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Journal Articles

Target station design of 1 MW spallation neutron source at the high intensity proton accelerator facilities J-PARC

Takada, Hiroshi; Maekawa, Fujio; Honmura, Shiro*; Yoshida, Katsuhiko*; Teraoku, Takuji*; Meigo, Shinichiro; Sakai, Akio*; Kasugai, Yoshimi; Kanechika, Shuji*; Otake, Hidenori*; et al.

Proceedings of ICANS-XVI, Volume 3, p.1115 - 1125, 2003/07

no abstracts in English

JAEA Reports

Design of 1 MW spallation neutron source under the High-intensity Proton Accelerator Project; Design of helium vessel

Honmura, Shiro*; Teraoku, Takuji*; Yoshida, Katsuhiko*; Takada, Hiroshi; Maekawa, Fujio; Kasugai, Yoshimi; Hino, Ryutaro; Watanabe, Noboru; Furusaka, Michihiro

JAERI-Tech 2003-054, 62 Pages, 2003/06

JAERI-Tech-2003-054.pdf:9.53MB

The JAERI and the KEK are jointly on the way of constructing facilities under the High-Intensity Proton Accelerator Project (J-PARC). The Materials and Life Science Facility is one of major facilities comprising a 1MW pulsed neutron source (JSNS). The neutrons are to be utilized for advanced researches in fields of materials and life science, and so on. In designing helium-vessel, it is important to assure structural integrity of the helium-vessel against earthquakes. It is also important to manufacture accurately neutron view ports. In-vessel components need to be replaced by remote handling after a certain period of operation due to radiation damages. To make the replacement steadily and easily, the helium-vessel has to provide suitable support, positioning and sealing structures. This report describes bases and conditions for deigning the helium-vessel, and summarizes basic structural specifications of the helium-vessel which are determined with structure strength and temperature analyses.

Journal Articles

R&D of a MW-class solid-target for spallation neutron source

Kawai, Masayoshi*; Furusaka, Michihiro*; Kikuchi, Kenji; Kurishita, Hiroaki*; Watanabe, Ryuzo*; Li, J.*; Sugimoto, Katsuhisa*; Yamamura, Tsutomu*; Hiraoka, Yutaka*; Abe, Katsunori*; et al.

Journal of Nuclear Materials, 318, p.35 - 55, 2003/05

R&D works for MW class solid target composed of tungsten to produce pulsed intense neutron source has been made in order to construct a future scattering facility. Three methods were investigated to prevent corrosion of tungsten from water; those are hipping, brazing and electric coating in molten salt bath. Hipping condition was optimized to be 1500 degree C in the previous work: here small punch test shows highest load for crack initiation of hipped materials at the boundary of W/Ta. The basic techniques for the other two methods were developed. Erosion test showed that uncovered W is susceptible of flowing water velocity. At high velocity w is easy to be eroded. For solid target design slab type and rod type targets were studied. As long as the optimized neutron performance is concerned, 1MW solid target is better than mercury target.

JAEA Reports

The measurement test of uranium in a uranium-contaminated waste by passive gamma-rays measurement method

Sukegawa, Yasuhiro*; Suzuki, Satoshi*; Yoshida, Michihiro; Oki, Koichi;

JNC TN8440 2002-019, 91 Pages, 2002/11

JNC-TN8440-2002-019.pdf:15.13MB

This report is completed about the measurement test and the proofreading of passive $$gamma$$-rays measurement method for Non-destructive assay of uranium in a uranium-contaminated waste. The following are the results of the test. (1)The estimation of the amount of uranium by ionization survey meter is difficult for low intensity of $$gamma$$-rays emitted from uranium under about 50g. (2)The estimation of the amount of uranium in the waste by NaI detector is possible in case of only uranium, but the estimation from mixed spectrums with transmission source (60-cobalt) is difficult to confirm target peaks. (3)If daughter nuclides of uranium and thorium chain of uranium ore exist, measurement by NaI detector is affected by $$gamma$$-rays from the daughter nuclides seriously. As a result, the estimation of the amount of uranium is difficult. (4)The measurement of uranium in a uranium-contaminated waste by germanium detector is possible to estimate of uranium and other nuclides. (5)As to estimation of the amount of uranium, energy at 1,001keV emitted from 234m-protoactinium radiative equilibrium to 238-uranium had nothing to overlap with other nuclides peaks is effective. The following are the results of measurement precision and sensitivity by the proofreading of germanium detector system. (1)Measurement sensitivity about a 200L drum of Gamma System1(GS1) is 4 g/600sec about 238-uranium, and measurement precision is about $$pm$$50%. (2)Measurement sensitivity about a 200L drum of Gamma System2(GS2)is 2 g/600sec about 238-uranium, and measurement precision is about $$pm$$100%.

