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Nakamura, Yasuyuki; Sano, Kazuya; Morishita, Yoshitsugu; Maruyama, Shinichiro*; Tezuka, Shinichi*; Ogane, Daisuke*; Takashima, Yuji*
Journal of Engineering for Gas Turbines and Power, 133(6), p.064501_1 - 064501_3, 2011/06
Times Cited Count：1 Percentile：11.98(Engineering, Mechanical)Abrasive water jet (AWJ), is to shoot the abrasive mixed with high-pressure water to the material for cutting, can cut most materials like metals and concretes in water with long stand-off means the length from the cutting head to the material for cutting. On the other hand, AWJ is required to reduce an amount of the abrasive because it becomes the waste. It is also difficult to monitor the cutting condition by any visual methods like a TV camera in the water becoming cloudy by both used abrasive and cut metal grit. For solving these issues, some cutting tests were conducted and (1) It was possible to predict an optimal supply rate of abrasive by considering the conservation of momentum between the water jet and the abrasive. (2) It was also possible to judge whether the material could be cut successfully or not by detecting the change in the frequency characteristics of vibration or sound caused during the cutting process.
Nakamura, Yasuyuki; Iwai, Hiroki; Sano, Kazuya; Morishita, Yoshitsugu; Maruyama, Shinichiro*; Tezuka, Shinichi*; Ogane, Daisuke*; Takashima, Yuji*
Dekomisshoningu Giho, (38), p.43 - 52, 2008/11
The advanced thermal reactor (Fugen) at Fugen Decommissioning Engineering Center is characterized by its tube-cluster construction. As a part of the study of dismantling, we are considering the abrasive water jet (AWJ) technique that could be used for the dismantlement techniques of double-tubes (pressure tube and calandria tube) as one of possible methods. As a part of tests, we confirmed the possibility of abrasive recycle for cutting and the applicability of cutting monitoring technique for reducing the volume of secondary wastes and developing the cutting monitoring technique in the water.
Maruyama, Shinichiro*; Tezuka, Shinichi*; Ogane, Daisuke*
Mitsui Sumitomo Kensetsu Gijutsu Kenkyujo Hokoku (CD-ROM), (6), p.185 - 192, 2008/11
The advanced thermal reactor at the Fugen Nuclear Power Station is characterized by its tube-cluster construction. As a part of the study of dismantling, we are considering the abrasive water jet (AWJ) technique that could be used for the dismantlement techniques of double tubes (pressure tube and calandria tude) as one of possible methods. As a part of tests t, we confirmed the possibility of abrasive recycle for cutting and the applicability of cutting monitoring technique for reducing the volume of secondary wastes and developing the cutting monitoring technique in the water.
Nakamura, Yasuyuki; Kikuchi, Koichi; Morishita, Yoshitsugu; Usui, Tatsuo*; Ogane, Daisuke*
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 9 Pages, 2006/07
It is necessary to clarify the dismantlement method of 224 double tubes arranging both pressure and calandria tubes concentrically in the reactor as a peculiar problem of Fugen, in the case of phased dismantlement of the reactor. The machine type cutting is desirable, considering the influence on the atmospheres because the double tubes consist of the zirconium alloy and zircalloy material radio activated highly. Besides, Cutting method has long standoff to cut the double tubes at a time for to be short the term of dismantlement. is desirable. Therefore, it was examined to confirm the applicability to the double tubes cutting by abrasive water jet (hereinafter referred to as AWJ) as the machine type cutting method that can take the standoff comparatively longer. As a result, We confirmed for possibility of cutting the double tubes at a time from inside and outside tube, and cutting thick slab by abrasive water jet. Besides, We confirmed for relationship of abrasive supply and cutting velocity, properties of secondly waste.
Nakamura, Yasuyuki; Kikuchi, Koichi; Morishita, Yoshitsugu; Ogane, Daisuke*; Usui, Tatsuo*
no journal, ,
no abstracts in English
Nakamura, Yasuyuki; Morishita, Yoshitsugu; Kikuchi, Koichi; Usui, Tatsuo*; Ogane, Daisuke*
no journal, ,
As a peculiar issue of the decommissioning of FUGEN, it is necessary to establish a dismantlement method for the reactor having a 224 double-tubes structure arranged with pressure and calandria tubes concentrically. Mechanical cutting method will be desirable considering the influence on the atmospheres because the double-tubes consist of highly activated zirconium alloy and zircalloy material. Therefore, the abrasive water jet method was tested and examined as a mechanical double-tube cutting method that needs the standoff comparatively longer. We confirmed the applicability of the abrasive water jet method to the dismantlement of FUGEN's reactor. According to this cutting test, it is possible to cut slab at ca. 0.3-0.6kg/min of abrasive supply. (abrasive supply of AWJ is generally ca. 1.5-2.0kg/min.) And, 150mm thick of SUS were able to cut in the water by once.
Nakamura, Yasuyuki; Ogane, Daisuke*; Maruyama, Shinichiro*
no journal, ,
no abstracts in English
Iwai, Hiroki; Nakamura, Yasuyuki; Sano, Kazuya; Maruyama, Shinichiro*; Ogane, Daisuke*; Takashima, Yuji*
no journal, ,
no abstracts in English
