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Takamizawa, Hisashi; Hata, Kuniki; Nishiyama, Yutaka; Toyama, Takeshi*; Nagai, Yasuyoshi*
Journal of Nuclear Materials, 556, p.153203_1 - 153203_10, 2021/12
Times Cited Count：3 Percentile：44.61(Materials Science, Multidisciplinary)Solute clusters (SCs) formed in pressurized water reactor surveillance test specimens neutron-irradiated to a fluence of 1 
10
n/cm
were analyzed via atom probe tomography to understand the effect of silicon on solute clustering and irradiation embrittlement of reactor pressure vessel steels. In high-Cu bearing materials, Cu atoms were aggregated at the center of cluster surrounded by the Ni, Mn, and Si atoms like a core-shell structure. In low-Cu bearing materials, Ni, Mn, and Si atoms formed cluster and these solutes were not comprised core-shell structure in SCs. While the number of Cu atoms in clusters was decreased with decreasing nominal Cu content, the number of Si atoms had clearly increased. The cluster radius (
) and number density (
) decreased and increased, respectively, with increasing nominal Si content. The shift in the reference temperature for nil-ductility transition (
RT
) showed a good correlation with the square root of volume fraction (
) multiplied by r (
). This suggested that the dislocation cutting through the particles mechanism dominates the precipitation hardening responsible for irradiation embrittlement. The negative relation between the nominal Si content and RT indicated that increasing of nominal Si content reduces the degree of embrittlement.
; ; ; ; ; *; *
JNC TN8400 2001-026, 29 Pages, 2001/12
JNC-TN8400-2001-026.pdf:0.99MB
The measurement condition by spectrophotometry was evaluated to measure Np content in MOX fuel containing Np. The Np concentration was obtained by measuring the 727nm absorption peak, after the valence of Np in the sample solution was adjusted to the Np(Ⅳ). The calibration curve showed the linearity up to Np concentration 0.8mg/ml. Though Pu and U quantity were respectively added to the Np solution to 30 times and 60 times of Np concentration, there was no effect to the Np analysis. By using this method, relative standard deviation (RSD) of the analyzed values of Np content for 2%Np - MOX fuel was about 4%. In addition, It was confirmed that the Np content could be measured without separating Np from Pu and U. This method can be sufficiently applied as a quick simple method to analyze Np content in MOX fuel containing Np.
Yagyu, Junichi; Arai, Takashi; Ogiwara, Norio; Saido, Masahiro;
JAERI-M 93-249, 43 Pages, 1994/01
no abstracts in English
*; *; *; Iida, Takao*; *; *
PNC TJ1545 93-005, 36 Pages, 1993/03
no abstracts in English
Onizawa, Kunio; ; ;
JAERI-M 90-202, 33 Pages, 1990/11
no abstracts in English
Suzuki, K.; Katano, Y.; Aruga, T.; Hamada, S.; Shiraishi, K.
Journal of Nuclear Materials, 133-134, p.585 - 589, 1985/00
Times Cited Count：2 Percentile：37.48(Materials Science, Multidisciplinary)no abstracts in English
Shindo, Masami; Kondo, Tatsuo
JAERI-M 83-118, 18 Pages, 1983/07
no abstracts in English
; Kondo, Tatsuo; Ogawa, Yutaka
JAERI-M 83-117, 14 Pages, 1983/07
no abstracts in English
; ; Machi, Sueo;
JAERI-M 9917, 51 Pages, 1982/02
no abstracts in English
Ogawa, Yutaka; Kondo, Tatsuo; ;
JAERI-M 8154, 12 Pages, 1979/02
no abstracts in English
; ;
Nihon Genshiryoku Gakkai-Shi, 3(12), p.942 - 948, 1961/00
no abstracts in English
