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Journal Articles

Development of PRW welding technology for 9Cr-ODS cladding tube

Seki, Masayuki; Kihara, Yoshiyuki; Kaito, Takeji; Tsukada, Tatsuya*; Motoki, Kazuhiko*; Hirako, Kazuhito*

Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 5 Pages, 2011/12

Oxide Dispersion Strengthened (ODS) steel has been developed as an advanced fuel cladding tube for sodium cooled fast reactors in Japan Atomic Energy Agency (JAEA) to attain the target burn up of 150 GWd/t in the bundle average because of its excellent swelling resistance and high mechanical strength in high temperature. If conventional TIG welding is applied to the ODS welding, it is difficult to obtain necessary mechanical strength at the weld zone because of the formation of porosity. It is formed by the argon bubbles which initially dissolve in the matrix and grow up under the high temperature during welding. Therefore JAEA has been conducted the development of pressurized resistance welding (PRW) technology for ODS cladding tube, which is one of the solid state welding methods. This paper describes in the development of PRW technology, an ultrasonic test method for detecting weld defects, the result of machine strength measurement examination in weld part and the result of fuel pin irradiation examination using nuclear reactor.

JAEA Reports

Manufacturing of ODS Test Pieces for Evaluation of Strength -Result of Test Pieces Manufacturing-

Kihara, Yoshiyuki; Seki, Masayuki; Fujio, Ishibashi,; Hirako, Kazuhiko*; Tsukada, Tatsuya*

JNC-TN8430 2005-002, 27 Pages, 2005/07

JNC-TN8430-2005-002.pdf:32.93MB

The irradiation test to gather the creep rupture data of the MARICO-2 test pieces manufactured from Oxide Dispersion Strengthened steel (ODS steel) cladding tube in JFY 2004. Therefore, to improve the reliability of the strength evaluation of the ODS steel cladding tube, it was planned to supplement the creep rupture data in that had been obtained so far. The strength evaluation test pieces supplied to this examination was manufactured by the request of the JNC OEC system nuclear fuel engineering group. This test pieces were manufactured by using Martensitic ODS and Ferritic ODS as well as MARICO-2 and CMIR-6. The specification of the test piece was same as two steel types. The problem did not occur for manufacturing the test pieces (20 pices of Martensitic ODS and 12 pices of Ferritic ODS) from April 5, 2005 to May 13, 2005. It was provided for JNC OEC System Division nuclear fuel group at the May, 2005.

JAEA Reports

Development of Welding Process for Oxide Dispersion Strengthened(ODS) Ferritic Steel

Seki, Masayuki; Ishibashi, Fujio; Kihara, Yoshiyuki; Hirako, Kazuhito*; Tsukada, Tatsuya*

JNC-TN8410 2005-009, 131 Pages, 2005/04

JNC-TN8410-2005-009.pdf:41.38MB

The development of the welding technology for the ODS steel was started in JFY1987. The first welding examination used the tungsten inert-gas (TIG) welding method and the YAG pulse laser welding method. However, the existing fusion welding methods significantly degrade strength at the welded section, because large size of blowholes appears at the weld and induce coagulation of oxides to generate coarser particles. To solve this problem, we have developed pressurized resistance welding (PRW) as a solid phase welding method.The appropriate conditions, e.g. electric current, voltage and contact force, were selected. For the PRW welded specimens, the tensile, internal burst and creep rupture tests were conducted and its integrity was confirmed. In addition, an ultrasonic inspection method has been developed to assure non-destructively integrity of the welding between cladding and end-plug.

JAEA Reports

Plug-Welding of ODS Cladding Tube for BOR-60 Irradiation Test-2; Determination of Welding Condition and Actual Results of Welding

Seki, Masayuki; Ishibashi, Fujio; Kihara, Yoshiyuki; Hirako, Kazuhiko*; Tsukada, Tatsuya*

JNC-TN8430 2004-003, 78 Pages, 2005/03

JNC-TN8430-2004-003.pdf:61.9MB

Irradiation test in BOR-60 at RIAR to judge practical use prospect of ODS cladding tube at early stage is planned as Japan-Russia a joint research. Irradiation test is done for five years from June, 2003 aiming at burn-up 15at%.The first stage irradiation test was achieved target burn-up 5at% in May, 2004.The second stage irradiation test begins in May, 2005. JNC Tokai welded martensitic ODS cladding tube and upper endplug by pressurizing resistance welding, and inspected, it was transported to RIAR. As well as last time, Use of long scale cladding tube caused problem that bending transformation occurred in cladding tube by welding pressure. However, we solved this problem by adopted a changeable pressurizing system. This system can suppress the transformation of the cladding tube because it can set the pressurizing power when beginning to connect it low. Manufacturing was enabled by using this system. A permissible value of the welding condition was expanded by having adopted the changeable pressurizing system, it has a advantage for the design of the hot device. The cladding tubes with upper endplug passed the inspection by OEC on 15 December 2004 were shipped on 13 January 2005 for RIAR.