Journal Articles

None

Yoshida, Michihiro; Miyo, Hiroaki; ; Ishibashi, Yuzo;

Saikuru Kiko Giho, (10), p.43 - 49, 2001/03

None

JAEA Reports

Measures of closing report of outside waste storage pits separate volume part II; Data collections about measurement of contamination and measurement after decontamination in outside waste storage pits

; Sukegawa, Yasuhiro*; Suzuki, Satoshi*; Yoshida, Michihiro; ; *; Miyo, Hiroaki

JNC TN8440 2000-022, 180 Pages, 2000/10

JNC-TN8440-2000-022.pdf:12.16MB

At outside waste strage pits, containers for strage of wastes corroded and were flooded, and it was confirmed on August 26, 1997. Confirmation of contamination of the pits outskirts, installation of sheets to prevent rainwater from flowing into the pits, drawing stay water were executed, promptly. Design and authorization works of the work house and waste treatment devices to take out wastes of the pits were executed too. After construction of the work house, taking out wastes of the pits started, and finished on April 10, 1998. Investigations of the inflow point of rainwater and leak of stay water were executed next. The results were reported to Science and Technology Agency (STA), adjoining authorities on December 21, 1998. After decontamination of the pits inner walls to background level of the radioactivity which included general concrete, control area was removed, and the pits were closed by concrete. Measures of closing of the pits were prepared from the middle of August, 1999, and dismantlement of unnecessary instruments started. Decontamination of the pits started from the beginning of September, 1999. The above works finished on June 30, 2000. After decontamination of the pits, STA, adjoining authorities confirmed the dircumstances. Work pouring concrete into the pits was executed three times (three levels), and finished on August 31, 2000. In addition to above, the amount of concrete poured into the pits was about 1,200 m$$^{3}$$. These data compiled the inspection of contamination in measures of closing of the pits.

JAEA Reports

Measures of closing report of outside waste storage pits; Separate Volume Part I; Photographs sbout improvement step of outside waste storage pits

Yoshida, Michihiro; Suzuki, Satoshi*; Sukegawa, Yasuhiro*; Miyo, Hiroaki

JNC TN8440 2000-021, 180 Pages, 2000/10

JNC-TN8440-2000-021.pdf:42.37MB

At outside waste storage pits, containers for storage of wastes corroded and were flooded, and it was confirmed on August 26, 1997. Confirmation of contamination of the pits outskirts, installation of sheets to prevent rainwater from flowing into the pits, drawing stay water were executed, promptly. Design and authorization works of the work house and waste treatment devices to take out wastes of the pits were executed too. After construction of the work house, taking out wastes of the pits started, and finished on April 10, 1998. Investigations of the inflow point of rainwater and leak of stay water were executed next. The results were reported to Science and Thechnology Agency (STA), adjoining authorities on December 21, 1998. After decontamination of the pits inner walls to background level of the radioactivity which included general concrete, control area was removed, and the pits were closed by concrete. Measures of closing of the pits were prepared from the middle of August, 1999, and dismantlement of unnecessaly instruments started. Decontamination of the pits started fiom the beginning of September, 1999. The above works finished on June 30, 2000. After decontamination of the pits, STA, adjoining authorities confirmed the circumstances. Work pouring concrete into the pits was executed three times (three levels), and finished on August 31, 2000. In addition to above, the amount of concrete poured into the pits was about 1,200 m$$^{3}$$. This report compiled the photographs of the works from confirmation of stay water at August, 1997 by finish of measures of closing of the pits at September, 2000.

JAEA Reports

Measures of closing report of outside waste storage pits

; Ishibashi, Yuzo; Yoshida, Michihiro; Miyo, Hiroaki; Sukegawa, Yasuhiro*; *; Suzuki, Satoshi*

JNC TN8440 2000-020, 500 Pages, 2000/10

JNC-TN8440-2000-020.pdf:25.91MB

At outside waste storage pits, containers for storage of wastes corroded and were flooded, and it was confirmed on August 26, 1997. Confirmation of contamination of the pits outskirts, installation of sheets to prevent rainwater from flowing into the pits, drawing stay water were executed, promptly. Design and authorization works of the work house and waste treatment devices to take out wastes of the pits were executed too. After construction of the work house, taking out wastes of the pits started, and finished on April 10, 1998. Investigations of the inflow point of rainwater and leak of stay water were executed next. The results were reported to Science and Thechnology Agency (STA), adjoining authorities on December 21, 1998. After decontamination of the pits inner walls to background level of the radioactivity which included general concrete, control area was removed, and the pits were closed by concrete. Measures of closing of the pits were prepared from the middle of August, 1999, and dismantlement of unnecessary instruments started. Decontamination of the pits started from the begining of September, 1999. The above works finished on June 30, 2000. After decontamination of the pits, STA, adjoining authorities confirmed the circumstances. Work pouring concrete into the pits was executed three times (three levels), and finished on August 31, 2000. In addition t0 above, the amount of concrete poured into the pits was about 1,200 m$$^{3}$$.

JAEA Reports

None

; ; ; Yoshida, Michihiro; ;

JNC TN8440 99-027, 155 Pages, 1999/07

JNC-TN8440-99-027.pdf:12.59MB

None

JAEA Reports

None

Miyo, Hiroaki; Yoshida, Michihiro; *; Asami, Makoto*; Iso, Takahito*; *; *

PNC TN8440 96-010, 171 Pages, 1996/03

PNC-TN8440-96-010.pdf:9.98MB

None

JAEA Reports

None

; Koakutsu, Masayuki; *; Yoshida, Michihiro; ; *;

PNC TN8450 91-006, 77 Pages, 1991/03

PNC-TN8450-91-006.pdf:2.09MB

None

JAEA Reports

None

; Koakutsu, Masayuki; *; Yoshida, Michihiro; ; *;

PNC TN8450 91-005, 103 Pages, 1991/02

PNC-TN8450-91-005.pdf:2.7MB

None

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