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EP0060765A1 - Neutronenabsorbierendes Material, Verfahren zu seiner Herstellung und Verwendung dieses Materials für Lagerbehälter - Google Patents

Neutronenabsorbierendes Material, Verfahren zu seiner Herstellung und Verwendung dieses Materials für Lagerbehälter Download PDF

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Publication number
EP0060765A1
EP0060765A1 EP82400401A EP82400401A EP0060765A1 EP 0060765 A1 EP0060765 A1 EP 0060765A1 EP 82400401 A EP82400401 A EP 82400401A EP 82400401 A EP82400401 A EP 82400401A EP 0060765 A1 EP0060765 A1 EP 0060765A1
Authority
EP
European Patent Office
Prior art keywords
boron carbide
product
product according
neutron absorbing
polyethylene
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Withdrawn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
EP82400401A
Other languages
English (en)
French (fr)
Inventor
Pierre Cals
Roger Conche
Gérard Fraize
Lucien Hayet
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 EP0060765A1 publication Critical patent/EP0060765A1/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Withdrawn legal-status Critical Current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
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/04—Concretes; Other hydraulic hardening materials
    • G21F1/042—Concretes combined with other materials dispersed in the carrier
    • G21F1/045—Concretes combined with other materials dispersed in the carrier with organic substances

Definitions

  • the subject of the present invention is a product capable of absorbing neutrons as well as a process for manufacturing this product.
  • the materials produced so far include substances rich in hydrogen to slow down fast neutrons (this is the case with polyethylene) and substances capable of absorbing slowed down neutrons like boron compounds.
  • French patent 1,534,032 belonging to the applicant, describes a material capable of absorbing neutrons consisting of polyethylene, plaster, water and boric acid. If such a product has good absorbent qualities, its manufacture causes a certain number of difficulties. This was how we noted a poor amalgamation of the components and a rise in the surface of the polyethylene beads during the solidification phase of the product; moreover this last stage always required a fairly long time.
  • the object of the present invention is precisely a neutron absorbing material which overcomes these drawbacks by using thixotropic concrete.
  • the product which is the subject of the invention, it comprises a thixotropic concrete in which are incorporated 30 to 40% by weight of high density polyethylene beads and 1 to 5 ⁇ by weight of boron carbide grains.
  • the polyethylene balls have a diameter of the order of 2 to 5 mm and the grains of boron carbide have dimensions of the order of 300 to 500 ⁇ m.
  • the invention also relates to an application of this product to the production of storage castles of the type comprising an internal wall and an external wall between which there is a neutron absorbing product.
  • the internal face of the external wall is covered with a paint based on boron carbide and the product according to the invention is poured between the internal and external walls of the castle.
  • the product is poured into the container for which it is intended, for example between the walls of a storage castle, while agitating the latter using a vibrating system which can be in the form pneumatic vibrating needles. Thanks to this last precaution, the product remains liquid until the end of the operation, which ensures good homogeneity, homogeneity all the better as the product solidifies quickly once the vibrations have stopped, which avoids disadvantages of the prior art.
  • Test tubes are hermetically sealed to keep the moisture content of the compound constant.
  • curve 2 is clearly below curve 1 while curve 3 is very close to curve 2: a very low content of boron carbide is therefore sufficient to appreciably reduce the dose rate. neutron.
  • the material which is the subject of the invention has numerous advantages, in particular with regard to its preparation process.
  • the use of thixotropic concrete makes it possible to keep the liquid product while the mixing is carried out in the concrete mixer and while it is poured into the storage castle since it is set in motion by vibrating needles .
  • a very homogeneous product is obtained. since solidification takes place quickly once the vibrations have ceased.
  • this product has good mechanical strength, good fire resistance and a low cost price since it can be produced from materials readily available on the market.
  • the procedure is as follows: first cover the internal face of the external wall with a base paint boron carbide, the product according to the invention is then poured between the walls of the castle while keeping it in vibration and the vibrations are stopped to allow the product to harden.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP82400401A 1981-03-13 1982-03-08 Neutronenabsorbierendes Material, Verfahren zu seiner Herstellung und Verwendung dieses Materials für Lagerbehälter Withdrawn EP0060765A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8105057A FR2501895A1 (fr) 1981-03-13 1981-03-13 Produit absorbant les neutrons, son procede de fabrication et application de ce produit a la realisation de chateaux de stockage
FR8105057 1981-03-13

