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Migration behavior of palladium in UO{sub 2}, (3)

Technical Report:

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}.  More>>
Authors:
Yoneyama, Mitsuru; Sato, Seichi; Ohashi, Hiroshi; [1]  Ogawa, Toru; Ito, Akinori; Fukuda, Kousaku
  1. Hokkaido Univ., Sapporo (Japan)
Publication Date:
Aug 01, 1992
Product Type:
Technical Report
Report Number:
JAERI-M-92-118
Reference Number:
SCA: 220300; PA: JPN-92:012174; SN: 93000919876
Resource Relation:
Other Information: PBD: Aug 1992
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; COATED FUEL PARTICLES; PALLADIUM; RADIONUCLIDE KINETICS; URANIUM DIOXIDE; HTGR TYPE REACTORS; TEMPERATURE DEPENDENCE; DIFFUSION; PRECIPITATION; URANIUM ALLOYS; MELTING; INTERFACES; QUANTITY RATIO; 220300; FUEL ELEMENTS
OSTI ID:
10112611
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE93754309; TRN: JP9212174
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
55 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}