EP0748506B1 - Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matieres radioactives - Google Patents

Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matieres radioactives Download PDF

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Publication number
EP0748506B1
EP0748506B1 EP95907034A EP95907034A EP0748506B1 EP 0748506 B1 EP0748506 B1 EP 0748506B1 EP 95907034 A EP95907034 A EP 95907034A EP 95907034 A EP95907034 A EP 95907034A EP 0748506 B1 EP0748506 B1 EP 0748506B1
Authority
EP
European Patent Office
Prior art keywords
base
tube
ferrule
shell
container
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP95907034A
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German (de)
English (en)
French (fr)
Other versions
EP0748506A1 (fr
Inventor
Bernard Kirchner
René CHIOCCA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe pour les Transports de lIndustrie Nucleaire Transnucleaire SA
Original Assignee
Societe pour les Transports de lIndustrie Nucleaire Transnucleaire SA
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Publication date
Application filed by Societe pour les Transports de lIndustrie Nucleaire Transnucleaire SA filed Critical Societe pour les Transports de lIndustrie Nucleaire Transnucleaire SA
Publication of EP0748506A1 publication Critical patent/EP0748506A1/fr
Application granted granted Critical
Publication of EP0748506B1 publication Critical patent/EP0748506B1/fr
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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/12—Closures for containers; Sealing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
    • B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls

