EP0143033B1 - Abschirmbehälter für Transport und Lagerung von radioaktiven Materialien - Google Patents

Abschirmbehälter für Transport und Lagerung von radioaktiven Materialien Download PDF

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Publication number
EP0143033B1
EP0143033B1 EP19840402121 EP84402121A EP0143033B1 EP 0143033 B1 EP0143033 B1 EP 0143033B1 EP 19840402121 EP19840402121 EP 19840402121 EP 84402121 A EP84402121 A EP 84402121A EP 0143033 B1 EP0143033 B1 EP 0143033B1
Authority
EP
European Patent Office
Prior art keywords
constituent part
container
load
inner cylinder
constituent
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
Application number
EP19840402121
Other languages
English (en)
French (fr)
Other versions
EP0143033A1 (de
Inventor
Gérard Chevalier
Bernard Liot
Christian Phalippou
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0143033A1 publication Critical patent/EP0143033A1/de
Application granted granted Critical
Publication of EP0143033B1 publication Critical patent/EP0143033B1/de
Expired legal-status Critical Current

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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
    • G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal

Definitions

  • the invention relates to the transport and storage of a radioactive load, in particular that consisting of fuel assemblies irradiated in nuclear reactors, and relates more precisely to a new type of container designed so that each of its constituent parts contributes, in association with others, with the optimal solution of all the problems without exception raised by these operations of transport and storage, including in the event of accidents.
  • the architecture of known containers essentially comprises, on the one hand, a first cylindrical constituent part closed at its ends, containing in its longitudinal central cavity the radioactive charge, ensuring most of the protection against radiation y and l evacuation of the thermal power released by the load and, on the other hand and surrounding this first part, a second constitutive mixed cylindrical part comprising, internally, means ensuring both protection against neutron radiation and the transfer of thermal power outwards and, externally, means for dissipating this thermal power, such as fins.
  • the invention relates to a container of the above kind but also having additional and associated characteristics allowing it both to improve all the performance of these known containers and to have in addition a specific resistance to fire and shock effects.
  • a container according to the preamble of claim is known from patent FR-A-2 179 672.
  • the main object of the invention is therefore an armored container for the transport and storage of a radioactive load as claimed in the claim.
  • the two cylindrical parts are adjusted to each other in order to carry out the just sliding assembly of the external cylindrical part outside of the internal cylindrical part.
  • the two cylindrical parts to be adjusted between them have a minimal taper, of the order of 1%, facilitating this mounting.
  • the internal part of the container which is more massive and warmer, increases in external diameter more than does the second external coaxial part, so that a self-effect is obtained. hooping reinforcing the mechanical cohesion of the assembly of the two parts which makes it more resistant to shocks, and thus thereby increases the characteristics of transmission of heat flow in a centrifugal manner.
  • its second constituent part is specially designed to have maximum longitudinal stiffness and optimal transverse flexibility.
  • a container according to the invention is further characterized in that, on the one hand, the material chosen to produce the metallic elements of the second constituent part of the container is mechanically ductile spheroidal graphite cast iron, and d 'other hand, the two coaxial cylinders of said second part are interconnected by longitudinal spacers having in section a circular arc profile tangentially joining the facing surfaces of the two said coaxial cylinders.
  • the external part of the container has a great possibility of mechanical deformation with respect to the internal part of the container.
  • the deformable external part is designed to absorb the major part of the kinetic energy developed so as to limit the deceleration undergone to a value such that the integrity of the container is ensured.
  • the invention also relates to other interesting accessory characteristics.
  • the container described is intended to transport and store a radioactive load.
  • This charge is constituted, in this example, by seven fuel assemblies 1, previously irradiated in a nuclear reactor, and placed in a basket 2, known per se, produced in the form of a light alloy matrix maintaining the different parallel fuel assemblies between them and spaced radially evenly.
