Assessment on mechanical effect of engineering barrier system to fault movement, 2

Saito, Yuya; Tanai, Kenji; Kikuchi, Hirohito*; Hirai, Takashi*; Nishimura, Mayuka*

JAEA-Research 2008-010, 35 Pages, 2008/03

JAEA-Research-2008-010.pdf:15.56MB

Site with the potential to adversely affect the performance of the disposal system should be avoided by site selection in Japan. On the other hand, according to Atomic Energy Commission, the possibility to occur the natural and artificial events suddenly should be examined. So it is important to examine about the critical state of the engineering barrier system (EBS) when if the fault move across the EBS. And this study helps to be understood by the nation. In this paper, we examined the influence of the velocity of fault movement by the model test, and tried to improve the precision of the simulation analysis. Test results showed that the total pressure of the buffer inside was about 20% decreased when the velocity was a one-tenth. And it is important to set the permeability of the near-field rock appropriately when simulating the behavior of the buffer material affected by fault movement.

Studies of superconducting alloys with structural changes induced by a mega-gravity

Nishio, Taichiro*; Hirai, Yuya*; Shimizu, Hideki*; Ono, Masao; Okayasu, Satoru; Ogata, Yudai*; Mashimo, Tsutomu*

no journal, , 

One of the ultimate goals in superconducting studies is the synthesis of a material which becomes superconducting at room temperature. However, the goal has not been in sight yet for more than 25 years after discovering a series of high-Tc copper-oxide superconductors. We think that behaviors of superconductors under extreme conditions give us a hint to obtain a higher transition temperature Tc. It is well known the Tc becomes higher under high pressure for most superconductors. The structual strain plays an important role for Tc. We forcus our attention to other structual strain caused by a mega-gravity. Under the mega-gravity, the heavier atoms move to the gravitational direction, and the lighter to the opposite. As a result, a different kind of strain can be applied. We show the changes of superconducting properties due to the maga-gravity for some superconductors.