JAEA Reports

Manufacturing of ODS Test Pieces for MARICO-2 and CMIR-6; Results of Test Pieces Manufacturing

Seki, Masayuki; Ishibashi, Fujio; Kihara, Yoshiyuki; Tsukada, Tatsuya*; Hirako, Kazuhiko*

JNC-TN8430 2004-002, 49 Pages, 2005/03

JNC-TN8430-2004-002.pdf:72.34MB

The irradiation test by MARICO-2 and CMIR-6 is planned aiming to the irradiation characteristic of ODS cladding tube. The test pieces of MARICO-2 and CMIR-6 were manufactured by using Martensitic ODS cladding tube and Ferritic ODS cladding tube. The specification of the test pieces was same as two steel type. The test pieces of Martensitic ODS were manufactured from February 19, 2004 to March 11, 2004.(MARICO-2:38test pieces (in clueded 11pieces reserve and QA sample) and CMIR-6:6 test pieces). The test pieces of Ferritic ODS was manufactured from August 17, 2004 and September 22, 2004.(MARICO-2:32test pieces(in clueded 11pieces reserve and QA sample) and CMIR-6:6 test pieces). The problem did not occur for manufacturing the test pieces. Martensitic ODS test pieces was provided for JNC OEC System Division Nuclear fuel group at the May 2004 and Ferritic ODS test pieces was provided for JNC OEC System Division Nuclear fuel group at the October 2004.

JAEA Reports

Development of Quality Assurance System for Resistance Welding by Ultrasonic Examination -Fabrication of STB for Resistance Welding and Ultrasonic Examination-

Kono, Shusaku; Seki, Masayuki; Fujio, Ishibashi,; Hirako, Kazuhiko*; Tsukada, Tatsuya*

JNC-TN8430 2003-010, 28 Pages, 2003/07

JNC-TN8430-2003-010.pdf:2.18MB

The defect occurred at the resistance welding zone is very minute and therefore cannot be identified by X-ray inspection. Then, the ultrasonic examination method, in which the resolution of the defect is higher than that of the X-ray inspection method, has been developed. The ultrasonic wave sounds straight easier in the material than X rays, excels in defecting the micro defect. However, the pulse amplitude of ultrasonic wave is influenced by the shape and direction of the defect. Then, the ultrasonic inspection equipement, in which the ultrasonic probe and the sample rotation axis are controlled to drive with the pulse motor and the defect data (position and size)are analized by image processing ultrasonic signal, was developed to measure the shape and the position of defect accurately. However, an ultrasonic examination method is the comparative inspection method. Therefore, the standard test block or the reference block is indispensable to guarantee the defectability and the ultrasonic echo sensibility of the inspection device. The standard test block is provided in JIS etc, it is needed to defect the peculiar defect occurred at the resistance welding zone. Then, the method of processing a standard test block is examined, the standard test block was made experimentally by electric discharge processing and diffusion junction method. The ultrasonic echo sensitivity and the threshold for image processing were proofread by using the standard test block, the ultrasonic inspection and metallographic inspection were executed. Comparing the ultrasonic inspection results with the metallographic inspection results, the detectability of defect depth and the measurement accuracy were proved to be 3$$mu$$m and with errors less than 10$$mu$$m respectively. From these results, the effectireness of proofreading the ultrasonic inspection condition by the standard test block was confirmed. Moreover, it was confirmed that there was a peculiar relationship between the depth ...

JAEA Reports

Development of Resistance Welding Process(VI)

Kono, Shusaku; Seki, Masayuki; Ishibashi, Fujio; Hirako, Kazuhiko*; Tsukada, Tatsuya*

JNC-TN8410 2003-009, 108 Pages, 2003/05

JNC-TN8410-2003-009.pdf:9.54MB

The welding condition and the heat-treatment condition were optimized to evaluate welding properties of the martensitic ODS steel cladding tube. The test pieces for evaluation of strength properties of the welded zone were produced by the optimized welding condition. In order to evaluate the strength of the welded zone, the internal creep rapture test, the single axis creep rapture test, the burst test and the tensile test were conducted. Following results were obtained in these tests. (1)Weld ability. An excellent welding characteristic was observed. The micro cracks, etc. were not served at the joint starting point. The joint starting poonts were connected uniformly with errors less than 0.05mm. It is considered that an excellent welding characteristic was result of homogeneous micro structure of cladding material. (2)End plug material. In case of the material of end plug was martensitic ODS steel as same as that of cladding tube, the micro structure and the precipitation state carbide near the welded zone were found to be almost same as that of cladding tube. (3)Optimization of heat-treatment condition. The heat treatments of normalizing (10501$$^{circ}$$C) and tempering (780$$^{circ}$$C) were performed after welding and the micro structure near the welded zone was the isometric structure with low dislocation density, the precipitation state of carbide was uniform as same as that of cladding tube. These heat treatments can relax the residual stress accumulated when welding; it is considered that these heat treatments after welding are indispensable. (4)Strength of welded zone. The strength of the welded zone was found to be equal to that of cladding tube in all the strength tests. Therefore, it is concluded that the welding technology for the martensitic ODS steel is completed.

