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Conference Article: Irradiation behavior of boronated graphite for the HTTR

Matsuo, H. (Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment); Kobayashi, F.; Sawa, K. (Japan Atomic Energy Research Inst., Oarai, Ibaraki (Japan). Oarai Research Establishment)

Abstract

Two kinds of hot-pressed and cold-pressed boronated graphites containing 3 wt% or 30 wt% boron for use in the HTTR were studied. Neutron-irradiation was done up to a maximum fast neutron fluence 2x1025n/m2 (E>29fJ) at 550-1070 deg. C in the JMTR. Irradiation-induced dimensional changes, thermal expansivity and thermal conductivity from room temperature to high temperatures were measured after the irradiation. Dimensional changes and thermal expansivity depend on the direction measured and fabrication method, and thermal conductivity decreased and its temperature dependence changed after the irradiation. Furthermore the changes depend on boron content as well.

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key words: boron additions; dimensions; graphite; httr reactor; neutron fluence; physical radiation effects; post-irradiation examination; reactor components; temperature dependence; thermal conductivity; thermal expansion; variations; carbon; enriched uranium reactors; expansion; experimental reactors; gas cooled reactors; graphite moderated reactors; helium cooled reactors; htgr type reactors; nonmetals; physical properties; radiation effects; research and test reactors; thermodynamic properties
Reference:
Specialists' meeting on the status of graphite development for gas cooled reactors. Tokai, Ibaraki (Japan). 9-12 Sep 1991
International Atomic Energy Agency, Vienna (Austria)
IAEA-TECDOC--690, pp:210-219