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Akita, Koichi; Nakatani, Hayato*; Ogihara, Shinji*; Shobu, Takahisa; Shiro, Ayumi*; Igawa, Naoki; Shimojo, Yutaka
SPring-8/SACLA Riyo Kenkyu Seikashu (Internet), 6(1), p.105 - 108, 2018/01
no abstracts in English
Kaji, Yoshiyuki; Matsui, Yoshinori; Kita, Satoshi; Ide, Hiroshi; Tsukada, Takashi; Tsuji, Hirokazu
Nuclear Engineering and Design, 217(3), p.283 - 288, 2002/09
Times Cited Count：4 Percentile：29.25(Nuclear Science & Technology)In the Japan Atomic Energy Research Institute (JAERI), in-pile strain measurement techniques have been developed using the Japan Materials Testing Reactor (JMTR). In order to evaluate the performance of fiber optic grating sensors under irradiation environment, heat-up and performance tests at elevated temperatures before irradiation and in-pile tests were performed in JMTR. It was determined that it is possible to measure strain under irradiation environment below 1
1023n/m
(E
1MeV) by a fiber optic grating sensor, because in-pile temperature characteristics were in good agreement with out-of-pile test results.
Kaji, Yoshiyuki; Matsui, Yoshinori; Kita, Satoshi; Ide, Hiroshi; Tsukada, Takashi; Tsuji, Hirokazu
Nihon Genshiryoku Gakkai-Shi, 43(2), p.160 - 167, 2001/02
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Shobu, Takahisa; Shiro, Ayumi; Zhang, S.*; Yamada, Tomonori; Muramatsu, Toshiharu; Kono, Fumiaki; Ozawa, Takayuki
no journal, ,
The laser welding method is expected to be applied to the joint between inner and outer ducts for the fast reactor fuel assemblies with inner duct structure. In this study, an anneal effect of the residual stresses in the laser welded steel was investigated using the in-situ strain measurement technique with high energy synchrotron X-rays. We have succeeded in observation of the phenomenon that elastic strain is relaxed before annealing process and the dislocation density gradually decreases thereafter. In addition it was found that the FWHM is a useful parameter for in-situ evaluation of the heat treatment process to effectively optimize the heat treatment condition.
Saito, Toru; Ozeki, Hidemasa; Suwa, Tomone; Nabara, Yoshihiro; Kawano, Katsumi; Takahashi, Yoshikazu; Isono, Takaaki; Nunoya, Yoshihiko
no journal, ,
no abstracts in English
Tominaga, Aki; Shobu, Takahisa; Kamei, Naomitsu; Muramatsu, Toshiharu
no journal, ,
A joint exists in mechanical structure. The material used according to the use environment is also various for mechanical structure. The reliability is requested of the technology to which those are joined. Laser machining doesn't choose the material. It's expected that this is used as variety material junction technique and necessary welding technique. It's necessary to consider influence of a stress by the variety organization of the joint neighborhood, the mechanical property and the difference in the heat expansion coefficient between the variety metal together. To aim at generalization by this TAKUMI's technological calculation scientific simulation, permanent deformation spacial distribution inside the same kind material weld material between the carbon steel, the carbon steel and the variety material weld material of oxygen-free copper by a high powered fiber laser was measured and the special quality about the processing influence was estimated.
Tominaga, Aki; Shobu, Takahisa; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Nagai, Takayuki
no journal, ,
Glassy radioactive waste is a promising method for treating radioactive waste. Many kinds of elements are confined in the glass raw material. To stablish technology of confirm the stability for vitrified substances is required. We developed an analytical method for residual stress in vitrified radioactive waste samples using the analyzing from synchrotron-ray diffraction and scattering profile. We are studying application to various vitrified radioactive waste samples. We hope that this measurement method will be one of the methods for contributing to the solvation of vitrification technology.
Tominaga, Aki; Shobu, Takahisa; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Nagai, Takayuki
no journal, ,
High level radioactive vitrified materials are subject to monitoring during decades at storage facilities and over tens of thousands of years at final disposal sites. Although sufficient structural stability for long-term storage is necessary, high effluent filling which is often incompatible with mechanical and chemical integrity are required. The inhomogeneity of the glass yielded in preparation will cause the instability of the glass. Residual stress is one of the important parameters for evaluating the stability of the vitrified materials. Conventional stress measurement using a strain gauge reveal the averaged stress of whole specimen, however, local stress is also important because it can be an origin of the deformation or crack. Therefore, we developed a method using high-energy synchrotron X-ray stress measurements to clarify the local strain of the vitrified materials. Moreover, stress of each structural component such as crystalline and glass matrix can be separated by the method.
