Published October 1981
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A survey on fuel pellet cracking and healing phenomena in reactor operation
Description
In normal reactor operation, oxide fuel pellets will crack. The majority of the pellet segments will lie against the cladding. When temperature in the central region of the fuel during irradiation is raised to the plastic region, crack healing occurs. The repetition of cracking-healing-cracking sequence resulting from repeated power cycle has a significant effect on fuel relocation. The fuel pellet relocation must be known since it effects the cladding life time. The fuel pellet cracking and healing phenomeno in reactor operation are described and the pertinant method of analysis is also discussed. (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Na operacao normal de um reator nuclear sabe-se que as pastilhas de combustivel trincam radialmente. Quando a temperatura do combustivel atinge niveis que levam as zonas centrais da pastilha a regiao plastica as rachaduras sao parcialmente fechadas. A repeticao dos fenomenos de abertura e fechamento das rachaduras resultam dos repetidos ciclos de potencia a que o combustivel e submetido. Isto tem um efeito consideravel na reacomodacao do combustivel. O processo de reacomodacao deve ser corretamente analisado pois tem efeito direto na vida util do encamisamento. Os fenomenos de abertura e fechamento de rachaduras na operacao de um reator, e os metodos de analise pertinentes, sao discutidos. (Autor)Files
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Additional details
Publishing Information
- Imprint Pagination
- 19 p.
- Report number
- IPEN-Inf--09
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 13703398
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Descriptors DEI
- CRACKING; FUEL PELLETS; HEALING; REACTOR OPERATION
- Descriptors DEC
- BIOLOGICAL RECOVERY; CHEMICAL REACTIONS; DECOMPOSITION; OPERATION; PYROLYSIS