Definitions

  • the invention relates to a device for fixing the bottom of a container of transport and / or storage of highly radioactive materials, particular for irradiated nuclear fuel or waste assemblies high activity from their reprocessing.
  • Containers of highly radioactive material generally contain a thick waterproof shielded enclosure intended to achieve containment materials, to stop gamma radiation and to ensure particularly good mechanical resistance, even in situations severe accidental.
  • the main framework of the ferrule and the closures may be formed a thick metal wall with high mechanical resistance, for example a steel, which can reach a thickness of several tens of centimeters; thus for transport and / or storage containers nuclear fuel assemblies or vitrified waste, the ferrule steel can exceed 25 or 30 cm thick, as well as the bottom and main cover, the entire container can weigh empty up to about 120t and full up to 150t or more.
  • radiological shielding provided by the framework can be supplemented by layers of suitable materials arranged outside or inside container, on the ferrule or on the end closures.
  • a weld of this type 7 is long and difficult to perform given large thickness of steel to be welded; it requires care particular and multiple controls being made since it alone ensures the maintenance of the bottom, therefore resistance to falls, and the tightness of the container.
  • the bottom 6 has a diameter exterior equal to that of the shell 1; it has a shoulder 9, practiced on the periphery of its inner face 19, which cooperates with the inner diameter of the ferrule 1 and allows the bottom 6 to be positioned at soft cold friction, partly fitting inside the ferrule, and to lean on the face of the straight end section 10 of said ferrule 1.
  • a peripheral weld bead 11 simpler to realize and check that the previous one keeps the bottom 6 in place. It can be completed by a second weld bead 18 on the internal face.
  • weld bead which ensures the maintaining and sealing the bottom at the ferrule; the welds are highly stressed in the event of the container accidentally falling onto a generator of the ferrule or on a bottom angle. They must therefore, as before, be done with great care and particularly controlled. They represent a weak point that can entail a risk of rupture and thus do not offer a guarantee complete seal in the event of a severe impact.
  • EP 061400 also discloses a closing device container of radioactive material where the seal is only obtained by shrinking the cover (removable) in a ferrule (p.2, 1.37-38 - p.3, 1.30) and due to the absence of defect in the contacting faces (p.4, 1.5-6). It also describes a boss 7 which is located on the ferrule on either side of the sealing faces, which is not in permanent contact with the removable cover and whose size is linked to the expansion of the shell; thus it creates an insufficient obstacle the axial displacement of the cover (p.3, 1.31-32, 35-36, 39).
  • Document FR-A-2092502 corresponding to application DE-A-21 12 579 describes a vacuum seal obtained by hooping, one of the hooped pieces being provided with a cutting edge which deforms during removal.
  • Document EP 101362 also describes a tight closure of a cover removable obtained by hooping of two conical parts, for container transport of radioactive materials; the contact surfaces must be carefully machined (p.2, 1.9-10); the closure has an axial stop and it can also be noted that the cover projects relative to the ferrule.
  • the Applicant has sought to overcome these various drawbacks and to put developed a very safe bottom mounting device which avoids presence of weak points which could lead to risks of rupture or affect the tightness of the container in the event of the container falling, particularly falls in a horizontal or oblique position, which are generally the most severe, but also falls in position vertical, on the bottom or the lid, including falls on a punch.
  • the invention is a device for fixing the bottom of an armored container transport and / or storage of highly radioactive materials including a ferrule and an irremovable base made of thick metal, for example steel, the shell and bottom having respectively an inner wall and a side wall forming a cylinder straight with circular section coming into contact with each other, characterized in that the bottom is held in place by hooping at least part of its side wall by the part from the inner wall of the ferrule facing it, said part of the inner wall of the shell has a counter-shoulder cooperating with a corresponding shoulder practiced in the side wall of the bottom, that the bottom is connected to the shell by a continuous weld bead on its outer face and another on its inner face.
  • Figures 1 and 2 show bottom-shell closures according to art prior.
  • FIG. 3 illustrates a bottom-shell closure according to the present invention and Figures 3a and 3b of the enlarged details of this closing.
  • the bottom-shell closure is final.
  • the device according to the invention ensures the non-displacement of the bottom in relation to the shell, thanks to the shrinking in the event of a fall horizontal, thanks to the counter-shoulder in the event of a vertical fall on the background, and thanks to the cooperation of these two elements in the event of a fall oblique on the bottom.
  • the weld beads which guarantee a perfect helium tightness undergo only weak solicitations, corresponding for example to the rebound in the content of the container in the event of a vertical fall on the lid, and can therefore be of reduced dimensions.
  • a first continuous weld bead usually connects the edge device from the outer face of the bottom to the inner edge of the end face of the ferrule, or possibly the inside face of the ferrule, the bottom recessed thus providing a volume used to the installation for example of an additional neutron shielding incompressible.
  • a second continuous weld bead connects generally the peripheral edge of the internal face from the bottom to the wall internal of the ferrule.
  • cords essentially have the role of guarantee the tightness of the container, in particular to ensure the containment of radioactive material in the container cavity or for avoid contamination during immersion in a swimming pool; they are not not heavily stressed mechanically in the event of a fall, even in the event of vertical or oblique fall on a lower edge of the container, or even when the load contained against the bottom rebounds in the event of a fall on lid.
  • the device of the invention make it possible to reduce significantly the volume (up to -95%) and the size of the welds but still said welds can be satisfied with less demanding specifications; in particular the controls are simplified compared to those practiced on art welds previous, the latter having an essential role in the mechanical strength from the bottom on the shell. It follows an ease of realization and a certain economic advantage.
