Development of separation technology of Mo by using iron oxide adsorbents (Contract research)

Kikuchi, Takahiro; Hoshi, Harutaka; Asakura, Toshihide; Morita, Yasuji; Kimura, Takaumi; Dodbiba, G.*; Fujita, Toyohisa*

JAEA-Research 2010-010, 45 Pages, 2010/07

JAEA-Research-2010-010.pdf:1.31MB

We have investigate that separation of Mo from simulated HLLW using various metal oxides adsorbent. Fe-Pb oxides and manganese oxide showed very high solubility in nitric acid solution. The distribution coefficient of Mo was decreased with increasing nitric acid concentration among tested adsorbents. Adsorption ability of Mo on alumina and cobalt oxide was low in 3M nitric acid. Hematite type iron oxide (Fe adsorbent) and amorphous zirconium oxide had high Mo adsorption ability, in 3M nitric acid. TRU, U and major fission products were not adsorbed on the adsorbent. So, separation of Mo can be achieved by using Fe adsorbent. A part of Mo was adsorbed irreversibly on Fe adsorbent, but reversibly-adsorbed Mo was recovered by oxalic acid, and the adsorbent was able to use repeatedly. Behavior of break-through of Mo is estimated from adsorption isotherm and overall mass transfer coefficient. We found that amount of throughput of Mo increased with decreasing grain size of the adsorbent.

Study on stability of CsSr solvent impregnated resin against irradiation

Hoshi, Harutaka; Kikuchi, Takahiro; Morita, Yasuji; Kimura, Takaumi

no journal, , 

Novel solvent impregnated resins (SIR), which have significant selectivity for Cs or Sr, were examined their stability against irradiation. SIR was soaked in nitric acid solution and was irradiated by Co source. After the irradiation, resin was filtrated and air-dried. The capacity of Cs or Sr was examined by batch method. The capacity reduced with nitric acid concentration, however, it was mainly caused by elution of impregnated extractant into aqueous phase. Thus, these resins indicated rather stability against irradiation. Selectivity was also examined through a column packed with irradiated resin. Cs or Sr was effectively separated from other typical fission products by using simulated high level liquid waste.

A Test case of clean-up of a radioactively-contaminated paddy field, 2; Evaluation of cesium behavior on paddy cultivation test

Yamashita, Yuji; Saso, Michitaka*; Kikuchi, Takahiro*; Kamoshida, Mamoru*

no journal, , 

We cultivated wet rice on the paddy field contaminated by radioactive cesium in Minamisouma city. We evaluated the effects of fertilization of a zeolite and a potassium manure on a transfer factor of radioactive cesium to the cultivated rice.

Corrosion behavior of weld joint of carbon steel overpack under geological environment, 2; Corrosion behavior of engineering scale testing

Yamazaki, Kazutoshi*; Takao, Hajime*; Kikuchi, Takahiro*; Kuriki, Yoshiro*; Kobayashi, Masato*; Kawakubo, Masahiro*; Shirase, Mitsuyasu*; Iwata, Yumiko*; Tochigi, Yoshikatsu*; Nakayama, Gen*; et al.

no journal, , 

Among factors affecting the corrosion behavior of carbon steel overpack, in order to consider materials (size) and realistic environmental factors which are difficult to reproduce in the laboratory scale test, engineering scale tests in the underground environment were carried out. A mock-up test of the same scale was also carried out on the ground with the aim of controlling and evaluating factors that govern the corrosion phenomenon. As a result of the test for about 3 years, there was no big difference between the average corrosion amount and the maximum corrosion amount of the simulated overpack base metal and the welded part. On the other hand, unlike the laboratory scale test, localization of corrosion due to the adhesion between the buffer material and the simulated overpack was also confirmed during the initial transient period.