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Journal Articles

Residual stress distribution in water jet peened type 304 stainless steel

Hayashi, Makoto*; Okido, Shinobu*; Suzuki, Hiroshi

Quantum Beam Science (Internet), 4(2), p.18_1 - 18_12, 2020/06

JAEA Reports

Cutting operation of simulated fuel assembly heating examination by AWJ

Abe, Yuta; Nakagiri, Toshio; Watatani, Satoshi*; Maruyama, Shinichiro*

JAEA-Technology 2017-023, 46 Pages, 2017/10

JAEA-Technology-2017-023.pdf:8.01MB

This is a report on Abrasive Water Jet (AWJ) cutting work carried out on specimen, which was used for Simulated Fuel Assembly Heating Examination by Collaborative Laboratories for Advanced Decommissioning Science (CLADS) molten core behavior analysis group in February 2016. The simulated fuel assembly is composed of Zirconia for the outer crucible/simulated fuel, stainless steel for the control blade and Zircaloy (Zr) for the cladding tube/channel box. Therefore, it is necessary to cut at once substances having a wide range of fracture toughness and hardness. Moreover, it is a large specimen with an approximate size of 300 mm. In addition, epoxy resin has high stickiness, making it more difficult to cut. Considering these effects, AWJ cutting was selected. The following two points were devised, and this specimen could be cut with AWJ. If it was not possible to cut at one time like a molten portion of boride, it was repeatedly cut. By using Abrasive Suspension Jet (ASJ) system with higher cutting ability than Abrasive Injection Jet (AIJ, conventional method) system, cutting time was shortened. As a result of this work, the cutting method in Simulated Fuel Assembly Heating Examination was established. Incidentally, in the cutting operation, when the cutting ability was lost at the tip of the AWJ, a curved cut surface, which occurs when the jet flowed away from the feeding direction, could be confirmed at the center of the test body. From the next work, to improve the cutting efficiency, we propose adding a mechanism such as turning the cutting member itself for re-cutting from the exit side of the jet and appropriate traverse speed to protect cut surface.

JAEA Reports

Applicability test of abrasive water jet cutting technology for dismantling of the core internals of Fukushima Daiichi NPS

Nakamura, Yasuyuki; Iwai, Hiroki; Tezuka, Masashi; Sano, Kazuya

JAEA-Technology 2015-055, 89 Pages, 2016/03

JAEA-Technology-2015-055.pdf:17.54MB

It was reported that Fukushima Daiichi Nuclear Power Station (1F) had lost the cooling function of the reactor by the Tohoku Earthquake. It is assumed that the core internals became narrow and complicated debris structure mixed with the molten fuel. In consideration of the above situations, the AWJ cutting method, which has features of the long work distance and little heat effect for a material, has been developed for the removal of the molten core internals through cutting tests for 3 years since FY 2012. And it was confirmed that AWJ cutting method is useful for the removal of the core internals etc. The results in FY 2012 were reported in "R&D of the fuel debris removal technologies by abrasive water jet cutting technology (JAEA-Technology 2013-041)" and this report summarizes the results of FY 2012, 2013 and 2014 in this report. It was confirmed the possibility to apply the removal work of the fuel debris and the core internals.

Journal Articles

Nitrogen K-edge X-ray absorption near edge structure (XANES) spectra of purine-containing nucleotides in aqueous solution

Shimada, Hiroyuki*; Fukao, Taishi*; Minami, Hirotake*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji

Journal of Chemical Physics, 141(5), p.055102_1 - 055102_8, 2014/08

 Times Cited Count:14 Percentile:55.9(Chemistry, Physical)

JAEA Reports

Water jet intrusion into hot melt concomitant with direct-contact boiling of water

Shibamoto, Yasuteru

JAERI-Research 2005-016, 127 Pages, 2005/08

JAERI-Research-2005-016.pdf:4.54MB

no abstracts in English

Journal Articles

Improvement of high-voltage performance of acceleration tubes by cleaning the walls with a high-pressure water jet

Takeuchi, Suehiro; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Yoshida, Tadashi

Nuclear Instruments and Methods in Physics Research A, 513(3), p.429 - 438, 2003/11

 Times Cited Count:2 Percentile:21.84(Instruments & Instrumentation)

At the JAERI Tandem accelerator, an acceleration tube replacing plan is proceeding to increase the acceleration voltage toward 20 MV. Lengthy conditioning is generally necessary for a large tube system. We had an idea to clean the tubes with high-pressure water-jet rinsing before installation. We cleaned tubes and tested them at 1 MV and 3 MV. The both results exhibited that the voltages went beyond the rated voltages and discharge activities were much less than the old records. During the test of new tubes at 3 MV, the conditioning proceeded well and an extremely stable condition was fulfilled within 24 hours. In conclusion, the cleaning was found to be a very promising way to improve high-voltage performance of the tubes in a large tube system.