  • the hooping essentially ensures the absence of play between the bottom and the ferrule, so as to prevent any relative movement between these two parts during falls, and thus to preserve the integrity of the welds. To obtain this result, it is not necessary that the facing surfaces during hooping have a surface condition as neat as that which would be necessary if this hooping were to seal the container. It should be noted that, in the device according to the invention, the weld beads also make it possible to prevent corrosion from settling at the interface between the bottom and the shell, corrosion which could occur when the container is immersed in a swimming pool or following atmospheric condensation and which would damage the bottom-shell connection; in the same way they prevent contamination from slipping into this same interface.
  • the shoulder formed in the internal face of the ferrule, is in contact intimate with a corresponding counter-shoulder in the wall lateral from the bottom; it saves stresses on the welds mainly in the event of a vertical fall on a punch in the center of the bottom; it also allows precise positioning of the bottom relative to the ferrule.
  • the hooping is generally done on the small and the large diameter to get a double hooping. It can also be done only on the small diameter (located towards the container cavity); in both cases it should adjust the height of the bottom shoulder against resting on the shoulder of the ferrule so that its shear strength is sufficient.
  • the forged bottom is substantially located inside the shell, the outer surface of said forged bottom or that of any additional neutron shielding then flush the end of the ferrule; such an arrangement makes it possible to distribute the shock on the bottom and the shell in the event of a vertical fall.
  • the side wall of the bottom has a diameter slightly higher than that of the corresponding interior wall of the ferrule, and the bottom is fitted in the ferrule after these two components were brought to sufficiently different temperatures so that a suitable temporary mounting clearance appears.
  • the outer face of the bottom may advantageously not protrude from the plane comprising the end face of the ferrule, the bottom thus finding it entirely located in the shell.
  • the hooping force develops on the entire side wall of the bottom, or only over part of its thickness, and is sufficient for the hold in place.
  • the hooping is all the more intense as the difference, when cold, between the diameter of the side wall of the bottom and that of the interior wall ferrule correspondent is important. It is however recommended that this difference remains below a limit value beyond which the tensile stresses in the shell and / or compression in the background would exceed the threshold deemed acceptable for the material used.
  • the device according to the invention it is therefore possible to adjust the force of hooping by adjusting the value of the excess outside diameter of the bottom to cold, compared to the inside diameter of the inside wall corresponding to the ferrule also cold.
  • the hoop stress at the interface can be of the order of 100 MPa, perfectly acceptable value for many grades of steel.
  • the container cavity has a cross section not circular, generally machining in the inner wall of the shell, in the part opposite the bottom, so as to obtain, over a certain height, a straight section of the circular shell which will cooperate with the circular side wall of the bottom during hooping.
  • the choice of thick metal to make the shell and the bottom is very varied; it can be guided by the mechanical characteristics, the corrosion resistance, protection against radiation, etc ... if necessary we can take different metals for the bottom and the ferrule.
  • the choice is made among steels (possibly stainless steel), copper and its alloys, for example bronzes, etc.
  • the ferrule can advantageously include handling pins fixed on its outer wall near the bottom and the cover.
  • the pins located towards the bottom are fixed directly to the shell, for example by welding, and in this case the weld does not interfere with other welds contrary to what happens in the prior art (see for example fig. 1 and 2).
  • intersecting welds generally present mutual risks of embrittlement, thus the absence of interference from welding is an additional advantage due to the invention.
  • the device according to the invention comprising a bottom maintained by hooping, is particularly suitable for fixing the bottom of containers of highly radioactive material having walls (bottom and ferrule) very thick in metal, for example in steel, typically ranging from 10 cm to 50 cm (usually 20 to 30 cm) and weighing more than 10t (generally 70 to 150 t).
  • the cooperation of the means implemented in the device according to the invention thus makes it possible to obtain simple containers and therefore economical to produce, meeting the packaging specifications of transport and / or storage, including in a humid environment, and in particular the requirements of international regulations relating to severe accidental fall or shock conditions (including fall horizontal on a generator of the ferrule or oblique on the angle of the shell near the bottom) while being satisfied with lightened controls in course of realization; indeed, during the major impact, none stress does not directly affect the weld seams of the interface bottom ferrule.
  • the device according to the invention is such that the forces applied play during severe shocks or falls does not cause damage to the bottom-ferrule connection, and therefore not only the guarantee but also protection against corrosion and contamination of said bottom-shell interface are improved, and this using a simple manufacturing process using only routine machining or welding operations.
  • FIG. 3 illustrates a container fitted with a non-removable bottom according to the present invention.
  • Figure 3a shows a magnification of the bottom-shell interface.
  • Figure 3b shows the detail of the bottom-shell interface in the particular case where the bottom is set back from the shell.
  • the references 1,2,3,4,5,5,8,10,18,19 have the same meaning as in Figures 1 and 2 of the prior art.
  • the bottom 6 is located inside the shell 1 made of steel, or other resistant metal, has a cylindrical peripheral side wall 12 of circular section which is enclosed over its entire height by an identical cylindrical part 13 machined in the inner wall 20 of the shell 1; in the case of the figure the outer face 14 of the bottom 6 does not protrude from the plane comprising the end face 10 of the ferrule 1. The bottom 6 is thus held in place by shrinking with the help of the ferrule 1 itself even.
  • the cavity 22 of the container can have such a shape (for example at polygonal cross section) that its inner wall 20 requires counterbore 21- (fig.3a) for setting up the bottom while for other shapes of the cavity 22 (for example with a circular cross section) the counterbore is not not necessary (see fig. 3 in 18a).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Stackable Containers (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Welding Or Cutting Using Electron Beams (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Measurement Of Radiation (AREA)
EP95907034A 1994-02-01 1995-01-13 Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matieres radioactives Expired - Lifetime EP0748506B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9401313 1994-02-01
FR9401313A FR2715762B1 (fr) 1994-02-01 1994-02-01 Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matières radioactives.
PCT/FR1995/000043 WO1995021449A1 (fr) 1994-02-01 1995-01-13 Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matieres radioactives