Publications (1)

Publication Number Publication Date
EP0060765A1 true EP0060765A1 (de) 1982-09-22

Family

ID=9256212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400401A Withdrawn EP0060765A1 (de) 1981-03-13 1982-03-08 Neutronenabsorbierendes Material, Verfahren zu seiner Herstellung und Verwendung dieses Materials für Lagerbehälter

Country Status (3)

Country Link
EP (1) EP0060765A1 (de)
JP (1) JPS57170857A (de)
FR (1) FR2501895A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225788A1 (de) * 1982-05-07 1984-01-12 Selim Dipl.-Ing. 8000 München Mourad Baustoff und verfahren zu dessen herstellung
WO1999066512A3 (fr) * 1998-06-15 2000-01-27 Vladimir Aleksandrovi Kurnosov Structure de protection contre des substances radioactives, et procede et materiau permettant de fabriquer cette structure
WO2002037906A3 (en) * 2000-11-01 2002-09-06 Axcelis Tech Inc Mechanism for containment of neutron radiation in ion implanter beamline
CN117886554A (zh) * 2023-12-29 2024-04-16 华东材料苏州有限公司 一种多密度等级泵送防辐射混凝土及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3362745B2 (ja) * 1993-07-28 2003-01-07 ブラザー工業株式会社 感光性マイクロカプセル型トナー

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB808563A (en) * 1972-12-29 1959-02-04 Ass Elect Ind Improvements in and relating to nuclear reactors
GB1046878A (en) * 1964-06-15 1966-10-26 Electricite De France Material for protection against ionising radiations
FR1458833A (fr) * 1964-11-27 1966-11-10 English Electric Co Ltd Matière arrêtant les rayonnements
FR1534032A (fr) * 1967-06-14 1968-07-26 Commissariat Energie Atomique Matériau absorbant les neutrons et son procédé de fabrication
US4123392A (en) * 1972-04-13 1978-10-31 Chemtree Corporation Non-combustible nuclear radiation shields with high hydrogen content

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1046878A (en) * 1964-06-15 1966-10-26 Electricite De France Material for protection against ionising radiations
FR1458833A (fr) * 1964-11-27 1966-11-10 English Electric Co Ltd Matière arrêtant les rayonnements
FR1534032A (fr) * 1967-06-14 1968-07-26 Commissariat Energie Atomique Matériau absorbant les neutrons et son procédé de fabrication
US4123392A (en) * 1972-04-13 1978-10-31 Chemtree Corporation Non-combustible nuclear radiation shields with high hydrogen content
GB808563A (en) * 1972-12-29 1959-02-04 Ass Elect Ind Improvements in and relating to nuclear reactors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NUCLEONICS, volume 19, no. 11, 1961, NEW YORK (US) H. HODGE et al.: "Neutron-shield materials" pages 158-166 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3225788A1 (de) * 1982-05-07 1984-01-12 Selim Dipl.-Ing. 8000 München Mourad Baustoff und verfahren zu dessen herstellung
WO1999066512A3 (fr) * 1998-06-15 2000-01-27 Vladimir Aleksandrovi Kurnosov Structure de protection contre des substances radioactives, et procede et materiau permettant de fabriquer cette structure
WO2002037906A3 (en) * 2000-11-01 2002-09-06 Axcelis Tech Inc Mechanism for containment of neutron radiation in ion implanter beamline
CN117886554A (zh) * 2023-12-29 2024-04-16 华东材料苏州有限公司 一种多密度等级泵送防辐射混凝土及其制备方法

Also Published As

Publication number Publication date
FR2501895A1 (fr) 1982-09-17
JPS57170857A (en) 1982-10-21

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Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE GB

17P Request for examination filed

Effective date: 19830302

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840907

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CALS, PIERRE

Inventor name: CONCHE, ROGER

Inventor name: HAYET, LUCIEN

Inventor name: FRAIZE, GERARD