  • This basket 2 is placed inside a longitudinal central cavity of the first constituent part of the container formed by a body 3.
  • This body 3 is a thick cylinder, axially hollow, made of cast or forged steel, or even of spheroidal graphite cast iron, and having a bottom 4.
  • the functions of this body 3 are as follows: ensuring the integrity of the objects transported, create a containment barrier for enclosed radioactive materials; provide essential protection against y radiation; and ensuring the thermal transfer to the outside of the thermal power released by the radioactive materials placed in the basket.
  • the body 3 is closed by a closure system comprising a plug 5, fixed by bolts 6 to the flange of the body 3 with the interposition of two seals 7.
  • the plug 5 has the same functions as the body 3.
  • a tape consisting of a closure plate 8 constitutes a device for closing the plug 5 in addition to ensuring frontal functions of mechanical and biological protection, and sealing.
  • This plate 8 encloses accidental contamination during the opening or closing operations of the container. It is fixed with bolts 9 to the flange of the body 3.
  • a seal 10 is interposed between the plate 8 and the flange of the body 3.
  • a seal 10 is interposed between the plate 8 and the flange of the body 3.
  • the second constituent part of the container or external part 11 which will be described in more detail below, has been characteristically designed according to the invention to simultaneously fulfill all of the following functions: providing additional biological protection against y radiation; provide the essential biological protection against neutron radiation; ensuring the optimal release of the thermal power released by the radioactive materials in the load; provide a safety damping capacity for mechanical shocks to the container under normal operating conditions and also accidental; and, finally, ensuring the thermal protection of the load against the effects of fire.
  • This external part essentially comprises, radially surrounding the active parts of the fuels contained in the central parts of the assemblies 1, two spaced coaxial cylinders 12 and 13, enclosing between them a material 14 such as plaster loaded with hydrogenated materials absorbing neutron radiation, interconnected by spacers 15 ensuring centrifugal thermal transfer, and externally provided with longitudinal fins 16 for heat dissipation.
  • a material 14 such as plaster loaded with hydrogenated materials absorbing neutron radiation
  • the internal cylinder 12 is mounted without mechanical play around the external cylindrical surface of the body 3, the two parts being at ambient temperature.
  • the two cylindrical parts 3 and 12 to be adjusted between them have a difference in diameters allowing the assembly of the external cylindrical part 12 to be carried out without problem outside the body 3.
  • the two internal 3 and external 11 cylindrical parts to be adjusted between them have a minimal taper, of the order of 1%, facilitating assembly.
  • the container of which it is the object is characterized in that the material chosen to produce the metallic elements of its external part is spheroidal graphite cast iron and that the two coaxial cylinders 12 and 13 are interconnected by longitudinal spacers 15 having in section, as shown in FIG. 2, a circular arc profile tangentially joining the facing surfaces of the cylinders 12 and 13.
  • the series of interior volumes between the cylinders 12 and 13 and formed by the internal spacers 15 is perfectly suited to contain the neutron protection material 14 necessary for the type of radioactive charge provided.
  • outer fins 16 can also have an oblique, helical or perpendicular direction relative to the longitudinal axis of the container or a herringbone shape, to optimize their bending behavior.
  • the honeycomb and fin structure is enclosed beforehand inside a protective skirt 17 mounted on suitable supports 18 on the part and on the other side of this structure which axially positions the external part 11.
  • This skirt can be filled, prior to its immersion in a swimming pool, with uncontaminated water to ensure the thermal connection between the fins 16 of the container and the ambient medium.
  • Trunnions 19 protruding radially outside allow the handling and securing of the container while ensuring significant damping in the event of a fall.
  • covers 20 arranged at the two ends of the container and which constitute mechanical protection screens against any axial or lateral shock and thermal protection protecting the seals 7 and 10 of the closure elements of the container in the event of 'fire.
  • covers 20 can be made of balsa wood.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Buffer Packaging (AREA)
  • Packages (AREA)

Claims (4)