Publications (2)

Publication Number Publication Date
EP0748506A1 EP0748506A1 (fr) 1996-12-18
EP0748506B1 true EP0748506B1 (fr) 1999-09-08

Family

ID=9459821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95907034A Expired - Lifetime EP0748506B1 (fr) 1994-02-01 1995-01-13 Dispositif de fixation du fond d'un conteneur de transport et/ou stockage de matieres radioactives

Country Status (10)

Country Link
US (1) US5567952A (enrdf_load_stackoverflow)
EP (1) EP0748506B1 (enrdf_load_stackoverflow)
JP (1) JPH09508472A (enrdf_load_stackoverflow)
CZ (1) CZ288522B6 (enrdf_load_stackoverflow)
DE (1) DE69512035T2 (enrdf_load_stackoverflow)
ES (1) ES2137492T3 (enrdf_load_stackoverflow)
FR (1) FR2715762B1 (enrdf_load_stackoverflow)
TW (1) TW285741B (enrdf_load_stackoverflow)
WO (1) WO1995021449A1 (enrdf_load_stackoverflow)
ZA (1) ZA95700B (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6410255B1 (en) * 1999-05-05 2002-06-25 Aurora Biosciences Corporation Optical probes and assays
JP2003523769A (ja) * 2000-02-23 2003-08-12 ヴァーテックス ファーマシューティカルズ （サンディエゴ）エルエルシー 改変された蛍光タンパク質
EP1193720B1 (en) * 2000-04-25 2017-01-11 Japan Casting & Forging Corporation Billet for a radioactive substance containment vessel producing method
AU2002315157A1 (en) * 2001-06-14 2003-01-02 Anadys Pharmaceuticals, Inc. Methods of screening for ligands of target molecules
US7858044B2 (en) 2003-04-30 2010-12-28 Nexus Biosystems, Inc. Multi-well plate providing a high-density storage and assay platform
US7619059B2 (en) 2003-07-29 2009-11-17 Life Technologies Corporation Bimolecular optical probes
US7727752B2 (en) 2003-07-29 2010-06-01 Life Technologies Corporation Kinase and phosphatase assays
CA2445420A1 (en) 2003-07-29 2005-01-29 Invitrogen Corporation Kinase and phosphatase assays
US8437444B2 (en) * 2005-01-13 2013-05-07 Nac International, Inc. Apparatus and methods for achieving redundant confinement sealing of a spent nuclear fuel canister
FR2935532B1 (fr) * 2008-08-27 2012-07-13 Tn Int Procede de fabrication d'un emballage pour le transport et/ou stockage de matieres nucleaires, utilisant le phenomene de retrait de soudage.
TWI368131B (en) 2010-01-26 2012-07-11 Compal Electronics Inc Notebook computer
DE102012101300B3 (de) * 2012-02-17 2013-04-18 Nuclear Cargo + Service Gmbh Verschlusseinrichtung für Behälter zum Transport radioaktiver Stoffe
CN109659059A (zh) * 2019-01-02 2019-04-19 中国核电工程有限公司 处理放射性废物的装置、系统、方法及应用

Family Cites Families (14)

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DE154316C (enrdf_load_stackoverflow) *
US2348696A (en) * 1941-09-19 1944-05-09 Erie Enameling Company Method of forming tanks
NL7004578A (enrdf_load_stackoverflow) * 1970-04-01 1971-10-05
US4133094A (en) * 1977-08-22 1979-01-09 Chicago Bridge & Iron Company Method of joining a tank and skirt support together
FR2472819A3 (fr) * 1979-11-08 1981-07-03 Kernforschungsz Karlsruhe Dispositif de fermeture pour conteneur de stockage rempli de verre fondu radioactif
DD154316A1 (de) * 1980-11-13 1982-03-10 Ilona Micklisch Behaelter zur lagerung und zum transport von brennstoffkassetten
FR2502379A1 (fr) * 1981-03-20 1982-09-24 Novatome Ind Procede et dispositif de fermeture etanche amovible d'un conteneur pour combustible irradie
FR2531404B1 (fr) * 1982-08-06 1986-06-06 Commissariat Energie Atomique Procede et dispositif de fermeture etanche d'un conteneur par frettage de deux portees coniques
DE3325119A1 (de) * 1983-07-12 1985-01-24 Deutsche Gesellschaft für Wiederaufarbeitung von Kernbrennstoffen mbH, 3000 Hannover Behaelter zum lagern von radioaktiven stoffen
US4633091A (en) * 1984-10-12 1986-12-30 Westinghouse Electric Corp. Container for the storage, transportation and ultimate disposal of low level nuclear wastes
DE3542176A1 (de) * 1985-11-29 1987-06-04 Vaw Ver Aluminium Werke Ag Fluessigkeitsbehaelter aus einer aluminium-gusslegierung
EP0343410A3 (en) * 1988-05-24 1990-05-16 Westinghouse Electric Corporation Shipping cask for nuclear fuel
US5094801A (en) * 1990-01-22 1992-03-10 The Babcock & Wilcox Company Two piece pressurizer heater sleeve
FR2702875B1 (fr) * 1993-03-15 1995-06-16 Framatome Sa Procede et dispositif de remplacement d'un adaptateur de traversee du couvercle de la cuve d'un reacteur nucleaire.

Also Published As

Publication number Publication date
TW285741B (enrdf_load_stackoverflow) 1996-09-11
FR2715762B1 (fr) 1996-03-29
JPH09508472A (ja) 1997-08-26
WO1995021449A1 (fr) 1995-08-10
DE69512035D1 (de) 1999-10-14
CZ288522B6 (cs) 2001-07-11
FR2715762A1 (fr) 1995-08-04
CZ225896A3 (en) 1996-11-13
ZA95700B (en) 1996-02-08
DE69512035T2 (de) 2000-03-16
US5567952A (en) 1996-10-22
ES2137492T3 (es) 1999-12-16
EP0748506A1 (fr) 1996-12-18

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