Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Irisawa, Keita; Kudo, Isamu*; Taniguchi, Takumi; Namiki, Masahiro*; Osugi, Takeshi; Nakazawa, Osamu
QST-M-16; QST Takasaki Annual Report 2017, P. 63, 2019/03
no abstracts in English
Irisawa, Keita; Kudo, Isamu*; Taniguchi, Takumi; Namiki, Masahiro*; Osugi, Takeshi; Nakazawa, Osamu
QST-M-8; QST Takasaki Annual Report 2016, P. 63, 2018/03
A solidification technique with minimized water content is being developed using a phosphate cement for safe storage of secondary radioactive wastes in the Fukushima Daiichi Nuclear Power Plant. To understand the applicability of the solidification technique for the actual secondary wastes, phosphate cement during dehydration was irradiated by Co
-ray. The G(H
) for the phosphate cement decreased with time during dehydration, and was not detected after 7 days. Moreover, the
Co
-ray irradiation during dehydration did not change the crystalline and amorphous phases of the phosphate cement.
Irisawa, Keita; Yeung, S. W.*; Suriwong, P.*; Kinoshita, Hajime*
no journal, ,
In order to evaluate the applicability of calcium aluminate phosphate (CAP) cement as a matrix for nuclear wastes, we investigated the compositional effects on the CAP cement focusing on the caesium incorporation. The CAP samples were prepared by mixing calcium aluminate cement (CAC) with the aqueous solution of (NaPO)
and CsNO
. CsNO
re-precipitated in the conventional CAC sample, suggesting a limited interaction of CAC with CsNO
. The increase in the polyphosphate content limited the conventional hydration of CAC and the relative amount of CsNO
re-precipitation. This is interesting as it may show a potential interaction between CAP matrix and CsNO
.
Garca-Lodeiro, I.*; Lebon, R.*; Mahoney, D.*; Zhang, B.*; Irisawa, Keita; Osugi, Takeshi; Nakazawa, Osamu; Kinoshita, Hajime*
no journal, ,
Leaching tests have been conducted on CAC and CAP systems prepared with minimised water content, containing simulated secondary aqueous wastes to investigate their feasibility as wasteforms. In CAC, the effect of reduction in water content on leaching was small whereas CAP system indicated a significant benefit of reduction in water content. CAP appears to be beneficial to retain alkaline earth elements such as Sr, when cured at elevated temperatures.
Irisawa, Keita; Kudo, Isamu*; Taniguchi, Takumi; Namiki, Masahiro*; Osugi, Takeshi; Nakazawa, Osamu
no journal, ,
no abstracts in English
Irisawa, Keita; Kudo, Isamu*; Taniguchi, Takumi; Namiki, Masahiro*; Osugi, Takeshi; Nakazawa, Osamu
no journal, ,
no abstracts in English
Irisawa, Keita; Taniguchi, Takumi; Namiki, Masahiro*; Garca-Lodeiro, I.*; Osugi, Takeshi; Nakazawa, Osamu; Kinoshita, Hajime*
no journal, ,
no abstracts in English
Taniguchi, Takumi; Irisawa, Keita; Namiki, Masahiro*; Nakazawa, Osamu
no journal, ,
no abstracts in English