Effect of Material Variables on the Irradiation Performance of Boron Carbide

Basmajian, J.A.; Hollenberg, GW

doi:10.1520/stp28237s

Cited by 1 publication

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“…It is reported that helium release is influenced by material parameters such as the pellet density, grain size and loB enrichment (14). However, from observation of the microstructure as shown in Photos.…”

Section: Microstructure and Helium Releasementioning

confidence: 99%

Effect of Fast Neutron Irradiation on the Properties of Boron Carbide Pellet.

Maruyama¹,

Onose²,

Kaito³

et al. 1997

J. Nucl. Sci. Technol.

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Boron carbide pellets were irradiated in the experimental fast reactor "JOYO" to log burnup of up to 1 7 0~1 0~~ cap/m3, fluences of 2x102'/m2 (E>0.1 MeV), and maximum temperatures of about 1,200"C. Post irradiation examinations were made of microstructural changes, helium release, swelling, and thermal conductivity.Boron carbide pellets irradiated to high burnups developed extensive cracking. Helium release from the pellets was initially low, but enhanced helium release was observed at high burnups and high temperatures. The swelling linearly increased with burnup, and when boron carbide was irradiated at high temperatures, the swelling rate began to decrease corresponding to the beginning of enhanced helium release. The correlation between swelling and the helium release was studied and the swelling was interpreted in terms of accumulation of helium in the boron carbide pellet. The thermal conductivity of the boron carbide pellets decreased rapidly by neutron irradiation accompanied with loss of temperature dependence.

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Section: Microstructure and Helium Releasementioning

confidence: 99%