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Asazuma, Shinichiro; Takeda, Shinso; Toshihiko, Ohnishi,; Soma, Susumu; Onose, Ken ; Shoichi, Tajima,; Okada, Takashi
JNC TN8420 2004-001, 122 Pages, 2004/11
JNC-TN8420-2004-001.pdf:167.0MB
In order to prevent spread of contamination, glovebox dismantling activity is usually performed in a confined enclosure with personal radioactive protective equipment. Since large potion of these materials is made of vinyl acetate, there exist potential risks of fire, damage and injury to the environment and workers during the dismantling (cutting or melting) operation. It is therefore important to establish standard for proper use of equipment and hazard controls in such a specific environment. Working Group composed of Tokai Works and O-arai Works has examined and developed the operational standard for cutting work in glovebox dismantlement. The result is reflected to the Tokai Works Safety Operational Standard.
Mashima, Hidehisa; Tajima, Toshihiko*
no journal, ,
High magnesium andesites (HMAs) with island arc geochemical signatures are distributed in Nagasaki, Northwest Kyushu, Southwest Japan. The genesis of the Nagasaki HMAs cannot be explained by current flux melting models for HMA magmas since mantle xenoliths from NW Kyushu suggests that the NW Kyushu mantle is anhydrous. Normative Jd+CaTs-Ol-Qz compositions of the HMAs suggest that they were separated from their source mantle at 0.5 GPa. This abnormally low pressure partial melting would have been caused by the large contrast of lithospheric strength between the land area composed of the Nagasaki metamorphic rocks and the sea area where sedimentary basins have been formed. The large contrast of lithospheric strength would have concentrated mantle upwelling at the boundary between the land and the sea areas. In the genesis of the Nagasaki HMA magmas, the subduction of the Philippine Sea plate would habe played not as the source of hydrous components but as the driving force of strike-slip tectonics in NW Kyushu.
Bolton, P.; Abe, Mitsuyuki*; Akagi, Takashi*; Nuesslin, F.*; Hori, Toshihiko; Iwashita, Yoshihisa*; Kawanishi, Shunichi; Kondo, Kiminori; Maeda, Takuya; Molls, M.*; et al.
no journal, ,