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JAEA Reports

Stabilization treatment of nuclear fuel material contained with organic matter

Senzaki, Tatsuya; Arai, Yoichi; Yano, Kimihiko; Sato, Daisuke; Tada, Kohei; Ogi, Hiromichi*; Kawanobe, Takayuki*; Ono, Shimpei; Nakamura, Masahiro; Kitawaki, Shinichi; et al.

JAEA-Testing 2022-001, 28 Pages, 2022/05

JAEA-Testing-2022-001.pdf:2.33MB

In preparation for the decommissioning of Laboratory B of the Nuclear Fuel Cycle Engineering Laboratory, the nuclear fuel material that had been stored in the glove box for a long time was moved to the Chemical Processing Facility (CPF). This nuclear fuel material was stored with sealed by a polyvinyl chloride (PVC) bag in the storage. Since it was confirmed that the PVC bag swelled during storage, it seems that any gas was generated by radiolysis of the some components contained in the nuclear fuel material. In order to avoid breakage of the PVC bag and keep it safety for long time, we began the study on the stabilization treatment of the nuclear fuel material. First, in order to clarify the properties of nuclear fuel material, radioactivity analysis, component analysis, and thermal analysis were carried out. From the results of thermal analysis, the existence of organic matter was clarified. Then, ion exchange resin with similar thermal characteristics was selected and the thermal decomposition conditions were investigated. From the results of these analyzes and examinations, the conditions for thermal decomposition of the nuclear fuel material contained with organic matter was established. Performing a heat treatment of a small amount of nuclear fuel material in order to confirm the safety, after which the treatment amount was scaled up. It was confirmed by the weight change after the heat treatment that the nuclear fuel material contained with organic matter was completely decomposed.

Journal Articles

The Evaluation of graft-adsorbent for removal of uranium from waste sludge

Seko, Noriaki; Tamada, Masao; Yoshii, Fumio

Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(4), p.340 - 345, 2004/12

https://doi.org/10.3327/taesj2002.3.340

Fibrous adsorbents having chelate agent such as amidoxime (AN/MAA-ad), iminodiacetic acid (IDA-ad), and phosphoric acid (HMPA-ad) were prepared by radiation-induced graft polymerization. AN/MAA-ad was synthesized by co-grafting of acrylonitrile and methacrylic acid. Then the introduced functional group of CN was converted to the amidoxime with chemical treatment. Grafting of glycidyl methacrylate and chemically introducing the IDA group synthesized IDA-ad. HMPA-ad was directly synthesized by grafting of phosphoric acid monomer. The densities of the chelate agency were 3.5 mol/kg for AN/MAA-ad, 2.0 mol/kg for IDA-ad and 2.0 mol/kg for HMPA-ad after the grafting time of 2, 1.5 and 8 hours, respectively. HMPA-ad had 200 times higher distribution coefficient for uranium than that of a commercial adsorbent (Diaion-PK216) at pH 0.5. The distribution coefficient for AN/MAA-ad became 500 times higher than that of Diaion-CR11 more than pH 8. These chelate adsorbents are promising materials for removal of uranium from acid or alkali treated waste sludge contaminated uranium.

Journal Articles

Application of radiation-graft material for metal adsorbent and crosslinked natural polymer for healthcare product

Tamada, Masao; Seko, Noriaki; Yoshii, Fumio

Radiation Physics and Chemistry, 71(1-2), p.223 - 227, 2004/09

https://doi.org/10.1016/j.radphyschem.2004.03.044

Times Cited Count：71 Percentile：96.47(Chemistry, Physical)

Graft polymerization and crosslinking in radiation processing were attractive techniques to modify conventional polymers. In the case of graftpolymerization, metal adsorbent was prepared by introducing the chelate function to trunk polymer like polyethylene. The obtained metal adsorbent was applied to the recovery of uranium in seawater. Three years' marine experiment revealed that 1kg of uranium could be collected by using graft-adsorbent. Natural polymers such as derivatives of starch and cellulose led irradiation crosslinking at paste-like condition and formed hydrogels. These hydrogels had degradability even after crosslinking. The mat of degradable hydrogel was effective to prevent bedsores as a healthcare product. After use, the hydrogel can be converted to fertilizer by decompositions.

Journal Articles

Development of toxic metal adsorbent with radiation-induced graft polymerization

Tamada, Masao

Kankyo Shigen Kogaku, 51(2), p.99 - 101, 2004/04

Fibrous chelate adsorbents have been synthesized by radiation-induced graft polymerization onto polyethylene nonwoven fabric. Graft polymerization was induced by electron beam irradiation to the trunk polymer. Then, irradiated trunk polymer was contacted with reactive monomer having function of chelate agent or its precursor. The precursor was chemically converted to chelate agent. The resulting fibrous chelate adsorbent gave the high space velocity more than 500 h $^{-1}$ in removal of lead from its solution. Such adsorbent was applied to the removal of cadmium from scallop processing waste and the removal of lead from the contaminated water which was produced by washing the inside of incinerator.

Journal Articles

Development of metal adsorbent with radiation induced graftpolymerization

Tamada, Masao

Oyo Butsuri, 72(4), p.453 - 456, 2003/04

https://ci.nii.ac.jp/naid/80015878539

Radiation induced graft-polymerization is sophisticated technique which is capable of introducing aiming functions into conventional polymers. Especially, pre-irradiation method is available for industrialization owing to discrete processes of irradiation and grafting. The chelate adsorbents having high selectivity against metals were synthesized by the graft-polymerization. The recovery of uranium from seawater and the removal of toxic metals from wastewater were described as applicable examples of the graft adsorbents.

Journal Articles

Behavior of iminodiacetate fiber in column-mode adsorption of lead(II)

Kugara, J.*; Trobradovic, H.*; Jo, Akinori*; Sugo, Takanobu; Tamada, Masao; Katakai, Akio

Nihon Ion Kokan Gakkai-Shi, 14(Suppl.), p.77 - 80, 2003/00

Chloromethylstyrene-grafted polyethylene-coated polypropylene fiber (0.9 denier) was functionalized by reaction with diethyl iminodiacetate and hydrolysis of the ester introduced. An acid capacity of the resulting chelating fiber (FIDA-f) was 4.3 meq/g. Although a maximum permissible flow rate of feeds was depressed with an increase in the conditioning pH of the FIDA-f column, breakthrough profiles of Pb(II) were independent of the flow rate of feeds up to 800/h in space velocity (SV). The usefulness of FIDA-f was demonstrated by quantitative removal of Pb(II) from 600 bed volumes of a Pb(II)-spiked river water (5 ppm) at a flow rate of SV 400/h.

Journal Articles

Radiation induced graft polymerization and its application to removal of toxic metals

Tamada, Masao

Hoshasen To Sangyo, (93), p.17 - 21, 2002/03

http://ci.nii.ac.jp/naid/40004433245

Radiation induced graft polymerization is useful technique for introducing aiming function into conventional polymers. Especially, preirradiation method can easily control the graft yield by irradiation dose and polymerization time. In this method, storing the irradiated polymer at low temperature is capable of grafting at discrete facility, which is merit for industrialization. Removal of toxic metals with grafted polymer needs the functions of ion exchange and chelating reaction. Graft polymerization is superior method to introduce such functions into the polymer. The fibrous adsorbent for lead ion, prepared by grafting, shows the high performance to the particle adsorbent.

JAEA Reports