Calculation of Critical Concentrations of Actinides in an Infinite Medium of Silicon Dioxide
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概要
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The critical concentrations of actinides in metal-silicon-dioxide (SiO2) and in metal-water (H2O) mixtures were calculated for 26 actinides including 233,235U, 239,241Pu, 242mAm, 243,245,247Cm, and 249,251Cf. The calculations were performed using the Monte Carlo neutron transport calculation code MCNP5 combined with the evaluated nuclear data library JENDL3.3. The results showed that the critical concentration of actinide in metal-SiO2 mixtures was about 1/5 of that in metal-H2O mixtures for all the fissile nuclides investigated. The k∞’s of metal-SiO2 and metal-H2O at one-half of the respective critical concentration of actinide, which was assumed as the subcritical concentration limit, were found to be less than 0.8 for all the actinides considered. By applying the sum-of-fractions rule to the concentrations of six nuclides in metal-SiO2 mixtures, the subcriticality of high-level radioactive wastes was confirmed for a reported sample. The effects of different nuclear data libraries on the results of critical concentrations were found to be large for 242Cm, 247Cm, and 250Cf by comparison with the results calculated with another evaluated nuclear data library, ENDF/B-VI.
- 社団法人 日本原子力学会の論文
- 2009-12-01
著者
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OKUNO Hiroshi
Japan Atomic Energy Agency
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SATO Shohei
Japan Atomic Energy Agency
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KAWASAKI Hiromitsu
ITOCHU Techno-Solutions Corporation
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