed water-tightly at the top and bottom portions of the gap.
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Description  (OCR text may contain errors)

'1 Umtd States atent 11 3,859,533 Suvanto Jan. 7, 1975 [54] STORING DEVICE FOR FUEL ASSEMBLIES 3,229,096 1/1966 Bonilla et al 250/507 I t A t y d [75] nven or ntti Suvanto, Vas eras Swe en Primary Examiner Hamld A. Dixon [73] Assignee: AB Asea-Atom, Vasteras, Sweden [22] Filed: Nov. 15, 1973 ABSTRACT [211 App] No 416 182 A storing device for fuel assemblies'includes a supporting grid with a substantially square lattice and a plurality of tubes of substantially square cross-section Foreign Application i y Data each adapted to contain one fuel assembly. There are Dec, 21, 1972 Sweden 16779/72 retaining devices for holding tubes in position with respect to the grid. The walls of the tubes are coated [52] US. Cl. 250/507, 250/518 h ing m eri l. Each of the retaining devices [51] Int. Cl. G21f 5/00 i nged to hold a pair of mutually parallel walls of [58] Field of Search 250/506, 507,515, 518 different tubes h ing a gap w n h m, wi h h walls crossing a side of the lattice, The gap contains a [56] References Cited layer of absorbing material, and is sealed water-tightly UNITED STATES PATENTS at the top and bottom portions of the gap. 3,119,933 1/1964 Allen 250/507 1 Claim, 2 Drawing Figures Patented Jan. 7, 1975 3,859,533

Fig.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present patent application relates to a storing device for fuel assemblies.

2. The Prior Art Storing devices for fuel assemblies are usually constructed with assembly positions so thinly distributed that there is no risk of criticality. This, however, requires a relatively large distance between the assemblies and, as the required number of storing positions is great, about 1,000 to a medium-sized reactor station, the space which is needed for fuel storage will be considerable.

The assemblies can be placed close to each other if a sufficient amount of absorbing material of penetrating radiation is placed between the assemblies. Most of the absorbing materials must be encapsuled in order not to be dissolved or corroded by the water. The materials which can be used uncapsuled, for example hafnium, are very expensive.

SUMMARY OF THE INVENTION In the device according to the invention, the storing tubes are assembled in such a way that a space which is necessary for absorbing materials is formed between the tubes when they are put together into a unit. The construction consists of square tubes which are provided with absorbing material all around them. Application of the absorbing layer can be performed by metal spraying, by electrolysis or in the form of thin sheet or foil. The gaps between adjacent tubes are sealed by welding at top and bottom. The sides of the construction which do not face other tubes are provided with cover plates welded to the upper and lower edges of the tubes. The units can be so small as 4 to 8 positions but can also comprise all 1,000 positions. Units which are very large, however, are impractical from the point of view of handling and prefabrication.

Furthermore, according to the invention, a grid is provided which is formed of upstanding wall portions crossing each other, with notches between the tubereceiving portions, in which the walls of adjacent tubes engage with a space between them which is filled with absorbing medium. The spaces are sealed at top and bottom by valves or the like.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described with reference to the accompanying drawing in which FIG. 1 shows a device according to the invention in horizontal section along the line I I of FIG. 2, and FIG. 2 shows a vertical section of the same device along the line IIII of FIG. 1, FIG. 1 showing the storing device without fuel assemblies and FIG. 2 with fuel assemblies.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawing, 1 designates a supporting grid which is constituted by a plurality of sheet elements 2 resting on their ends and crossing each other and welded together. The supporting grid 1 is supported by a plurality of supporting studs 3 which are arranged on the floor of the fuel basin. A number of storing tubes 4 are positioned on the supporting grid 1, which is provided with retaining means of such a nature that accurate positions are ensured for the tubes. The retaining means in a simple form consist of notches 5 in the sheet element 2. In each notch 5 the width is such that two parallel tubular walls 6 and 7, belonging to two different storing tubes with an intermediary gap 8 for absorbing material, can be inserted into the notch 5. The gaps 8 are sealed at the upper and lower edges by the welding seams 9 and 10, which, together with a cover plate surrounding the whole storing device, ensures a watertight enclosure of the absorbing material arranged between the storing tubes.

The sheet elements 2 are made with oblique control edges 11, which results in a centering of each fuel assembly 12 with respect to the corresponding storing tubes.

I claim:

