DE2019304A1 - Radiation-resistant nuclear fuel composite bodies with graphite matrix for nuclear fuel elements for high-temperature reactors - Google Patents
Radiation-resistant nuclear fuel composite bodies with graphite matrix for nuclear fuel elements for high-temperature reactorsInfo
- Publication number
- DE2019304A1 DE2019304A1 DE19702019304 DE2019304A DE2019304A1 DE 2019304 A1 DE2019304 A1 DE 2019304A1 DE 19702019304 DE19702019304 DE 19702019304 DE 2019304 A DE2019304 A DE 2019304A DE 2019304 A1 DE2019304 A1 DE 2019304A1
- Authority
- DE
- Germany
- Prior art keywords
- nuclear fuel
- graphite
- radiation
- composite bodies
- powder
- 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
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 33
- 229910002804 graphite Inorganic materials 0.000 title claims description 15
- 239000010439 graphite Substances 0.000 title claims description 15
- 239000011159 matrix material Substances 0.000 title claims description 9
- 239000002131 composite material Substances 0.000 title claims description 6
- 239000003758 nuclear fuel Substances 0.000 title claims description 5
- 230000005855 radiation Effects 0.000 title claims description 4
- 239000000446 fuel Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000004071 soot Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000009395 breeding Methods 0.000 claims 1
- 230000001488 breeding effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 239000011230 binding agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- -1 soot Chemical compound 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/62—Ceramic fuel
- G21C3/64—Ceramic dispersion fuel, e.g. cermet
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Carbon And Carbon Compounds (AREA)
Description
NUKEMNUKEM
Nuklear-Chemie und -Metallurgie Gesellschaft m.b.H.Nuclear Chemistry and Metallurgy Society m.b.H.
WoIfgang b. HanauWoIfgang b. Hanau
Strahlenbeständige Kernbrennstoff-Verbundkörper mit Graphitmatrix für Kernbrennstoffelemente für Hochtemperaturreaktoren. Radiation resistant nuclear fuel composites with Graphite matrix for nuclear fuel elements for high temperature reactors.
Brennstoffkörper für Hochtemperatur-Reaktoren werden allgemein hergestellt durch Einbetten von beschichteten Brennstoffpartikeln in eine Graphitmatrix. Dabei werden die Brennstoffpartikeln (UO2-, UC2- (Th,U)O2- oder (Th,U)C2-Kerne von 15ο-8σσ μ Durchmesser, beschichtet mit Pyrolytkohlenstoff und SiC), nach verschiedenen Methoden eingebracht:Fuel bodies for high temperature reactors are generally made by embedding coated fuel particles in a graphite matrix. The fuel particles (UO 2 -, UC 2 - (Th, U) O 2 - or (Th, U) C 2 cores of 15ο-8σσ μ diameter, coated with pyrolytic carbon and SiC) are introduced using various methods:
a) Die Brennstoffpartikeln werden mit einem geeigneten Graphit pulver gemischt, das stets eine Binderkomponertte enthält, und dieses Gemisch wird zu zylindrischen oder stabfb'rmigen Brennstoffkörpern gepresst.a) The fuel particles are mixed with a suitable graphite powder, which always contains a binder component, and this mixture becomes cylindrical or rod-shaped Pressed fuel bodies.
b) Die Brennstoffpartikeln werden zunächst mit;, dem Graphitpulver umhüllt; das gebildete Granulat wird zu Brennstoffkörpern verpresst.b) The fuel particles are first mixed with ;, the graphite powder envelops; the granules formed are pressed into fuel bodies.
c.) Die Brennstoff partikeln werden zunächst mit dem Graphitpulver, das hierbei einen hohen Anteil von Binder enthält, umhüllt und in einen im allgemeinen ringförmigen Spalt eines Graphitkörpers einvibriert und in diesem Spalt durch Erhitzen verfestigt.c.) The fuel particles are first mixed with the graphite powder, which here contains a high proportion of binder, enveloped and in a generally annular gap vibrated in a graphite body and through this gap Heating solidifies.
d) Die Brennstoffpartikeln werden in eine Stahlform einvibriert, mit einem Schlicker aus Graphitpulver und Binder, gegebenenfalls bei erhöhter Temperatur, übergössen und dadurch in eine Matrix eingebettet.d) The fuel particles are vibrated into a steel mold, with a slip of graphite powder and binder, if necessary at elevated temperature, poured over and thereby embedded in a matrix.
-Z--Z-
109845/0808109845/0808
Das für diese Matrixherstellung verwendete Graphitpulver hat allgemein eine maximale KorngrÖsse von 60-I00 μ und ist nicht nur hinsichtlich seiner Kornform, sondern auch hinsichtlich der Anordnung der Graphitgitterebenen im Korn selbst stark orientiert. Bei der Herstellung des Formkörpers durch Pressen wird eine mehr oder weniger starke Orientierung des Graphits in der Verbundkörpermatrix erreicht.The graphite powder used for this matrix production generally has a maximum grain size of 60-100 μ and is not only with regard to its grain shape, but also with regard to the arrangement of the graphite lattice planes in the grain itself strongly oriented. During the production of the molded body by pressing, a more or less strong orientation of the Graphite achieved in the composite body matrix.
