148件が見つかりました。

並び替え
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第6回
A Study of Microstructure in an Alloy 182/ Low Alloy Steel Dissimilar Weld Joint
著者:
J. Hou, Q.J. Peng, J. Kuniya, T.Shoji
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The chemical composition, hardness, characterization of microstructure in fusion boundary region of di ssimilar welds between SQV2AQ low alloy steel and INCONEL Alloy 182 were evaluated. It was found that microstructure and composition transition region existed across the fusion boundary region. Composite carbide and Cr-carbide was observed, and martensite laths existed in both sides of the fusion boundary....
英字タイトル:
A Study of Microstructure in an Alloy 182/ Low Alloy Steel Dissimilar Weld Joint
第6回
B4C型長寿命制御棒の国内適用性についての検討
著者:
田嶋 智子,Satoko TAJIMA,林 大和,Yamato HAYASHI
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Westinghouse Electric Sweden AB Bjorn Rebensdorff Non Member Control rods mainly used in Japanese BWRs are applied boron carbide p owder as absorber material. In the case of conventional control rods are used for power control, a lot of nuclear wastes come up and time is needed to replac e control rods. In the U.S. and Europe, control rod applied boron carbide pin as absorber material is used for power control. This is long-lifed control rod called CR99, its design lifetime is more than 3 times compared wi...
英字タイトル:
Study on B4C long-lifed control rod applicability to Japanese plant
第6回
Effect of Overload on SCC Growth in Stainless Steels in High Temperature Water
著者:
He XUE, Qunjia PENG, Tetsuo SHOJI
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By incorporating the film slip-dissolution/oxidation model and the elastic-plastic finite element method (EPFEM), the effect of the over load on stress corrosion cracking (SCC) growth rate of stainless steel in high temperature water is discussed in this paper. Results sho w that SCC growth rate of a 20% cold worked 316L stainless steel in high temperature water decrease in the overload affected zone ahead of the growing crack tip. Therefore, a reasonable overload could availably reduce the SCC growth rat...
英字タイトル:
Effect of Overload on SCC Growth in Stainless Steels in High Temperature Water
第6回
EMAT を用いた配管減肉寸法計測法
著者:
小坂 大吾,Daigo KOSAKA,小島 史男,Fumio KOJIMA,山口 紘史,Hiroshi YAMAGUCHI
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his paper is concerned with quantitative evaluation of corrosion shape on outer surface of Pipe by Electro agnetic Acoust ic Transducer (EMAT). The pipe wall thinning was modeled semi ellipse shape. And FAC s been considered more dangerous. Th e pipe wall thinning was able to be measured with precision. In neral, FAC had a smooth surface wall thinning. EMAT were a ble to measure the echo in the test piece with 11 thinning of smooth enough. The EMAT is able to use to test for the FAC....
英字タイトル:
Measurement method of Pipe Wall Thinning Shape by EMAT
第6回
Impedance analysis of eddy current fields on inhomogeneous conductive medium with stress corrosion cracks
著者:
Taishi Okita, Toshiyuki Takagi, Tetsuya Uchimoto
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We numerically compute the impedance of the probe-coil as an eddy-current signal due to stress corrosion cracks (SCC) and/or fatigue cracks in the conductive an d nonmagnetic materials by using 3D finite element model. The fine shallow cracks with various structures are self-consistently simulated by providing zero-condu ctivity with a part of the background materials. We find the significant difference in the coil impedance, which crucially depends on the crack geometries. Our model and the obtained resu...
英字タイトル:
Impedance analysis of eddy current fields on inhomogeneous conductive mediumwith stress corrosion cracks
第6回
JRR-3 における計測制御装置の保全活動
著者:
井坂 浩二,Koji ISAKA,照沼 憲明,Noriaki TERUNUMA,大内 諭,Satoshi OHUCHI,大木 恵一,Keiichi OHKI,諏訪 昌幸,Masayuki SUWA
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JRR-3(Japan Research Reactor No.3) is a light water moderated and cooled, heavy water reflected, pool type research reactor with maximum thermal power of 20MW. The reactor is the first domes tic research reactor in Japan, and first criticality was attained in 1962. The large scale modification of the reactor was carried out for the year 1985-1990. As the modified JRR-3 has been operated for 18 years, it is necessary to be maintained for keeping the safe and stable operation. The review of maintenance activ...
英字タイトル:
Maintenance activities of instrumentation control device at JRR-3
第6回
JRR-4 反射体要素の割れ事象の発生及び今後の保全
著者:
坂田 茉美,Mami SAKATA,八木 理公,Masahiro YAGI,堀口 洋徳,Hironori HORIGUCHI,平根 伸彦,Nobuhiko HIRANE
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A crack was found on a weld area of one reflector element in JRR-4 on December 28, 2007. The following examinations were carried out, visual examination, dimensional examination, fract ography examination and so on. It was concluded that the main cause of the crack is the neutron-induced swelling of graphite in the reflector element. We tested radiographycally the oth er reflector elements. As the result, we determined that many of them were not in a suitable state to be used because of swelling of graphit...
英字タイトル:
Investigation of the Crack in a Reflector Element of JRR-4 and Future Maintenance
第6回
Ni 基合金溶接金属／低合金鋼異材溶接部近傍でのSCC 進展・停留挙動
著者:
石澤 允,Makoto ISHIZAWA,阿部 博志,Hiroshi ABE,渡辺 豊,Yutaka WATANABE
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The purpose of this study is to investigate the following items focused on the microstructure near the fusion boundary of dissimilar weld joint with Ni-based weld metal and low alloy steel; (1) Microstructural characteristics near the fusion boundary, (2) Dominant factor that makes crack retardation near the fusion boundary. Main conclusions can be summarized as follows; (1) From the results of CBB tests, it has been understood that the low alloy s teel has no SCC susceptibility and that there is a differ...
英字タイトル:
SCC propagation and cessation behavior near the fusion boundary of dissimilar weld jointwith Ni-based weld metal and low alloy steel
第6回
PD 資格試験開始から３年の実施状況
著者:
直本 保,Tamotsu JIKIMOTO,笹原 利彦,Toshihiko SASAHARA,秀 耕一郎,Koichiro HIDE
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The PD Center at the Central Research Institute of Electric Power Industry (CRIE PI) commenced Performance Demonstration examinations for flaw depth sizing of au stenitic stainless steel pipes in March 2006. As of April, 2009, 23 examination courses have been completed and 27 out of 38 candidates passed the examination....
英字タイトル:
Report on Performance Demonstration for depth sizing of austenitic stainless steel pipes
第6回
Sizing methodology of pipe wall thinning using inverse analysis with EMAT signal
著者:
NGUYEN Thanh Duong ,Fumio KOJIMA
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This paper proposes a method for sizing pipe wall thinning, using pulse-echo EMAT modes. First, the proposed method deploys a compact simulator model to eff iciently reduce the computational cost of EMAT forward analysis. Then, an approach of signal processing based on peak values at back-wall echo and POD method is applied to EMAT signal are introduced. Finally, inverse analysis based on reduced POD basics is applied for defect parameters identification. Promising e xperimental results with high accuracy ...
英字タイトル:
Sizing methodology of pipe wall thinning using inverse analysis with EMAT signal
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