EP0082483A1 - Festes Produkt von radioaktiven Abfällen zur Beseitigung derselben - Google Patents

Festes Produkt von radioaktiven Abfällen zur Beseitigung derselben Download PDF

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Publication number
EP0082483A1
EP0082483A1 EP82111669A EP82111669A EP0082483A1 EP 0082483 A1 EP0082483 A1 EP 0082483A1 EP 82111669 A EP82111669 A EP 82111669A EP 82111669 A EP82111669 A EP 82111669A EP 0082483 A1 EP0082483 A1 EP 0082483A1
Authority
EP
European Patent Office
Prior art keywords
layer
radioactive waste
solidified
water
glass fiber
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.)
Withdrawn
Application number
EP82111669A
Other languages
English (en)
French (fr)
Inventor
Shin Tamata
Susumu Horiuchi
Mikio Hirano
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0082483A1 publication Critical patent/EP0082483A1/de
Withdrawn legal-status Critical Current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
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/34—Disposal of solid waste
    • G21F9/36—Disposal of solid waste by packaging; by baling

Definitions

  • This invention relates to a solidified product for the disposal of radioactive wastes produced at nuclear power plants, etc., and more particularly it relates to a solidified product of radioactive waste for disposal incorporating an improvement to the conventional solidified coating of a mass of radioactive waste packed in a container.
  • radioactive waste has been encapsulated in a solidifying material such as cement, plastic, asphalt, etc., and is then placed in a drum to form a solidified product of radioactive waste for the disposal thereof.
  • This encapsulated product because of its nature, tends to become porous when solidified, so that, in view of this water perviousness, it is inevitable that the ratio of waste being treated to the solidifying covering material is limited when forming this product. This cannot meet the demands of volume reduction in the disposal of a large quantity of radioactive waste such as that produced at a nuclear power plant.
  • the present invention has the object of providing a solidified product of radioactive waste for the disposal thereof, by which the volume of radioactive waste that can be treated when forming a solidified mass confined in a container can be increased by an inexpensive means.
  • the radioactive waste being treated is first coated with a layer of an inorganic or organic material which is solidified, the surface of this solidified layer is then covered with a water-impervious layer, and the thus coated mass of radioactive waste is placed in a sealed container.
  • the present invention is characterized by the formation of a water-impervious layer on the surface of a solidified layer to ensure a complete prevention of the leakage of radioactive material due to the penetration of water while allowing a substantial reduction in the thickness of the coating layer itself.
  • plastic is the most desirable from the aspect of volume reduction, but cement is highly valued from the safety viewpoint based on the results of practical use in many fields.
  • the present invention also makes it possible to use even an inorganic material such as an alkali silicate solution as the solidifying agent which is more stable and has higher volume-reducing ability than the above conventional materials, while avoiding an increase of the thickness of the coating due to the porous property of the material to allow a highly efficient and compact packing of the waste material.
  • the solidifying agent adheres in the form of a thin film to the inner surface of the container 1 by virtue of centrifugal force to form a layer 2.
  • the layer 2 can maintain this thin film-like state for a certain period of time because of the viscosity of the solidifying agent.
  • a layer of glass fiber 3 impregnated with the alkali silicate solution is laid on the surface of the film-like layer of solidifying agent 2 before the solidifying agent sets completely.
  • the container 1 is rotated about its vertical axis with the glass fiber 3 adhering to the surface of said layer 2. Because of this rotation, the solidifying agent impregnating the glass fiber 3 and the layer of solidifying agent 2 adhering in the form of a thin film to the inner surface of the container 1 are combined into a single layer of solidifying agent.
  • the glass fiber is embedded in this layer and the solidifying agent sufficiently penetrates between the individual fibers.
  • the solidifying agent is dried so as to set under these conditions.
  • the solidifying agent flows gravitationally down the inner surface of the glass fiber layer 3 and, as a result, a rough surface 4 is created on the inner surface of this glass fiber layer 3.
  • a water-impervious layer 5 is then formed on this rough surface 4 of the glass fiber layer 3 as described below.
  • the alkali silicate solution acting as the Solidifying agent is spread over the bottom of the container 1 to form a thin layer 6 in a manner similar to the layer formed over the innder surface of the container described above, and a layer of glass fiber 7 . is laid on the surface of said layer 6 before it sets completely.
  • This glass fiber layer 7 is impregnated with the alkali silicate solution and the latter is dried and solidified in the same way as the inner surface of the container 1 described above.
  • the alkali silicate solution impregnating the glass fiber 7 may be that which has flowed down the inner surface of the container 1, or it may be separately supplied from the outside. Any superfluous alkali silicate solution impregnating the glass fiber layer 7 is removed from the container 1, and a rough surface 8 is created on the surface of said glass fiber layer 7 in the same manner as that on the inner surface of the container 1 described above.
  • Water-impervious layers 5; 9 are formed over said rough surfaces 4, 8 of the respective glass fiber layers 3, 7 in the following way.
  • the container 1 is sealed and evacuated to create a negative pressure therein, and then the water-impervious material is poured into this evacuated container 1, whereby the inter-fiber spaces in the glass fiber layers 3, 7 covering the inner surface of the container 1 are also placed under a negative pressure, allowing said water-impervious material to fill up even the most minute spaces between the individual fibers.
  • An inorganic ceramic material for example a glaze having the composition of 61% Si0 2 , 14% B 2 0 3 , 10% A1 2 0 3 , 8% N0 2 0 and 7% K 2 0, is preferred as the water-impervious material used in this invention.
  • This water-impervious material is applied over the rough surfaces 4, 8 r of said glass fiber layers 3, 7 so that it penetrates into said layers 3, 7.
  • the whole assembly is fired at a temperature of 900° to 1,300°C to thereby form a solidified container having water-impervious layers 5, 9.
  • the glass fiber adhere fast to the inner surface of the container 1 because of the alkali silicate solution, while the water-impervious layers 5, 9, 11 also adhere securely to the roughened surfaces of the glass fiber layers 3, 7, 10 through the medium of the alkali silicate solution, so that a solidified coating with a high resistance to water from the outside of the container is obtained. Therefore, even if the solidified coating is relatively reduced in thickness, a sufficient water resistance is still provided, and thus it is possible to increase the amount of waste that can be packed into the solidified coating, compared with the conventional practice in which the waste is covered with a solidified coating alone. This device can thus realize a highly efficient disposal of radioactive waste.
  • a particularly good workability is provided owing to the low fusing point of such a glaze, but it is also possible with this invention to use other materials having a good adhesion to both the container and the solidified layer, for example a polymerizable monomer such as unsaturated polyester, methyl methacrylate, styrene resin and other water-resistant resins (including water-resistant paints) as well as ceramics.
  • a polymerizable monomer such as unsaturated polyester, methyl methacrylate, styrene resin and other water-resistant resins (including water-resistant paints) as well as ceramics.
  • the waste is packed in the form of pellets, but in this invention, the waste need not necessarily be formed into pallets, it could be powdered, mixed with an alkali silicate and then solidified in a manner similar to the above. This procedure can also provide a solidified product with high water resistance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)
EP82111669A 1981-12-23 1982-12-16 Festes Produkt von radioaktiven Abfällen zur Beseitigung derselben Withdrawn EP0082483A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP207107/81 1981-12-23
JP20710781A JPS58109895A (ja) 1981-12-23 1981-12-23 放射性廃棄物の固化処理方法

