Abstract
Palladium (Pd) is easily released from UO{sub 2} kernels in HTGR coated fuel particles, and reacts with SiC coating layer. In addition, Pd is one of metallic fission products in irradiation UO{sub 2}, which constitutes in dissoluble residue in reprocessing of LWR fuels. In the present investigation, the migration of palladium in UO{sub 2} was examined by heating diffusion pairs sandwiched Pd foil between UO{sub 2} wafers at 1300 {approx} 1800degC. Experiments were also carried out on affinity of Pd to UP{sub 2} and a formation of U-Pd alloy. Pd was found mainly in the pores of UO{sub 2}. The maximum depth intruded by Pd in fairly large amount was more than 100 {mu}m for UO{sub 2} with 90%TD and 50{mu}m for UO{sub 2} with 95%TD, while the maximum length of open pores was 330 {mu}m for UO{sub 2} with 90%TD, and 50 m for that with 95%TD. Fused Pd wetted UO{sub 2} very much. Pd intruded deeply into UO{sub 2}, especially in the edge of Pd droplet. Furthermore, U was detected either in precipitates or the Pd source with {alpha}-Pd phase of U-Pd alloy containing Pd at about 10at%. This fact indicates that Pd highly reacts with UO{sub 2}.
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Yoneyama, Mitsuru;
Sato, Seichi;
Ohashi, Hiroshi;
[1]
Ogawa, Toru;
Ito, Akinori;
Fukuda, Kousaku
- Hokkaido Univ., Sapporo (Japan)
Citation Formats
Yoneyama, Mitsuru, Sato, Seichi, Ohashi, Hiroshi, Ogawa, Toru, Ito, Akinori, and Fukuda, Kousaku.
Migration behavior of palladium in UO{sub 2}, (3).
Japan: N. p.,
1992.
Web.
Yoneyama, Mitsuru, Sato, Seichi, Ohashi, Hiroshi, Ogawa, Toru, Ito, Akinori, & Fukuda, Kousaku.
Migration behavior of palladium in UO{sub 2}, (3).
Japan.
Yoneyama, Mitsuru, Sato, Seichi, Ohashi, Hiroshi, Ogawa, Toru, Ito, Akinori, and Fukuda, Kousaku.
1992.
"Migration behavior of palladium in UO{sub 2}, (3)."
Japan.
@misc{etde_10112611,
title = {Migration behavior of palladium in UO{sub 2}, (3)}
author = {Yoneyama, Mitsuru, Sato, Seichi, Ohashi, Hiroshi, Ogawa, Toru, Ito, Akinori, and Fukuda, Kousaku}
abstractNote = {Palladium (Pd) is easily released from UO{sub 2} kernels in HTGR coated fuel particles, and reacts with SiC coating layer. In addition, Pd is one of metallic fission products in irradiation UO{sub 2}, which constitutes in dissoluble residue in reprocessing of LWR fuels. In the present investigation, the migration of palladium in UO{sub 2} was examined by heating diffusion pairs sandwiched Pd foil between UO{sub 2} wafers at 1300 {approx} 1800degC. Experiments were also carried out on affinity of Pd to UP{sub 2} and a formation of U-Pd alloy. Pd was found mainly in the pores of UO{sub 2}. The maximum depth intruded by Pd in fairly large amount was more than 100 {mu}m for UO{sub 2} with 90%TD and 50{mu}m for UO{sub 2} with 95%TD, while the maximum length of open pores was 330 {mu}m for UO{sub 2} with 90%TD, and 50 m for that with 95%TD. Fused Pd wetted UO{sub 2} very much. Pd intruded deeply into UO{sub 2}, especially in the edge of Pd droplet. Furthermore, U was detected either in precipitates or the Pd source with {alpha}-Pd phase of U-Pd alloy containing Pd at about 10at%. This fact indicates that Pd highly reacts with UO{sub 2}. From the above results, the transport of Pd in UO{sub 2} was explained by the model of gaseous diffusion through pores in UO{sub 2}, which is retarded by formation of U-Pd alloy. It is also indicated that UPd{sub 3} forms even at the oxygen potential condition of O/U ratio, which is a little higher than 2.00 on the basis of thermodynamic calculation. (author).}
place = {Japan}
year = {1992}
month = {Aug}
}
title = {Migration behavior of palladium in UO{sub 2}, (3)}
author = {Yoneyama, Mitsuru, Sato, Seichi, Ohashi, Hiroshi, Ogawa, Toru, Ito, Akinori, and Fukuda, Kousaku}
abstractNote = {Palladium (Pd) is easily released from UO{sub 2} kernels in HTGR coated fuel particles, and reacts with SiC coating layer. In addition, Pd is one of metallic fission products in irradiation UO{sub 2}, which constitutes in dissoluble residue in reprocessing of LWR fuels. In the present investigation, the migration of palladium in UO{sub 2} was examined by heating diffusion pairs sandwiched Pd foil between UO{sub 2} wafers at 1300 {approx} 1800degC. Experiments were also carried out on affinity of Pd to UP{sub 2} and a formation of U-Pd alloy. Pd was found mainly in the pores of UO{sub 2}. The maximum depth intruded by Pd in fairly large amount was more than 100 {mu}m for UO{sub 2} with 90%TD and 50{mu}m for UO{sub 2} with 95%TD, while the maximum length of open pores was 330 {mu}m for UO{sub 2} with 90%TD, and 50 m for that with 95%TD. Fused Pd wetted UO{sub 2} very much. Pd intruded deeply into UO{sub 2}, especially in the edge of Pd droplet. Furthermore, U was detected either in precipitates or the Pd source with {alpha}-Pd phase of U-Pd alloy containing Pd at about 10at%. This fact indicates that Pd highly reacts with UO{sub 2}. From the above results, the transport of Pd in UO{sub 2} was explained by the model of gaseous diffusion through pores in UO{sub 2}, which is retarded by formation of U-Pd alloy. It is also indicated that UPd{sub 3} forms even at the oxygen potential condition of O/U ratio, which is a little higher than 2.00 on the basis of thermodynamic calculation. (author).}
place = {Japan}
year = {1992}
month = {Aug}
}