JAEA Reports

None

Nishiyama, Motokuni; Kamimura, Katsuichiro; Seki, Masayuki; Tsukada, Tatsuya*; Ishibashi, Fujio; Isaka, Kazuhiko*

PNC-TN8410 95-046, 81 Pages, 1995/01

PNC-TN8410-95-046.pdf:4.07MB

None

Oral presentation

Development of PRW technology for ODS steel, 12; Strength evaluation test by using artificially-defected test pieces

Seki, Masayuki; Kihara, Yoshiyuki; Hirako, Kazuhito*; Motoki, Kazuhiko*; Tsukada, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Development of PRW technology for ODS steel, 13-2; Strength evaluation test with artificially-defected test pieces

Seki, Masayuki; Kihara, Yoshiyuki; Tsukada, Tatsuya*; Motoki, Kazuhiko*; Hirako, Kazuhito*

no journal, , 

no abstracts in English

Oral presentation

The Performance evaluation of electron tracking Compton camera for medical imaging

Sonoda, Shinya*; Nabetani, Akira*; Kimura, Hiroyuki*; Kabuki, Shigeto*; Takada, Atsushi*; Kubo, Hidetoshi*; Kimura, Shotaro*; Sawano, Tatsuya*; Tanimori, Toru*; Matsuoka, Yoshihiro*; et al.

no journal, , 

We have developed the ETCC for new medical imaging device and succeeded in imaging the some medical imaging reagents. Thus, this detector is thought promising for a new medical imaging. The F-18 point-like and rod-like phantoms are measured with new ETCC, and the imaging performance was estimated. In addition, measurement of Tc-95m which is produced by Japan Atomic Energy Agency was performed.

Oral presentation

Application of Electron Tracking Compton Camera (ETCC) in medical imaging

Sonoda, Shinya*; Nabeya, Akira*; Kimura, Hiroyuki*; Kabuki, Shigeto*; Takada, Atsushi*; Kubo, Hidetoshi*; Komura, Shotaro*; Tanimori, Toru*; Matsuoka, Yoshihiro*; Mizumura, Yoshitaka*; et al.

no journal, , 

SPECT and PET are widely used for medical imaging. However, radio isotopes available for SPECT and PET are limited. Under these circumstances, it is expected the appearance of the new $$gamma$$ imaging detector which can measure more various kinds of $$gamma$$-ray sources in order to develop new biomarkers using new radio isotopes. We set out to contribute to medical imaging technology by developing Electron-Tracking Compton Camera (ETCC) which can measure the various radioactive medicine.

Oral presentation

Application of Electron Tracking Compton Camera (ETCC) in medical imaging

Sonoda, Shinya*; Nabetani, Akira*; Kimura, Hiroyuki*; Kabuki, Shigeto*; Takada, Atsushi*; Kubo, Hidetoshi*; Komura, Shotaro*; Sawano, Tatsuya*; Tanimori, Toru*; Matsuoka, Yoshihiro*; et al.

no journal, , 

We present the performance results using this new ETCC such as the imaging test using F-18 in point-like and rod-like phantoms with varying the intense of radiation. In addition, the measurementof Tc-95m which is produced by Japan Atomic Energy Agency was performed. Tc-95m emitsthe $$gamma$$-rays with the energy, 204, 583, and 835 keV, and then an image with multi-energies is examined. The position resolution achieves less than about 8 degrees from 10 degrees at 511 keV by this improvement. Further improvement of the angular resolution (position resolution) will be presented until 2015 spring. Also, we are developing the next ETCC by increasing the thickness of the scintillator from 1 rad. to 2 rad. and the gas pressure from 1 atm to 3 atm which improvethe detection efficiency by a factor of $$>$$ 5 at 511 keV. By these improvements, the imaging time of mouse is expected to be reduced from several hours with to $$<$$20 minutes for lots of kinds of RIs with the energy band from 0.1-2 MeV.

Oral presentation

R&D of advanced stainless steels for BWR fuel claddings, 3-6; End-plug joining test applying PRW technique

Tanno, Takashi; Yano, Yasuhide; Tsukada, Tatsuya*; Sakamoto, Kan*; Yamashita, Shinichiro

no journal, , 

no abstracts in English

Oral presentation

R&D of advanced stainless steels for BWR fuel claddings, 3-6; End-plug joining test applying PRW technique

Tanno, Takashi; Yano, Yasuhide; Tsukada, Tatsuya*; Sakamoto, Kan*; Yamashita, Shinichiro

no journal, , 

FeCrAl-ODS stainless steel cladding with Al has been developed to improve oxidation resistance for accident tolerant fuel of LWRs. The strength of weld part may decrease due to growth of fine oxide particles, when the weld method with fusion is used for the end cap joining of FeCrAl-ODS stainless steel. For FeCrAl-ODS stainless steel cladding for fast reactors, the pressurization resistance welding (PRW) mood which is solid-state welding has been developed by an atomic organization. It is reported the results of joining tests that applied the PRW method about a FeCrAl-ODS stainless steel.

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