EP0143033A1 - 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
EP0143033A1
EP0143033A1 EP84402121A EP84402121A EP0143033A1 EP 0143033 A1 EP0143033 A1 EP 0143033A1 EP 84402121 A EP84402121 A EP 84402121A EP 84402121 A EP84402121 A EP 84402121A EP 0143033 A1 EP0143033 A1 EP 0143033A1
Authority
EP
European Patent Office
Prior art keywords
container
inner cylinder
load
constituent part
component part
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.)
Granted
Application number
EP84402121A
Other languages
English (en)
French (fr)
Other versions
EP0143033B1 (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 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 for these purposes, and according to a first functional originality of a container according to the invention, it has thermal conduction characteristics between its two constituent parts which are maximum when the heat flow is centrifugal (normal conditions, when the.- radioactive loading releases thermal power) and minimum when this flow is centripetal (abnormal conditions, when the container is accidentally located in a fire).
  • the main object of the invention is therefore an armored container for the transport and storage of a radioactive load, made of a material absorbing the radiation there and discharging towards the outside the thermal power released by the load, essentially comprising a first part comprising a thick cylindrical constitutive envelope, containing the load in a longitudinal central cavity, and a second constitutive part comprising two spaced coaxial cylinders, enclosing between them a material absorbing the neutron radiation, connected together by means of thermal conduction, and provided with the outside of heat dissipation means, characterized in that, when the first and second constituent parts are at ambient temperature, the internal cylinder of the second constituent part is mounted without mechanical play on the first constituent part, in that, during normal container operation, a radioa load ctif being present in said longitudinal central cavity, the inner cylinder of the second component part is mounted with a clamping on the first component part, and in that, the container being caught in a fire, there is a clearance between the inner cylinder and the first component part to form an air space
  • the two cylindrical parts are adjusted together in order to perform just sliding mounting of the external cylindrical part outside 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 mounting of the two essential constituent parts of the container forms a compact mechanical assembly.
  • 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 one obtains a self-hooping effect reinforcing the mechanical cohesion of the assembly of the two parts, which makes it more resistant to shocks, and thereby thereby increases the characteristics of transmission of the 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 on the other hand, the two coaxial cylinders of said second part are interconnected by longitudinal spacers having in section a circular arc profile tangentially connecting to 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 most of the kinetic energy developed so as to limit the deceleration suffered 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 comprising 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 an iron-system - meture comprising a cap 5, fixed by bolts 6 to the flange of the body 3 with the interposition of two gaskets 7.
  • the stopper 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 body flange 3.
  • a seal 10 is interposed between the plate 8 and the body flange 3.
  • a gasket 10 is interposed between the plate 8 and the collar 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; ensure optimal evacuation of the thermal power released by the radioactive materials in the load; ensure security damping capacity mechanical shocks to the container under operating conditions norma - and also the 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 heat 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, cam 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)
  • Packages (AREA)
  • Buffer Packaging (AREA)
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 true EP0143033A1 (de) 1985-05-29
EP0143033B1 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)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2179672A2 (de) * 1971-11-15 1973-11-23 Lemer & Cie
US3882315A (en) * 1973-04-12 1975-05-06 Mallinckrodt Chemical Works Shipping container for a bottle of radioactive material
GB2003782A (en) * 1977-09-07 1979-03-21 Steag Kernenergie Gmbh Iner for radioactive wastes shielded transport container and/or shielded storage conta
FR2454158A1 (fr) * 1979-04-14 1980-11-07 Transnuklear Gmbh Combinaison de recipients pour le transport et le stockage de dechets radioactifs, en particulier d'elements combustibles irradies de reacteurs nucleaires
EP0054944A1 (de) * 1980-12-22 1982-06-30 STEAG Kernenergie GmbH Vorrichtung zur Aufbewahrung von radioaktivem Material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2179672A2 (de) * 1971-11-15 1973-11-23 Lemer & Cie
US3882315A (en) * 1973-04-12 1975-05-06 Mallinckrodt Chemical Works Shipping container for a bottle of radioactive material
GB2003782A (en) * 1977-09-07 1979-03-21 Steag Kernenergie Gmbh Iner for radioactive wastes shielded transport container and/or shielded storage conta
FR2454158A1 (fr) * 1979-04-14 1980-11-07 Transnuklear Gmbh Combinaison de recipients pour le transport et le stockage de dechets radioactifs, en particulier d'elements combustibles irradies de reacteurs nucleaires
EP0054944A1 (de) * 1980-12-22 1982-06-30 STEAG Kernenergie GmbH Vorrichtung zur Aufbewahrung von radioaktivem Material

Also Published As

Publication number Publication date
FR2553922B1 (fr) 1988-10-07
JPS60111199A (ja) 1985-06-17
EP0143033B1 (de) 1988-03-09
DE3469817D1 (en) 1988-04-14
FR2553922A1 (fr) 1985-04-26

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