US3754059A - Method for the manufacture of a quasi-homogeneous formation - Google Patents

Method for the manufacture of a quasi-homogeneous formation Download PDF

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Publication number
US3754059A
US3754059A US00045628A US3754059DA US3754059A US 3754059 A US3754059 A US 3754059A US 00045628 A US00045628 A US 00045628A US 3754059D A US3754059D A US 3754059DA US 3754059 A US3754059 A US 3754059A
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US
United States
Prior art keywords
particles
container
fractions
quasi
fraction
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Expired - Lifetime
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US00045628A
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English (en)
Inventor
G Prantl
I Horvath
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AN DER EIDG TECHN HOCHSCHULE G
GES AN DER EIDG TECHN HOCHSCHULE CH
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AN DER EIDG TECHN HOCHSCHULE G
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
    • G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
    • G21C21/04—Manufacture of fuel elements or breeder elements contained in non-active casings by vibrational compaction or tamping of fuel in the jacket
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • ABSTRACT 0F THE DISCLOSURE A method of manufacturing a quasi-homogeneous formation from a plurrality of separate particles of different size.
  • the particles are separated into fractions according to size, which fractions together are required for filling a certain container volume.
  • the amount of each fraction is determined so that when the particles are within the container, the smaller particles will till out the hollow space between the larger particles.
  • the determined amounts of all fractions are divided into several partial amounts.
  • the container is then filled with the partial amounts in regularly distributed arrangement. Thereafter the uppermost particle layer, to avoid decomposition, is loaded by a pressure force, and the container is exposed to a vibration to reduce the spaces between the particles, thereby creating a quasi-homogeneous formation.
  • ceramic particles for example uranium oxides orl plutonium oxides or carbides are used. These elements must illustrate a quasi-homogeneous and compact formation whereby the term quasi-homogeneous is supposed to characterize the quality of the formation which is the same all over except for the particle-shaped structure, for which reason it is necessary to put together particles of different size in such a manner that possibly no hollow spaces remain between them. For this purpose the particles are exposed to a vibration. In using this technique different methods are known.
  • particles of a certain size are compressed in a container by means of vibration and the thus compressed particles then are prevented from a further movement by pressing a sieve against the free surface of the particles, the mesh width of said sieve being smaller than the particles themselves in order to be able to introduce through a renewed use of vibration particles of a smaller size through said sieve which particles are supposed to fill the hollow spaces between the larger particles.
  • the mesh width of said sieve being smaller than the particles themselves in order to be able to introduce through a renewed use of vibration particles of a smaller size through said sieve which particles are supposed to fill the hollow spaces between the larger particles.
  • the particles of the different fractions separated according to sizes are filled simultaneously into the container in exact quantity selection and are mixed when they meet in the container for which, however, extremely expensive dosing devices are needed which make the method disadvantageously expensive.
  • the invention pursues the goal of a considerable method specification particularly in order to thereby have the possibility to use both ball-shaped particles and particles with breaking edges for the manufacture of a quasihomogeneous formation.
  • the method of the above-mentioned type is therefore characterized according to the invention in such a manner that the fractions of particles are separated according to sizes and which together are required for the formation of a certain container volume, the amount of each fraction is determined according to the measure that within the container volume the next smaller particles lill out the hollow spaces between the larger particles, and that the thus determined amounts of all fractions are each divided into equally many partial amounts and are brought through an interchangeable filling of the partial amounts into the container into an arrangement regularly ydistributed over the container volume, whereafter the uppermost particle layer, to avoid a decomposition, is loaded by a pressure force and the container is exposed to a Vibration in such a manner that, by reducing the spaces between the particles, a quasi-homogeneous formation is created.
  • the partial amounts of different fractions can be advantageously filled successively into the container whereby the sequence is repeated according to the number of divisions of each fraction. lf for example each fraction is divided into four partial amounts, then in the case of three present fractions of different size the sequence of these fractions will be repeated four times.
  • the individual partial amounts of the fractions can thereby preferably succeed one another in the sequence of decreasing size. It is also possible to lill mixed partial amounts of different fractions, interchangeably with a partial amount of a further fraction into the container whereby this is also repeated corresponding to the number of divisions of each of the fractions.
  • the optimum layer height of a partial amount in the container is advantageously determined according to the provided particle quality in view of the shortest vibration time and the number of divisions of the fraction required for a requested total length of the formation can be found with the layer height determined in such a manner.
  • FIG. l is a longitudinal cross-sectional view of a container filled with particles, into which container according to the method three fractions of different sizes each with a division into four partial amounts are filled interchangeably.
  • 'F.IG. 2 illustrates a container filled with particles, into which container two mixed partial amounts of different fractions are filled interchangeably with a partial amount of a further fraction.
  • a container 1 is arranged on a vibrator 2. Particles of three fractions of different sizes are filled into the container 1, whereby each fraction is divided into four equal partial amounts, namely a coarse .fraction 3, a medium fraction 4 and a line fraction 5. Each ne fraction 5 is followed by a coarse fraction 3, etc.
  • the surface of the uppermost particle layer is loaded by the ram 6 of a press in order to avoid a decomposition during the vibration process, whereby this ram is constantly under pressure even when the fill level decreases due to the compression of the particles caused by the vibration.
  • the particles of the single fractions must travel only small distances in order to arrive in the hollow spaces of the next coarser fraction and to fill out same. In this manner it is possible to produce a quasi-homogeneous formation not only with a ball-shaped particles but also with particles which have adges.
  • the container 1 is also arranged on a vibrator 2 and the uppermost layer of particles is loaded by the ram 6 of a press during vibration. Ditfering from the filling manner of the particles according to FIG. 1, here, the partial amounts of fractions 3 and 4 are mixed together before lling and on top of these mixed partial amounts there is lled a partial amount of the fraction 5, whereby again rall fractions are divided into four partial amounts.
  • a process for the formation of a quasi-homogeneous mass of separate particles o.f different particle size within a container and usable with rounded and broken edged particles comprising the steps of:
  • step (4) repeating step (4) above for the remaining partial amounts to cause further layer-like sequences of decreasing particle size to be deposited on top of said first-mentioned layer-like sequence; then pressurizing by use of a ram under continued pressure the uppermost particle layer; and

