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Haraga, Tomoko; Kameo, Yutaka; Nakashima, Mikio
Bunseki Kagaku, 55(1), p.51 - 54, 2006/01
Times Cited Count：4 Percentile：14.43(Chemistry, Analytical)A relatively large quantity of sample solutions have to be prepared for radiochemical analysis of solidified products yielded by plasma melting treatment of non-metallic radioactive wastes. In order to dissolve the solidified products sample rapidly, dissolution method with microwave heating devices was applied. In a conventional method only by external heating with various mixtures of acids (HNO
, HF, HClO
and H
SO), a 0.1 g amount of the sample was dissolved with difficulty. However, applying the microwave assisted dissolution method, a 1 g amount of the sample was completely dissolved in a shorter time. Thereby the time for dissolution procedures was shortened less than a one-tenth. The present dissolution method was successfully applied to the blast furnace slag as a reference material to determine main elements with good precision.
Akaoka, Katsuaki; Maruyama, Yoichiro
Nihon Genshiryoku Gakkai Wabun Rombunshi, 4(2), p.127 - 134, 2005/06
The fractional distillation characteristics of the materials used for the reactor pressure vessel made of ASTM A302B and the structures in reactor made of SUS304 which are the radioactive metallic waste of Japan Power Demonstration Reactor (JPDR) were analyzed numerically. In the simulation, the vaporization rates of the components of the waste were calculated by using the Langmuir's equation and Henry's law. As the result of simulation, it was calculated that 
Eu, 
Eu, 
C and 
Nb can be reduced to less than clearance level by the fractional distillation. On the ASTM A302B case, it was pointed out that the other radioactive nuclei which are 
Mn, 
Fe, 
Co, 
Ni and 
Ni satisfy clearance level after 77 years cooling down. On the SUS304 case, it was pointed out that Ni and Ni must be separated to satisfy clearance level using isotope separation.
Akaoka, Katsuaki; Maruyama, Yoichiro
RIST News, (39), p.23 - 31, 2005/03
For the separation of radionuclide from the radioactive metallic waste generated by the decommissioning of nuclear facilities, a new method combined with the distillation and laser separation is being studied. The characteristics of fractional distillation for duralumin were analyzed numerically using the Henry's law and the Langmuir's equation, and its result agreed well with the experiment. Next, the fractional distillation characteristics of the materials used for the structures in reactor made of SUS304 which are the radioactive metallic waste of Japan Power Demonstration Reactor (JPDR) were analyzed numerically. As the result of the simulation, it was calculated that the radioactive metallic waste will be reduced to less than 1/100.
Akaoka, Katsuaki; Maruyama, Yoichiro
JAERI-Research 2004-012, 12 Pages, 2004/08
JAERI-Research-2004-012.pdf:3.52MB
The fractional distillation characteristics at between 0 
C and 2500 C(the rate is 200 C/h) of radioactive metallic waste for JPDR which mainly consists of stainless steel were analyzed numerically. In the simulation, the vaporization rates of the components of JPDR waste were calculated by using the Langmuir's equation and Henry's law. As the results, it was calculated that 
Eu, C and Nb can be removed by the fractional distillation. On the other hand, Mn and Fe can be reduced by cooling them for about 30 years. Therefore, by removing 
Ni and Co using laser separation method, it will be possible to reduce the radioactive metallic waste by less than one one-hundredth.
Nakamura, Hisashi; Fujiki, Kazuo
Nuclear Technology, 117(2), p.195 - 205, 1997/02
Times Cited Count：8 Percentile：56.29(Nuclear Science & Technology)no abstracts in English
Nakamura, Hisashi; Kanazawa, Katsuo; Sato, Takayuki; ; Fujiki, Kazuo
Dekomisshoningu Giho, (9), p.41 - 50, 1993/12
no abstracts in English
