GB1002078A - Process for coating nuclear fuel particles with pyrolytic graphite - Google Patents

Process for coating nuclear fuel particles with pyrolytic graphite

Info

Publication number
GB1002078A
GB1002078A GB46402/63A GB4640263A GB1002078A GB 1002078 A GB1002078 A GB 1002078A GB 46402/63 A GB46402/63 A GB 46402/63A GB 4640263 A GB4640263 A GB 4640263A GB 1002078 A GB1002078 A GB 1002078A
Authority
GB
United Kingdom
Prior art keywords
particles
pyrolytic graphite
coating step
nuclear fuel
temperature
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.)
Expired
Application number
GB46402/63A
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.)
Union Carbide Corp
Original Assignee
Union Carbide Corp
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
Priority claimed from US245512A external-priority patent/US3247008A/en
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Publication of GB1002078A publication Critical patent/GB1002078A/en
Expired legal-status Critical Current

Links

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
    • G21C3/626—Coated fuel particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • 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

Abstract

Nuclear fuel particles, e.g. uranium or thorium carbides, are coated with pyrolytic graphite by heating to a temperature slightly below their surface sintering temperature in a mixture of inert gas diluent and hydrocarbon gas of volume ratio from 3:1 to 20:1, for a period of time sufficient to deposit a layer or laminar pyrolytic graphite or a thickness of from 5-50 microns on the particles, and further heating the thus coated particles to a temperature of at least 1800 DEG C. in a gaseous mixture as above but of volume ratio from 7:1 to 20:1 for a period of time sufficient to deposit a layer of columnar pyrolytic graphite of the desired thickness on the particles. Suitable hydrocarbons are benzene, methane, ethane, propane, butane, ethylene, propene, butene, pentene, acetylene, cyclobutane, cyclopentane, cyclohexane, cyclobutene and cyclopentene, while suitable inert gas diluents are argon, helium and hydrogen. After the first coating step, the particles may be washed in an acid bath at from 90-98 DEG C. to eliminate any surface contamination and to dissolve any particles which may be uncoated and therefore would tend to sinter at high temperatures. In one example, UC2 particles having a surface sintering temperature of 1775 DEG C. are heated at between 1700 DEG C. and 1750 DEG C. in the first coating step and at 1800 DEG C. in the second coating step.
GB46402/63A 1962-12-18 1963-11-25 Process for coating nuclear fuel particles with pyrolytic graphite Expired GB1002078A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US245512A US3247008A (en) 1962-12-18 1962-12-18 Process for coating radioactive spheroids with pyrolytic graphite
US516862A US3306825A (en) 1962-12-18 1965-12-28 Radioactive spheroids coated with pyrolytic graphite

Publications (1)

Publication Number Publication Date
GB1002078A true GB1002078A (en) 1965-08-25

Family

ID=26937288

Family Applications (1)

Application Number Title Priority Date Filing Date
GB46402/63A Expired GB1002078A (en) 1962-12-18 1963-11-25 Process for coating nuclear fuel particles with pyrolytic graphite

Country Status (2)

Country Link
US (1) US3306825A (en)
GB (1) GB1002078A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335063A (en) * 1963-11-18 1967-08-08 Gen Dynamics Corp Multi-pyrocarbon coated nuclear fuel and poison particles and method of preparing same
US3361638A (en) * 1967-04-07 1968-01-02 Atomic Energy Commission Usa Pyrolytic graphite and nuclear fuel particles coated therewith
US3488409A (en) * 1967-11-08 1970-01-06 Atomic Energy Commission Process for consolidating nuclear fuel particles
EP0658219B1 (en) * 1993-06-01 1999-03-24 Advanced Ceramics Corporation Fluidized bed reactor arrangement for forming a metal carbide coating on a substrate containing graphite or carbon

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151037A (en) * 1961-02-21 1964-09-29 Minnesota Mining & Mfg Encased fuel
US3129188A (en) * 1961-03-16 1964-04-14 Minnesota Mining & Mfg Crystalline spherules
US3179723A (en) * 1962-06-12 1965-04-20 Walter V Goeddel Method of forming metal carbide spheroids with carbon coat
US3231308A (en) * 1963-12-04 1966-01-25 Emil J Paider Company Adjustable headrest for barber chairs

Also Published As

Publication number Publication date
US3306825A (en) 1967-02-28

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