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Journal Articles

Mechanical properties of weldments using irradiated stainless steel welded by the laser method for ITER blanket replacement

Yamada, Hirokazu*; Kawamura, Hiroshi; Nagao, Yoshiharu; Takada, Fumiki; Kono, Wataru*

Journal of Nuclear Materials, 355(1-3), p.119 - 123, 2006/09

 Times Cited Count:3 Percentile:25.6(Materials Science, Multidisciplinary)

In this study, the bending properties of welding joint of irradiated material and un-irradiated material (irradiated/un-irradiated joints) were investigated using SS316LN-IG, which is the candidate material for the cooling pipe of ITER. The results of this study showed that the bending position of joints using un-irradiated material was un-irradiated part and that the bending position of irradiated/irradiated joints was fusion area or HAZ (heat affected zone). Although the bending position of joints was different bor the combination pattern between irradiated and un-irradiated materials, the bending strength of joint was almost same. Additionally, it is confirmed that bending strength did not depend on the combination pattern between the irradiated and un-irradiated materials, nor on the relationship between the heat input direction and the bending load direction.

Journal Articles

Reliable method for fission source convergence of Monte Carlo criticality calculation with Wielandt's method

Yamamoto, Toshihiro; Miyoshi, Yoshinori

Journal of Nuclear Science and Technology, 41(2), p.99 - 107, 2004/02

 Times Cited Count:35 Percentile:89.82(Nuclear Science & Technology)

A new algorithm of Monte Carlo criticality calculations for implementing Wielandt's method is developed. In this algorithm, part of fission neutrons emitted during random walk processes are tracked within the same generation, and thus a fission source distribution in the next generation spread more widely. Applying this method intensifies a neutron interaction effect even in a loosely-coupled array where conventional Monte Carlo criticality calculation methods have difficulties, and a converged fission source distribution can be obtained with fewer generations. Computing time spent for one generation, however, increases because of tracking fission neutrons within the same generation, which eventually results in an increase of total computing time up to convergence. However, since a fission source convergence is attained with fewer source iterations, a reliable determination of convergence can easily be made even in a system with a slow convergence.

Journal Articles

Enhanced multilayer relaxation at high-index stepped Cu surfaces

Yamaguchi, Masatake; Kaburaki, Hideo; Freeman, A. J.*

Physical Review B, 69(4), p.045408_1 - 045408_6, 2004/01

 Times Cited Count:13 Percentile:55.4(Materials Science, Multidisciplinary)

Multilayer relaxation at high-index Cu(hkl) (hkl = 511, 320, and 410) stepped surfaces were determined by the first-principles all-electron full-potential linearized augmented plane wave (FLAPW) method within the framework of the local density approximation (LDA) and the generalized gradient approximation (GGA). The calculated relaxation of the interlayer distances, obtained by a geometry optimization procedure that minimizes the force on each atom, were compared with low energy electron diffraction (LEED) analysis of experimental data. In the case of Cu(511), the calculated results are in good agreement with the LEED analyses. On the other hand, for Cu(320) and Cu(410), there are large differences that may be understood from the fact that the LEED analyses of experiments consider up to only three or four layers from the surface, and that whereas even the fifth or sixth layers show large relaxation in our calculations. Our results suggest a reanalysis of the LEED data with the inclusion of more layers.

Journal Articles

Charge-ordered state in single-crystalline CaFeO$$_{3}$$ thin film studied by X-ray anomalous diffraction

Akao, Tadahiro*; Azuma, Yusuke; Usuda, Manabu; Nishihata, Yasuo; Mizuki, Junichiro; Hamada, Noriaki*; Hayashi, Naoaki*; Terashima, Takahito*; Takano, Mikio*

Physical Review Letters, 91(15), p.156405_1 - 156405_4, 2003/10

 Times Cited Count:31 Percentile:79.13(Physics, Multidisciplinary)

X-ray anomalous diffraction, together with a band structure calculation, was employed to obtain a quantitative comprehension of the charge-ordering state in a single-crystalline CaFeO$$_{3}$$ thin film. The experimental results show a characteristic energy dispersion of the near inhibited reflection at 150, implying Fe atoms split into two distinct states. The energy dispersion is in good agreement with the calculated spectrum based on LDA+U scheme. The calculation reveals an electronic configuration of the Fe 3d orbital follows a localization in the oxygen orbital surrounds one of the distinct Fe atoms.

Journal Articles

Prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V$$_{2}$$O$$_{3}$$

Mo, S.-K.*; Denlinger, J. D.*; Kim, H.-D.*; Park, J.-H.*; Allen, J. W.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Kadono, Koji*; Suga, Shigemasa*; Saito, Yuji; et al.

Physical Review Letters, 90(18), p.186403_1 - 186403_4, 2003/05

A2003-0178.pdf:0.18MB

 Times Cited Count:134 Percentile:95.62(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Development of a filler metal for weldments of a Ni-Cr-W superalloy with high creep strength

Kurata, Yuji; Saito, T.*; Tsuji, Hirokazu; Takatsu, T.*; Shindo, Masami; Nakajima, Hajime

JSME International Journal, Series A, 45(1), p.104 - 109, 2002/01

no abstracts in English

Journal Articles

Development of a filler metal for weldments of a Ni-Cr-W superalloy with high creep strength

Kurata, Yuji; Saito, T.*; Tsuji, Hirokazu; Takatsu, T.*; Shindo, Masami; Nakajima, Hajime

Proceedings of the 7th International Conference on Creep and Fatigue at Elevated Temperatures (CREEP7), p.93 - 99, 2001/06

no abstracts in English

Journal Articles

Development of a filler metal for weldments of a Ni-Cr-W superalloy with superior creep strength

Kurata, Yuji; Saito, T.*; Tsuji, Hirokazu; Takatsu, T.*; Shindo, Masami; Nakajima, Hajime

Nihon Gakujutsu Shinkokai Genshiro Zairyo Dai-122-Iinkai Shiryoshu, p.279 - 282, 2000/11

no abstracts in English

JAEA Reports

Study on development of filler metal for Ni-Cr-W superalloy (Joint research)

Saito, T.*; ; Takatsu, T.*; Tsuji, Hirokazu; Shindo, Masami; Nakajima, Hajime

JAERI-Research 99-036, 99 Pages, 1999/05

JAERI-Research-99-036.pdf:29.53MB

no abstracts in English

Journal Articles

Improvement of creep resistance of a Ni base superalloy and its weld metal by controlling boron content

; *; *; *; Kondo, Tatsuo

Proc.Int.Conf.on Creep, p.97 - 102, 1986/00

no abstracts in English

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