Journal Articles

Replacement of accelerator tubes of the JAERI tandem accelerator with tubes cleaned by a high-pressure water jet

Takeuchi, Suehiro; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Ishizaki, Nobuhiro; Matsuda, Makoto; Tsukihashi, Yoshihiro; Kanda, Susumu; Tayama, Hidekazu; Abe, Shinichi; Yoshida, Tadashi

Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.308 - 310, 2003/00

no abstracts in English

JAEA Reports

Lessons learned from remote dismantling activities of JPDR (Contract research)

Tachibana, Mitsuo; Shiraishi, Kunio; Yanagihara, Satoshi

JAERI-Tech 2001-014, 42 Pages, 2001/03

JAERI-Tech-2001-014.pdf:2.4MB

In the JPDR dismantling demonstration project, the dismantling activities were conducted for the purpose of verification of remote dismantling machines and collection of various kinds of data on work activities. These lessons were categorized into safety consideration, waste treatment and work efficiency by analyzing the data on work activities. Exemplified are necessities of facility information, efficiency of mock-up tests for evaluation of remote dismantling procedures. There will be useful for implementing other decommissioning projects in safe and efficiency. This report describes the measure taken for remote dismantling activities and the lessons learned from the dismantling activities.

JAEA Reports

Experimental study on the effect of nozzle surface finishing in high-speed water jet

Nakamura, Hiroshi; Ida, Mizuho*; Nakamura, Hiroo; Nakamura, Hideo; Ezato, Koichiro; Akiba, Masato

JAERI-Research 2000-068, 30 Pages, 2001/02

JAERI-Research-2000-068.pdf:3.88MB

no abstracts in English

Journal Articles

Optical measuremet of waves on high speed water jet

Ito, Kazuhiro*; Tsuji, Yoshiyuki*; Nakamura, Hideo; Kukita, Yutaka*

9th Int. Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-9)(CD-ROM), 16 Pages, 1999/00

no abstracts in English

Journal Articles

Experimental and analytical studies on high-speed plane jet along concave wall simulating IFMIF Li target flow

Nakamura, Hideo; Ito, Kazuhiro*; Kukita, Yutaka*; *; ; Maekawa, Hiroshi; Katsuta, Hiroji

Journal of Nuclear Materials, 258-263, p.440 - 445, 1998/00

 Times Cited Count:7 Percentile:55.14(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Water experiment of high-speed, free-surface, plane jet along concave wall

Nakamura, Hideo; *; Kukita, Yutaka*; *; ; Maekawa, Hiroshi

Eighth Int. Topical Meeting on Nuclear Reactor Thermal-Hydraulics (NURETH-8), 3, p.1268 - 1275, 1997/00

no abstracts in English

Journal Articles

Radiation effects and safety control of tritium, 2; Status of tritium use and source term

Noguchi, Hiroshi

Nihon Genshiryoku Gakkai-Shi, 39(11), p.915 - 916, 1997/00

no abstracts in English

Journal Articles

Thermohydraulic experiments on a water jet into vacuum during ingress of coolant event in a fusion experimental reactor

Ogawa, Masuro; Kunugi, Tomoaki

Fusion Engineering and Design, 29, p.233 - 237, 1995/00

 Times Cited Count:6 Percentile:55.97(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Techniques and experiences in decommissioning of Japan Power Demonstration Reactor

Fujiki, Kazuo; ; ;

Proc. of the Int. Conf. on Dismantling of Nuclear Facilities; Policies-Techniques, p.219 - 232, 1992/00

no abstracts in English

Journal Articles

Cutting technique and system for biological shield

Nakamura, Hisashi; *; Yanagihara, Satoshi

Nuclear Technology, 86, p.168 - 178, 1989/08

 Times Cited Count:5 Percentile:55.75(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Advance in the water jet cutting technology for nuclear reactor decommissioning in JAERI

; ; Yahiro, Teruo*

2nd Pacific RIM Int. Conf. on Water JET Cutting, 11 Pages, 1989/00

no abstracts in English

Journal Articles

Transient analysis of blowdown thrust force under PWR・LOCA conditions

; ;

Nihon Genshiryoku Gakkai-Shi, 24(9), p.723 - 733, 1982/00

 Times Cited Count:5 Percentile:54.1(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Transient analysis of blowdown thrust force under PWR LOCA

; ;

Nucl.Eng.Des., 75, p.157 - 168, 1982/00

 Times Cited Count:8 Percentile:69.02(Nuclear Science & Technology)

no abstracts in English

20 (Records 1-20 displayed on this page)
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