1. Abschirmbehälter für den Transport und die Lagerung einer radioaktiven Ladung, bestehend aus einem Material, dass Gammastrahlen absorbiert und die von der Ladung abgegebene thermische Energie nach aussen, enthaltend: eine erste, dicke Hülle, die die Ladung in einem längslaufenden, mittleren Hohlraum einschliesst, und einem zweiten Bestandteil (11) aus zwei koaxialen, im Abstand angeordneten Zylindern, die zwischen sich ein Neutronenstrahlung absorbierendes Material einschliessen, untereinander durch Wärmeleiteinrichtungen (15) verbunden sind und nach aussen mit Wärmeabstrahlrippen (16) versehen sind, ein Zwischenraum, der eine Luftschicht (1) bildet, die eine thermische Isolation bewirkt, die auftritt, wenn der Behälter offenem Feuer ausgesetzt ist, dadurch gekennzeichnet, dass wenn sich die ersten und zweiten Bestandteile auf Umgebungstemperatur befinden, der innere Zylinder (12) des zweiten Bestandteils (11) ohne mechanisches Spiel am ersten Bestandteil (3) montiert ist, und dass im Laufe der normalen Funktion des Behälters bei radioaktiver Ladung im längserstreckten mittleren Hohlraum desselben der innere Zylinder (12) des zweiten Bestandteils (11) mit Spannung auf dem ersten Bestandteil (3) gehalten ist, dass der genannte, eine Luftschicht (1 ) bildende Zwischenraum zwischen dem inneren Zylinder (12) und dem ersten Bestandteil (3) auftritt, und dass die zwei koaxialen Zylinder (12 und 13), die Wärmeleiteinrichtungen (15) und die Rippen (16) als einstückiges Gussstück aus sphäroidischem Graphit gegossen sind.
2. Abschirmbehälter nach Anspruch 1, dadurch gekennzeichnet, dass der innere Zylinder (12) des zweiten Bestandteils (11 ) des Behälters eine schwache Konizität aufweist und dass die Aussenfläche des ersten Bestandteils die gleiche Konizität hat.
3. Abschirmbehälter nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Wärmeleiteinrichtungen (15) von längslaufenden Stegen gebildet sind, die ein kreisbogenförmiges Querschnittsprofil haben, das sich tangential mit den Flächen der zwei koaxialen Zylinder (12 und 13) vereinigt.
4. Abschirmbehälter nach Anspruch 1, dadurch gekennzeichnet, dass sein zweiter Bestandteil (11) im Innern einer Schutzhülle (17) eingeschlossen sein kann.
EP19840402121 1983-10-24 1984-10-22 Abschirmbehälter für Transport und Lagerung von radioaktiven Materialien Expired EP0143033B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8316914 1983-10-24
FR8316914A FR2553922B1 (fr) 1983-10-24 1983-10-24 Conteneur blinde pour le transport et le stockage d'un chargement radioactif

Publications (2)

Publication Number Publication Date
EP0143033A1 EP0143033A1 (de) 1985-05-29
EP0143033B1 true EP0143033B1 (de) 1988-03-09

Family

ID=9293452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840402121 Expired EP0143033B1 (de) 1983-10-24 1984-10-22 Abschirmbehälter für Transport und Lagerung von radioaktiven Materialien

Country Status (4)

Country Link
EP (1) EP0143033B1 (de)
JP (1) JPS60111199A (de)
DE (1) DE3469817D1 (de)
FR (1) FR2553922B1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE791334A (fr) * 1971-11-15 1973-03-01 Lemer & Cie Dispositif perfectionne pour le refroidissement par air de chateau de transport de produits radioactifs
US3882315A (en) * 1973-04-12 1975-05-06 Mallinckrodt Chemical Works Shipping container for a bottle of radioactive material
DE7727690U1 (de) * 1977-09-07 1977-12-22 Steag Kernenergie Gmbh, 4300 Essen Abschirmtransport- und/oder abschirmlagerbehaelter fuer radioaktive abfaelle
DE2915376C2 (de) * 1979-04-14 1984-02-02 Transnuklear Gmbh, 6450 Hanau Behälterkombination für den Transport und die Lagerung bestrahlter Brennelemente aus Kernreaktoren
DE3148528A1 (de) * 1980-12-22 1982-07-15 Steag Kernenergie Gmbh, 4300 Essen Vorrichtung zur aufbewahrung von radkoaktivem material

Also Published As

Publication number Publication date
EP0143033A1 (de) 1985-05-29
DE3469817D1 (en) 1988-04-14
JPS60111199A (ja) 1985-06-17
FR2553922A1 (fr) 1985-04-26
FR2553922B1 (fr) 1988-10-07

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