Neutron Irradiation Effect on Isotopically Tailored 11B4C

被引：11

作者：

Morohashi, Yuko

Maruyama, Tadashi ^{[1
]}

Donomae, Takako ^{[2
]}

Tachi, Yoshiaki ^{[2
]}

Onose, Shoji ^{[2
]}

机构：

[1] Tokyo Inst Technol, Meguro Ku, Tokyo 1528550, Japan

[2] Japan Atom Energy Agcy, Oarai Res & Dev Ctr, Oarai, Ibaraki 3111393, Japan

来源：

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY | 2008年 / 45卷 / 09期

关键词：

boron carbide; isotope tailoring; enriched boron; swelling; thermal conductivity; neutron irradiation; helium bubble; lattice defect;

D O I：

10.3327/jnst.45.867

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The present investigation was carried out to elucidate the effects of neutron irradiation on the dimensional change and thermal conductivity of isotopically tailored (B4C)-B-11. The specimens used in the present investigation are 99% B-11-enriched (B4C)-B-11, 91% B-10-enriched (B4C)-B-10, and beta-SiC. (B4C)-B-10 was sampled from an irradiated material used as a neutron absorber in a "JOYO" MK-II control rod. The (B4C)-B-11 and SiC specimens were irradiated in the experimental fast reactor "JOYO" to fluences of 1.94 x 10(26) n/m(2) (E > 0.1 Me V) at 530 degrees C and 3.12 x 10(26) n/m(2) (E > 0.1 Me V) for (B4C)-B-10, with a B-10 burnup of 47.3 x 10(26) cap/m(3). Measurements on changes in dimensions and thermal conductivity, as well as postirradiation annealing Lip to 1400 degrees C, were carried out. The results of such measurements indicated that the changes in the dimensions and thermal conductivity of neutron-irradiated (B4C)-B-11 were substantially smaller than those of (B4C)-B-10 and SiC. Postirradiation annealing measurements for (B4C)-B-11 showed that the thermal conductivity was almost completely recovered at 1400 degrees C. The changes in thermal conductivity by annealing were analyzed in terms of phonon scattering theory. The onset of recovery of the thermal conductivity of (B4C)-B-11 agreed well with irradiation temperature; however, the recovery of length did not coincide with irradiation temperature.

引用

页码：867 / 872

页数：6

共 13 条

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