Refine your search:     
Report No.
 - 
Search Results: Records 1-17 displayed on this page of 17
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Degassing behavior of noble gases from groundwater during groundwater sampling

Nakata, Kotaro*; Hasegawa, Takuma*; Solomon, D. K.*; Miyakawa, Kazuya; Tomioka, Yuichi*; Ota, Tomoko*; Matsumoto, Takuya*; Hama, Katsuhiro; Iwatsuki, Teruki; Ono, Masahiko*; et al.

Applied Geochemistry, 104, p.60 - 70, 2019/05

 Times Cited Count:0 Percentile:100(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Study on safety evaluation for nuclear fuel cycle facility under accident conditions

Abe, Hitoshi; Tashiro, Shinsuke; Morita, Yasuji

JAERI-Conf 2005-007, p.199 - 204, 2005/08

Source term data for estimating release behavior of radioactive nuclides is necessary to evaluate synthetic safety of nuclear fuel cycle facility under accident conditions, such as fire and criticality. In JAERI, the data has been obtained by performing some demonstration tests. In this paper, the data for the criticality accident in fuel solution obtained from the TRACY experiment, will be mainly reviewed. At 4.5 h after the transient criticality, the release ratio of the iodine were about 0.2% for re-insertion of transient rod at just after transient criticality and about 0.9% for not re-insertion. Similarly the release coefficient and release ratio for Xe were estimated. It was proved that the release ratio of Xe-141 from the solution was over 90% in case that the inverse period was over about 100 (1/s). Furthermore, outline of the study on the fire accident as future plan will be also mentioned.

Journal Articles

Study of plasma termination using high-Z noble gas puffing in the JT-60U tokamak

Bakhtiari, M.; Tamai, Hiroshi; Kawano, Yasunori; Kramer, G. J.*; Isayama, Akihiko; Nakano, Tomohide; Kamiya, Kensaku; Yoshino, Ryuji; Miura, Yukitoshi; Kusama, Yoshinori; et al.

Nuclear Fusion, 45(5), p.318 - 325, 2005/05

 Times Cited Count:39 Percentile:20.18(Physics, Fluids & Plasmas)

In the previous works we had shown that injecting a mixture of large amounts of hydrogen and small amounts of argon can terminate a tokamak discharge quickly with avoiding runaway electron generation. In this work we have done the same experiments but with different gases in addition to argon. In fact we compared the effect of the puffing of argon, krypton, and xenon gases with and without simultaneous hydrogen gas puffing on disruption mitigation. We observed that injecting all impurities in the form of an admixture in hydrogen lead to faster plasma shutdowns with less runaway electron generation. We also found that injecting krypton gas (with or without hydrogen) seems to be a good candidate for plasma shutdown purposes since it induces low heat flux to divertor plates and avoids runaway electron generation more effectively.

JAEA Reports

Development of evaluation method of fuel failure fraction during the high temperature engineering test reactor operation

Sawa, Kazuhiro; Yoshimuta, Shigeharu*; Tobita, Tsutomu*;

JAERI-Research 97-036, 23 Pages, 1997/05

JAERI-Research-97-036.pdf:0.72MB

no abstracts in English

JAEA Reports

Plate-out distribution of iodine in a high temperature gas cooling in-pile loop facility

Matsumoto, Mikio; Endo, Yasuichi; ; Itabashi, Yukio; ; Yokouchi, Iichiro; Ando, Hiroei

JAERI-M 92-212, 62 Pages, 1993/01

JAERI-M-92-212.pdf:2.09MB

no abstracts in English

Journal Articles

Verification of fission product release model from High Temperature Engineering Test Reactor fuel

Sawa, Kazuhiro; Shiozawa, Shusaku; Fukuda, Kosaku;

Journal of Nuclear Science and Technology, 29(9), p.842 - 850, 1992/09

no abstracts in English

Journal Articles

Release of short-lived noble gases from HTGR fuel with failed coated fuel particles and contaminated matrix