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Powder Metallurgy (AREA)
  • Basic Packing Technique (AREA)
  • Crushing And Grinding (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Developing Agents For Electrophotography (AREA)
US00045628A 1969-06-20 1970-06-12 Method for the manufacture of a quasi-homogeneous formation Expired - Lifetime US3754059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH944869A CH486104A (de) 1969-06-20 1969-06-20 Verfahren zur Herstellung eines quasi-homogenen Gebildes

Publications (1)

Publication Number Publication Date
US3754059A true US3754059A (en) 1973-08-21

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Family Applications (1)

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US00045628A Expired - Lifetime US3754059A (en) 1969-06-20 1970-06-12 Method for the manufacture of a quasi-homogeneous formation

Country Status (4)

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US (1) US3754059A (de)
BE (1) BE752111A (de)
CH (1) CH486104A (de)
DE (1) DE2021846C3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125577A (en) * 1976-03-24 1978-11-14 Kraftwerk Union Aktiengesellschaft Method of automatically filling nuclear fuel rod jacket tubes
US4710480A (en) * 1984-12-05 1987-12-01 Didier-Werke Ag Method of ceramic molding which produces a porosity gradient and the manufacture of compound moldings using this method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292127A (en) * 1978-04-14 1981-09-29 United Kingdom Atomic Energy Authority Nuclear fuel pins

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125577A (en) * 1976-03-24 1978-11-14 Kraftwerk Union Aktiengesellschaft Method of automatically filling nuclear fuel rod jacket tubes
US4710480A (en) * 1984-12-05 1987-12-01 Didier-Werke Ag Method of ceramic molding which produces a porosity gradient and the manufacture of compound moldings using this method

Also Published As

Publication number Publication date
CH486104A (de) 1970-02-15
DE2021846B2 (de) 1974-10-24
DE2021846A1 (de) 1971-01-14
BE752111A (fr) 1970-12-01
DE2021846C3 (de) 1975-06-05

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