Effects of UO2 fuel microstructure and density on fuel inreactor performance

Lena Hansson

Research output: Book/ReportReport

Abstract

The volume changes of UO2 fuel pellets, produced by neutron irradiation, can be characterized by two processes: fission spike induced densification through pore shrinkage and later fission product induced swelling of UO2 matrix. In-pile densification is controlled by the initial density and microstructure of the fuel, particularly by the pore size distribution. The extent of swelling depends mainly on the amount of fission products produced, but the fission gas release as well as the swelling may be reduced by increasing the grain size of UO2. Fabrication of fuel pellets having certain in-reactor properties requires detailed knowledge of the effects of individual fabrication parameters. The irradiation experience of fuels fabricated by using different conversion and pelletizing methods is extensive. Based on this experience, some general characteristics of stable/well-performing fuel microstructures have been summarized.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages58
ISBN (Print)951-38-3030-6
Publication statusPublished - 1988
MoE publication typeNot Eligible

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tiedotteita
Number830
ISSN0358-5085

Fingerprint

Swelling
Fission products
Densification
Microstructure
Pelletizing
Fabrication
Neutron irradiation
Pore size
Piles
Irradiation
Gases

Keywords

  • nuclear fuel pellets
  • uranium oxides
  • densification
  • swelling
  • gases

Cite this

Hansson, L. (1988). Effects of UO2 fuel microstructure and density on fuel inreactor performance. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tiedotteita, No. 830
Hansson, Lena. / Effects of UO2 fuel microstructure and density on fuel inreactor performance. Espoo : VTT Technical Research Centre of Finland, 1988. 58 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 830).
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Hansson, L 1988, Effects of UO2 fuel microstructure and density on fuel inreactor performance. Valtion teknillinen tutkimuskeskus. Tiedotteita, no. 830, VTT Technical Research Centre of Finland, Espoo.

Effects of UO2 fuel microstructure and density on fuel inreactor performance. / Hansson, Lena.

Espoo : VTT Technical Research Centre of Finland, 1988. 58 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 830).

Research output: Book/ReportReport

TY - BOOK

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AU - Hansson, Lena

PY - 1988

Y1 - 1988

N2 - The volume changes of UO2 fuel pellets, produced by neutron irradiation, can be characterized by two processes: fission spike induced densification through pore shrinkage and later fission product induced swelling of UO2 matrix. In-pile densification is controlled by the initial density and microstructure of the fuel, particularly by the pore size distribution. The extent of swelling depends mainly on the amount of fission products produced, but the fission gas release as well as the swelling may be reduced by increasing the grain size of UO2. Fabrication of fuel pellets having certain in-reactor properties requires detailed knowledge of the effects of individual fabrication parameters. The irradiation experience of fuels fabricated by using different conversion and pelletizing methods is extensive. Based on this experience, some general characteristics of stable/well-performing fuel microstructures have been summarized.

AB - The volume changes of UO2 fuel pellets, produced by neutron irradiation, can be characterized by two processes: fission spike induced densification through pore shrinkage and later fission product induced swelling of UO2 matrix. In-pile densification is controlled by the initial density and microstructure of the fuel, particularly by the pore size distribution. The extent of swelling depends mainly on the amount of fission products produced, but the fission gas release as well as the swelling may be reduced by increasing the grain size of UO2. Fabrication of fuel pellets having certain in-reactor properties requires detailed knowledge of the effects of individual fabrication parameters. The irradiation experience of fuels fabricated by using different conversion and pelletizing methods is extensive. Based on this experience, some general characteristics of stable/well-performing fuel microstructures have been summarized.

KW - nuclear fuel pellets

KW - uranium oxides

KW - densification

KW - swelling

KW - gases

M3 - Report

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BT - Effects of UO2 fuel microstructure and density on fuel inreactor performance

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ER -

Hansson L. Effects of UO2 fuel microstructure and density on fuel inreactor performance. Espoo: VTT Technical Research Centre of Finland, 1988. 58 p. (Valtion teknillinen tutkimuskeskus. Tiedotteita; No. 830).