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JAEA Reports

Inventories of LWR UO$$_{2}$$ spent fuel and ATR MOX spent fuel in Tokai reprocessing plant

Shirai, Nobutoshi; Inano, Masatoshi

JAEA-Research 2005-001, 7 Pages, 2005/11

JAEA-Research-2005-001.pdf:0.31MB

This report describes calculated results of inventory of radioactivity in the Tokai Reprocessing Plant with calculation code, based on initial conditions and nuclear data library. The inventories were compared with two types of spent fuels, U oxide for light water reactor and U-Pu mixed oxide for advanced thermal reactor.

JAEA Reports

Rotational states of CH$$_{3}$$CN selected using hexapole electric field (Cooperative research)

Hashinokuchi, Michihiro*; Okada, Michio*; Kasai, Toshio*; Moritani, Kosuke; Teraoka, Yuden

JAEA-Research 2005-002, 16 Pages, 2006/01

JAEA-Research-2005-002.pdf:0.91MB

The dynamical processes such as the energy transfer of a molecule to a surface, etc. play an important role in surface chemical reactions. An oriented-molecular-beam method can provide a great insight into these processes. We have developed a UHV-compatible oriented-molecular-beam machine. In the present study, we performed rotational-state selection of CH$$_{3}$$CN using hexapole electric field. We measured the focusing curve of CH$$_{3}$$CN, which was reproduced by the trajectory simulation including the second-order Stark effect in the inhomogeneous hexapole electric field. The expected orientation distributions suggest our ability to control the molecular orientation in surface reactions.

JAEA Reports

Development of Am-dispersed MgO target; Fabrication and characterization of simulated Am-dispersed MgO target

Miwa, Shuhei; Osaka, Masahiko; Tachi, Yoshiaki; Tanaka, Kenya

JAEA-Research 2005-003, 25 Pages, 2006/01

JAEA-Research-2005-003.pdf:3.29MB

In the technology for transmutation of Minor Actinides (MAs) to stable and short-lived nuclides by irradiation in the reactor, one promising candidate for the MA-containing ceramic form is a composite of MA compound and inert matrix, so called "target". In this study, surrogate target which is the combination of CeO$$_{2}$$ as a substitution of (Pu, Am)O$$_{2}$$ with MgO as the inert matrix is fabricated by a simple process based on commercial manufacturing technology for the present fuel. Structural analyses are performed by XRD, SEM observation and EDS analysis. From the results of analysis, the targets with high density, high homogenous dispersion of sphere, non reaction phase are obtained. Thermal stability and thermal conductivity of fabricated target are investigated. Dissolubility to nitride solution, thermal stability and thermal conductivity of fabricated target are investigated.

JAEA Reports

Purification of Na-smectite and preparation of oriented samples for diffusion experiments

Sato, Haruo

JAEA-Research 2005-004, 88 Pages, 2006/02

JAEA-Research-2005-004.pdf:7.04MB

Purification of Na-smectite and preparation of plated-oriented samples (membranous samples) were carried out, and a compacted smectite sample for diffusion experiment, of which orientation of smactite particles and interlayernaperture were controlled, was manufactured for trial. It was identified that the purified Na-smectite is approximately a homogeneously arranged Na-smectite from XRD measurements for oriented and powder samples. A compacted smectite sample for diffusion experiment, of which orientation of smectite particles and interlayer aperture were controlled, was manufactured for trial. Consequently, a compacted smectite sample with a dry density of about 1.8 Mg/m$$^{3}$$ and with only 2 water layers of interlayer aperture could be successfully manufactured for trial.

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