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Serizawa, Hiroyuki; Oishi, Yuji*; Haga, Yoshinori; Yamanaka, Shinsuke*; Tsuru, Tomohito; Kaji, Yoshiyuki; Matsunaga, Junji*; Kashibe, Shinji*
no journal, ,
We found that porous UO
grain was formed by the precipitation of helium injected by HIP. SEM analysis showed that polyhedral negative crystals were formed in the sample. The shape of the negative crystal changes dramatically with the conditions of helium precipitation. A truncated octahedron-type, an octa-triacontahedron and a pentacontahedron-type negative crystal were observed. The change in the precipitation condition means the variation in the activity of helium in matrix. So, our study implies that the shape of the negative crystal should changes depending on the helium inner pressure enclosed in the negative crystal.
Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*
no journal, ,
Chemical interface controlled dispersion and high-speed shearing water washing tests were carried out with highly radioactive contaminated soil of over 570,000 Bq/kg in Fukushima. In present experiment, ion plating AlO
ceramic coating was applied to SUS304 substrate material for prevention of radioactive contamination, and its erosion and decontamination performance were assessed. The following results were obtained. (1) Adhesion of fission product (FP) contained in refined soil particles was observed on the surface of SUS304 test coupons coated with 5 
m of AlO. In wipe-out tests, contaminated soil particles were easily removed from the surface of Al2O3 coated test coupon, whereas contaminated soil particles were tightly bound to the surface of uncoated SUS coupons.
Taguchi, Tomitsugu; Miwa, Shuhei; Igawa, Naoki; Birumachi, Atsushi; Yamaguchi, Kenji; Osaka, Masahiko
no journal, ,
The crystal structure and electron density distribution of simulated nuclear fuel, ceria solid solution were analyzed by the Rietveld method and the maximum entropy method using X-ray powder diffraction. The crystal structure was refined with the space group, 
, the same as UO. We observed that the electron density distributed between metal- oxygen site and oxygen-oxygen sites with the isosuface level of 0.4 e/
. Two-dimentional electron density distribution maps on (004) plain of the ceria solid solutions indicate that the shape and density of the electron diffusion path were affected by the dopants.