Publications (1)

Publication Number Publication Date
EP0082483A1 true EP0082483A1 (de) 1983-06-29

Family

ID=16534310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111669A Withdrawn EP0082483A1 (de) 1981-12-23 1982-12-16 Festes Produkt von radioaktiven Abfällen zur Beseitigung derselben

Country Status (2)

Country Link
EP (1) EP0082483A1 (de)
JP (1) JPS58109895A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594513A (en) * 1982-11-08 1986-06-10 Chichibu Cement Co., Ltd. Multiplex design container having a three-layered wall structure and a process for producing the same
US4632779A (en) * 1983-05-30 1986-12-30 Hitachi, Ltd. Radioactive waste pellets in solidified form and a process for forming the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6238399A (ja) * 1985-08-13 1987-02-19 三菱マテリアル株式会社 廃棄物の封止方法
FR3002075B1 (fr) * 2013-02-14 2015-03-06 Areva Nc Panier en fibre de verre et procede d'incineration de dechets

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1173998B (de) * 1961-10-10 1964-07-16 Dr Guenter Friese Verfahren zur Beseitigung radioaktiver Abfallstoffe
DE2549304A1 (de) * 1975-05-12 1976-11-25 Aerojet General Co Packung zur lagerung festen toxischen materials und packungsverfahren
FR2356246A1 (fr) * 1976-06-24 1978-01-20 Kernforschung Gmbh Ges Fuer Procede pour l'amelioration de la resistance a la lixiviation des produits de la solidification des matieres radioactives par le bitume
FR2473213A1 (fr) * 1980-01-07 1981-07-10 Ecopo Dispositif de confinement a long terme de dechets radioactifs ou toxiques et son procede de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1173998B (de) * 1961-10-10 1964-07-16 Dr Guenter Friese Verfahren zur Beseitigung radioaktiver Abfallstoffe
DE2549304A1 (de) * 1975-05-12 1976-11-25 Aerojet General Co Packung zur lagerung festen toxischen materials und packungsverfahren
FR2356246A1 (fr) * 1976-06-24 1978-01-20 Kernforschung Gmbh Ges Fuer Procede pour l'amelioration de la resistance a la lixiviation des produits de la solidification des matieres radioactives par le bitume
FR2473213A1 (fr) * 1980-01-07 1981-07-10 Ecopo Dispositif de confinement a long terme de dechets radioactifs ou toxiques et son procede de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594513A (en) * 1982-11-08 1986-06-10 Chichibu Cement Co., Ltd. Multiplex design container having a three-layered wall structure and a process for producing the same
US4632779A (en) * 1983-05-30 1986-12-30 Hitachi, Ltd. Radioactive waste pellets in solidified form and a process for forming the same

Also Published As

Publication number Publication date
JPS6137600B2 (de) 1986-08-25
JPS58109895A (ja) 1983-06-30

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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17P Request for examination filed

Effective date: 19830704

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850709

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HIRANO, MIKIO

Inventor name: HORIUCHI, SUSUMU

Inventor name: TAMATA, SHIN