Oxygen distribution in fast reactor oxide fuels
- 1. UKAEA, Harwell. Chemical Technology Div.
- 2. Milan Univ. (Italy). Istituto di Elettrochimica e Metallurgia
- 3. Commission of the European Communities, Karlsruhe (Germany, F.R.). European Inst. for Transuranium Elements
Description
The chemistry of irradiated fuel pins has been examined with respect to oxygen distribution. Two hypostoichiometric mixed oxide fuel pins have been irradiated to high burn up under controlled conditions in a materials testing reactor. The radial oxygen profile at the end of irradiation has been measured. Small specimens were extracted from differing points on the radius of the fuel; their oxygen potential was measured in a micro galvanic cell. The results have shown that, although the pins had initially widely different oxygen contents (O/M values of 1.948 and 1.976), the final O/M values were virtually identical at 1.992 and 1.997. This is contrary to the behaviour predicted from existing fuel chemistry theory. Oxidation above 1.997 O/M in the higher initial O/M pin is prevented by the oxidation of the clad. (orig./HP)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Die Chemie von bestrahlten Brennstaeben wurde bezueglich der Sauerstoffverteilung untersucht. Zwei hypostoechiometrische Mischoxidbrennstaebe wurden unter kontrollierten Bedingungen in einem Materialtestreaktor bis zu hohen Abbraender bestrahlt. Es wurde das radiale Sauerstoffprofil am Ende der Bestrahlung gemessen. Von verschiedenen Stellen auf den Brennstoffradius wurden kleine Proben entnommen; ihr Sauerstoffpotential wurde in einer galvanischen Mikrozelle gemessen. Die Ergebnisse haben gezeigt, dass, obwohl die Staebe zu Beginn sehr verschiedene Sauerstoffgehalte aufwiesen (O/M-Werte von 1.948 und 1.976) die O/M-Werte am Ende mit 1.992 und 1.997 praktisch gleich waren. Dies steht im Gegensatz zu dem aus der vorhandenen Theorie der Brennstoffchemie vorhergesagten Verhalten. In dem Brennstab mit hoeheren Anfangs-O/M wird die Oxydation ueber 1.997 O/M durch Oxydation der Huelle verhindert. (orig./HP)
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Additional details
Publishing Information
- Imprint Pagination
- 5 p.
- Report number
- INKA-Conf--79-003-006
Conference
- Title
- International symposium on thermodynamics of nuclear materials.
- Dates
- 29 Jan - 2 Feb 1979.
- Place
- Juelich, Germany, F.R.
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 10460459
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- BINARY MIXTURES; BURNUP; DISTRIBUTION; FUEL PINS; LMFBR TYPE REACTORS; OXYGEN; PLUTONIUM DIOXIDE; URANIUM DIOXIDE
- Descriptors DEC
- ACTINIDE COMPOUNDS; BREEDER REACTORS; CHALCOGENIDES; DISPERSIONS; ELEMENTS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; FUEL ELEMENTS; LIQUID METAL COOLED REACTORS; MIXTURES; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PLUTONIUM COMPOUNDS; PLUTONIUM OXIDES; REACTOR COMPONENTS; REACTORS; TRANSURANIUM COMPOUNDS; URANIUM COMPOUNDS; URANIUM OXIDES
Optional Information
- Secondary number(s)
- IAEA-SM--236/7(preprint).