1. Storing device for fuel assemblies of substantially square cross-section, comprising a supporting grid (1) with a substantially square lattice, a plurality of tubes (4), the tubes having substantially square cross section and being adapted to contain one fuel assembly each, a plurality of retaining means (5) for holding said tubes in position with respect to said supporting grid, an absorbing material (8) coating the walls of said tubes, each of said retaining means (5) being adapted to hold a pair (6, 7) of mutually parallel walls belonging to dif ferent tubes and arranged with a gap (8) between them, said walls crossing a side of said lattice, said gap containing a layer of absorbing material, the gap between said walls being sealed water-tightly at the top and bottom portions of said gap.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3119933 *May 3, 1960Jan 28, 1964Stanray CorpContainer for transporting thermally hot intensely radioactive material
US3229096 *Apr 3, 1963Jan 11, 1966Nat Lead CoShipping container for spent nuclear reactor fuel elements
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4004154 *Mar 17, 1975Jan 18, 1977Combustion Engineering, Inc.Fissionable mass storage device
US4006362 *Nov 17, 1975Feb 1, 1977Brooks & Perkins, IncorporatedShroud for storing radioactive spent nuclear fuel cells
US4010375 *May 27, 1975Mar 1, 1977Wachter William JStorage rack for nuclear fuel assemblies
US4024406 *Feb 17, 1976May 17, 1977Combustion Engineering, Inc.Spent fuel storage improvement
US4029968 *Sep 11, 1975Jun 14, 1977Nuclear Services CorporationStacked racks for storing spent nuclear fuel elements
US4034227 *Feb 2, 1976Jul 5, 1977Olaf SootNuclear fuel storage rack
US4039842 *Jan 8, 1976Aug 2, 1977Brooks & Perkins, IncorporatedFuel storage rack
US4044267 *Mar 26, 1976Aug 23, 1977Combustion Engineering, Inc.Fissionable mass storage device
US4063999 *Jan 28, 1976Dec 20, 1977Westinghouse Electric CorporationNuclear fuel storage arrangement
US4088897 *Jan 19, 1977May 9, 1978Olaf SootNuclear fuel storage rack
US4096392 *Jul 11, 1975Jun 20, 1978Nuclear Services CorporationRack for storing spent nuclear fuel elements
US4177386 *May 26, 1978Dec 4, 1979Robbins Thomas RMethod and apparatus for storing nuclear fuel assemblies in maximum density racks
US4203038 *Oct 26, 1977May 13, 1980Hitachi, Ltd.High density spent fuel storage rack
US4219735 *Dec 23, 1976Aug 26, 1980Transnucleaire, Societe Pour Les Transports De L'industrie NucleaireContainer for the transportation of irradiated fuel elements and handling device adapted therefor
US4248668 *Mar 13, 1978Feb 3, 1981General Electric CompanyStorage module for nuclear fuel assemblies
US4382060 *May 22, 1980May 3, 1983Joseph Oat CorporationMade of neutron shield cruciform elements
US4441242 *May 29, 1981Apr 10, 1984Westinghouse Electric Corp.Spent fuel consolidation system
US4567015 *Mar 7, 1983Jan 28, 1986Sulzer Brothers LimitedFrame for storing nuclear fuel elements
US4610893 *Dec 19, 1984Sep 9, 1986Asea AktiebolagMethod of manufacturing an absorber plate for a boiling water reactor
US4746487 *Jun 10, 1981May 24, 1988U.S. Tool & Die, Inc.Storage rack for nuclear fuel assemblies
US4780268 *Jun 13, 1984Oct 25, 1988Westinghouse Electric Corp.Neutron absorber articles
US4781883 *Jul 17, 1987Nov 1, 1988Westinghouse Electric Corp.Elongated rectangular cells enclosure containers in matrix of slots; long term use
US4788030 *May 28, 1987Nov 29, 1988Sulzer Brothers LimitedSpacer strips secured to tubes defining seal-tight chambers with releasable covers; earthquake resistance
US4857263 *Nov 30, 1987Aug 15, 1989Westinghouse Electric Corp.Storage of spent nuclear fuel
US4908515 *Dec 10, 1987Mar 13, 1990Nus CorporationMethod of efficiently storing spent nuclear fuel rods in a cylindrical container
US4960560 *Dec 11, 1989Oct 2, 1990Westinghouse Electric Corp.Spent fuel storage rack for BWR fuel assemblies
US5245641 *Oct 26, 1989Sep 14, 1993Westinghouse Electric Corp.Spent fuel storage rack
US6665365Aug 30, 2001Dec 16, 2003Societe Pour Les Transports De L'industrie Nucleaire-TransnucleaireStorage container for radioactive materials
US7295646Sep 27, 1999Nov 13, 2007Metallveredlung Gmbh & Co. KgMethod for producing a coating for absorption of neutrons produced in nuclear reactions of radioactive materials
DE2629363A1 *Jun 30, 1976Jan 5, 1978Noell GmbhLagergestell zur aufnahme gebrauchter brennelemente fuer kernkraftwerke
DE2822397A1 *May 23, 1978Sep 27, 1979Gen ElectricLagermodul fuer kernbrennstoff-baueinheiten
DE2943459A1 *Oct 27, 1979May 7, 1981Nukem GmbhLagergestell fuer waermeproduzierende stoffe
DE3004274A1 *Feb 6, 1980Aug 13, 1981Noell GmbhMittel zum festlegen gebrauchter brennelemente aus kernkraftwerken in kammern eines lagergestells
EP0002227A1 *Nov 21, 1978Jun 13, 1979The Carborundum CompanyNeutron absorbing articlem neutron absorbing plate and use of said plate as well as method for manufacture of such article
Classifications
U.S. Classification376/272, 976/DIG.276
International ClassificationG21C19/00, G21C19/40
Cooperative ClassificationG21C19/40
European ClassificationG21C19/40