Mit derartigen Graphit-Pulvern hergestellte Brennstoffkörper zeigen eine unbefriedigende Bestrahlungsbeständigkeit und unterschiedliche, kornrichtungsabhängige Dimensionsänderungen.Fuel bodies produced with such graphite powders show an unsatisfactory resistance to radiation and different dimensional changes depending on the grain direction.
Diese Nachteile im Bestrahlungsverhalten, die nur zum Teil durch das Herstellverfahren bedingt sind, können erfindungsgemäss dadurch überwunden werden, dass anstelle des bisher verwendeten Graphitpulvers, das sowohl hinsichtlich der Kornform als auch der Anordnung der Graphitgitterebenen im Korn selbst eine eindeutige Vorzugsorientierung aufweist, strukturloses Graphit- und/oder Kohlenstoffpulver verwendet wird.These disadvantages in the irradiation behavior, which are only partly due to the manufacturing process, can be eliminated according to the invention be overcome in that instead of the previously used graphite powder, both in terms of The grain shape and the arrangement of the graphite lattice planes in the grain itself have a clear preferred orientation, structureless graphite and / or carbon powder is used.
Im Falle des Graphitpulvers ist es erforderlich, ein Ultrafeinkorn-Graphit pulver mit Korngrösse ^ 2o μ zu verwenden, das quasi strukturlos, d.h. ohne Vorzugsorientierung ist« Dieses strukturlose Graphitpulver kann weitgehend, vorzugsweise bis zu einem Anteil von 5o $, durch Kohlenstoff pulver, z.B. Russ, vorzugsweise Thermax-Russ, ersetzt werden. Russ hat bekanntlich eine Korngrösse von <1 μ.In the case of the graphite powder, it is necessary to use an ultrafine-grain graphite use powder with grain size ^ 2o μ, the quasi structureless, i.e. without preferential orientation «This structureless graphite powder can largely, preferably up to a portion of $ 50, through carbon powder, e.g. soot, preferably Thermax soot, can be replaced. Soot is known to have a grain size of <1 μ.
Mit diesen, im Hinblick auf die Anwendung praktisch strukturlosen Kohlenstoff- oder Graphitpulvern lassen sich nach den oben unter a) - d) genannten Verfahren Brennstoff-Verbundkörper mit einer Matrix ohne Vorzugsorientierung der Eigenschaften herstellen.With these carbon or graphite powders, which are practically structureless in terms of the application, the Process mentioned above under a) - d) fuel composite body with a matrix without preferential orientation of the properties produce.
1Q9S45/08081Q9S45 / 0808
Mit dieser quasi strukturlosen Matrix können nicht nur die bei anisotropen Graphiten auftretenden sehr starken anisotropen Dimensionsänderungen verhindert werden, sondern auch die bei sogenannten isotropen, aber mikroskopisch noch anisotropen Graphitkörpern auftretenden anisotropen Dimensionsänderungen und Schäden vermieden werden, weil das nach dem erfindungsgemässen Verfahren verwendete Graphit- bzw. Kohlenstoffpulver auch im Korn selbst praktisch keine Vorzugsorientierung aufweist. With this quasi structureless matrix, not only the very strong anisotropic dimensional changes occurring in anisotropic graphites can be prevented, but also with so-called isotropic, but microscopically still anisotropic graphite bodies, anisotropic dimensional changes occurring and damage can be avoided because that according to the invention Graphite or carbon powder used in the process also has practically no preferred orientation in the grain itself.
109845/0808109845/0808
Claims (1)
20.4.1970Schn / Spi
April 20, 1970
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702019304 DE2019304C3 (en) | 1970-04-22 | Process for the production of radiation-resistant nuclear fuel composite bodies for high-temperature reactors | |
| FR7110008A FR2086239B1 (en) | 1970-04-22 | 1971-03-22 | |
| GB1034671*[A GB1338146A (en) | 1970-04-22 | 1971-04-21 | Nuclear fuel compacts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702019304 DE2019304C3 (en) | 1970-04-22 | Process for the production of radiation-resistant nuclear fuel composite bodies for high-temperature reactors |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2019304A1 true DE2019304A1 (en) | 1971-11-04 |
| DE2019304B2 DE2019304B2 (en) | 1974-11-14 |
| DE2019304C3 DE2019304C3 (en) | 1976-02-12 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| FR2086239A1 (en) | 1971-12-31 |
| DE2019304B2 (en) | 1974-11-14 |
| FR2086239B1 (en) | 1975-04-18 |
| GB1338146A (en) | 1973-11-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| EHJ | Ceased/non-payment of the annual fee |