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Journal Articles

The Maintenance management of thickness measurement on the water tube boiler

Nishino, Shohei; Motohashi, Masahiro; Nishida, Tetsuro; Kawasaki, Ichio

Nihon Hozen Gakkai Dai-19-Kai Gakujutsu Koenkai Yoshishu, p.73 - 79, 2023/08

There are 4-boiler in Nuclear fuel Cycle engineering Laboratories (NCL). These boilers have been operated in the long term over 29 years. There are many water tube as one of many identical components which together make up a boilers. The leakage from water tube have occurred four times in recently. It was presumed that sulfur acid corrosion had caused the leakage. Therefore, to reduce generation of sulfuric acid corrosion, the operation term was changed to long, and regular inspection (non-destructive testing) have been carried out.

JAEA Reports

Annual report on the effluent control of low level liquid waste in Nuclear Fuel Cycle Engineering Laboratories FY2014

Watanabe, Hitoshi; Nakano, Masanao; Fujita, Hiroki; Kono, Takahiko; Inoue, Kazumi; Yoshii, Hideki*; Otani, Kazunori*; Hiyama, Yoshinori*; Kikuchi, Masaaki*; Sakauchi, Nobuyuki*; et al.

JAEA-Review 2015-030, 115 Pages, 2015/12

JAEA-Review-2015-030.pdf:25.28MB

Based on the regulations (the safety regulation of Tokai reprocessing plant, the safety regulation of nuclear fuel material usage facilities, the radiation safety rule, the regulation about prevention from radiation hazards due to radioisotopes, which are related with the nuclear regulatory acts, the local agreement concerning with safety and environment conservation around nuclear facilities, the water pollution control law, and bylaw of Ibaraki prefecture), the effluent control of liquid waste discharged from the Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency has been performed. This report describes the effluent control results of the liquid waste in the fiscal year 2014. In this period, the concentrations and the quantities of the radioactivity in liquid waste discharged from the reprocessing plant, the plutonium fuel fabrication facilities, and the other nuclear fuel material usage facilities were much lower than the limits authorized by the above regulations.

Journal Articles

Development of methods for removing the deposit in the combustion chamber of the water tube boiler

Kawasaki, Ichio; Ishiyama, Toru; Nishino, Shohei; Aoki, Masaru*

Boira Kenkyu, (391), p.8 - 14, 2015/06

no abstracts in English

JAEA Reports

Annual report on the effluent control of low level liquid waste in Nuclear Fuel Cycle Engineering Laboratories FY2013

Watanabe, Hitoshi; Nakano, Masanao; Fujita, Hiroki; Kono, Takahiko; Inoue, Kazumi; Yoshii, Hideki*; Otani, Kazunori*; Hiyama, Yoshinori*; Goto, Ichiro*; Kibe, Satoshi*; et al.

JAEA-Review 2014-040, 115 Pages, 2015/01

JAEA-Review-2014-040.pdf:4.26MB

Based on the regulations (the safety regulation of Tokai reprocessing plant, the safety regulation of nuclear fuel material usage facilities, the radiation safety rule, the regulation about prevention from radiation hazards due to radioisotopes, which are related with the nuclear regulatory acts, the local agreement concerning with safety and environment conservation around nuclear facilities, the water pollution control law, and bylaw of Ibaraki prefecture), the effluent control of liquid waste discharged from the Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency has been performed. This report describes the effluent control results of the liquid waste in the fiscal year 2013. In this period, the concentrations and the quantities of the radioactivity in liquid waste discharged from the reprocessing plant, the plutonium fuel fabrication facilities, and the other nuclear fuel material usage facilities were much lower than the limits authorized by the above regulations.

JAEA Reports

Annual report on the effluent control of low level liquid waste in Nuclear Fuel Cycle Engineering Laboratories FY2012

Sumiya, Shuichi; Watanabe, Hitoshi; Miyagawa, Naoto; Nakano, Masanao; Fujita, Hiroki; Kono, Takahiko; Inoue, Kazumi; Yoshii, Hideki; Otani, Kazunori*; Hiyama, Yoshinori*; et al.

JAEA-Review 2013-041, 115 Pages, 2014/01

JAEA-Review-2013-041.pdf:19.01MB

Based on the regulations (the safety regulation of Tokai reprocessing plant, the safety regulation of nuclear fuel material usage facilities, the radiation safety rule, the regulation about prevention from radiation hazards due to radioisotopes, which are related with the nuclear regulatory acts, and the local agreement concerning with safety and environment conservation around nuclear facilities, the water pollution control law, and bylaw of Ibaraki prefecture), this report describes the effluent control results of liquid waste discharged from the JAEA's Nuclear Fuel Cycle Engineering Laboratories in the fiscal year 2012, from 1st April 2012 to 31st March 2013. In this period, the concentrations and the quantities of the radioactivity in liquid waste discharged from the reprocessing plant, the plutonium fuel fabrication facilities, and the other facilities were much lower than the authorized limits of the above regulations.

Oral presentation

Development of removal method for the deposit in the boiler system

Nishino, Shohei; Ishiyama, Toru; Kawasaki, Ichio

no journal, , 

The purpose of this R&D is the development of removal method for the deposit and the countermeasure of corrosion by solute in the boiler system. In the boiler system, sulfur and iron oxide accumulated on the bottom and stiffened on there. Because the property of this deposit changed to strong acidity, then the generating tube was corroded by it. And the leakage, occurred at generating tube, was found at Dec. 2011. The property of deposit was too hard to remove by pressurized water, and width of each pipe was too narrow to remove by mechanical method, because there was several thousands of generating tube every 30 mm on the bottom. Therefore the effect of lab examination, corrosion test based on materials of the generated tube, was evaluated.

Patent

水管ボイラ内の堆積物除去方法及び装置

川崎 一男; 石山 道; 西野 将平

田村 欣也*

JP, 2014-104370  Patent licensing information  Patent publication (In Japanese)

【課題】水管ボイラ内が複雑かつ狭隘であっても、安価で、かつ簡略な構造で、洗浄対象物である水管に付着した堆積物の剥離を効率よく実現できる水管ボイラ内の堆積物除去方法及び装置を提供する 【解決手段】水管ボイラ内に圧力を印加した洗浄体を噴射させ、水管部外表面を洗浄する水管ボイラ内の堆積物除去方法であって、ドライアイスと圧縮空気とを混合する洗浄機本体と、前記洗浄機本体で製造したドライアイスと圧縮空気との混合気体である洗浄体を延長管ならびに噴射ノズルによって水管部外表面に吹き付けるノズル部とで構成し、水管部外表面に付着した堆積物を剥離する。

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