Ogawa, Toru; Kobayashi, Fumiaki; Tobita, Tsutomu; Fukuda, Kosaku; Saito, Takashi; Yokouchi, Iichiro;

Nucl. Eng. Des., 132, p.31 - 37, 1991/00

 Times Cited Count:10 Percentile:26.5

no abstracts in English

Journal Articles

Development of on emergency-use stack gas monitor

;

Nippon Genshiryoku Gakkai-Shi, 29(7), p.656 - 663, 1987/07

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

JAEA Reports

Estemation Method of Projected Dose for Emergency Monitoring

; Numakunai, Takao; ;

JAERI-M 8966, 50 Pages, 1980/07

JAERI-M-8966.pdf:4.17MB

no abstracts in English

Journal Articles

The Contribution of the double collision occurring in an atom to the yield of the ionization and excitations of noble gases irradiated by 100keV electrons

*; *; Ono, Shinichi

Bulletin of the Chemical Society of Japan, 48(5), p.1411 - 1416, 1975/05

 Times Cited Count:11

no abstracts in English

Oral presentation

SAUNA system upgrade for certification of the Takasaki IMS station

Tomita, Yutaka; Kumata, Masahiro; Wakabayashi, Shuji; Kijima, Yuichi; Yamamoto, Yoichi; Oda, Tetsuzo

no journal, , 

Oral presentation

High precision noble gas isotope measurement by NGX multi-collector noble gas mass spectrometer

Tamura, Hajimu; Kokubu, Yoko; Umeda, Koji

no journal, , 

JAEA installed an IsotopX NGX noble gas mass spectrometer with an water sample oriented preparation system in Tono Geoscience Center to measure helium accumulation age and neon isotope ratio of ground water for estimation of ground water stability on long term geological stability survay on geological disposal of nuclear waste. High precision isotope analysis by multi-collector mass spectrometer is neccessary tool for neon isotope analysis of young ground water due to small isotopic variation of neon for nucleogenic reaction or mixing of volcanic fluids in ground water. NGX-004 was configured for simultanous measurement of neon isotopes with 2 faradays for $$^{20}$$Ne and $$^{22}$$Ne, and 1 SEM for $$^{21}$$Ne spaced out 1 m/z each other. 10.084 $$pm$$ 0.002 of $$^{20}$$Ne/$$^{22}$$Ne and 0.02598 $$pm$$ 0.00004 of $$^{21}$$Ne/$$^{22}$$Ne were obtained by $$10^{11}$$ ohm faraday and $$10^{12}$$ ohm faraday, and ion count and $$10^{12}$$ ohm faraday, which is able to resolve 0.2% difference.

Oral presentation

JAEA's recent activities related to CTBT verification regime

Yamamoto, Yoichi; Kijima, Yuichi; Tomita, Yutaka

no journal, , 

This presentation summarizes JAEA's recent activities related to CTBT verification regime. To establish the global verification regime of CTBT for the nuclear tests, JAEA has been operating provisionally three facilities (two monitoring stations and one radionuclide laboratory) of the CTBT international monitoring system and a national data center for radionuclide monitoring. For the 6th nuclear test conducted by North Korea in September 2017, JAEA reported the analysis and evaluation results of data observed at the CTBT radionuclide monitoring stations to the national government etc. in a timely manner and thereby contributed to the evaluation by the national government based on the CTBT operation system in Japan. For the purpose of strengthening CTBTO's detection capability for nuclear tests, JAEA started new noble gas joint measurement project with CTBTO in Horonobe (Hokkaido) and Mutsu (Aomori) based on the Japanese government contribution in 2017.

Oral presentation

Status report on Japanese NDC-2; current status of Xenon joint measurement project at Horonobe and Mutsu

Yamamoto, Yoichi; Kijima, Yuichi; Tomita, Yutaka

no journal, , 

Based on repeated DPRK's nuclear tests, the Japanese government contributed funds for the noble gas measurement project in February 2017 for the purpose of strengthening CTBTO's detection capability for nuclear tests. The CTBTO decided to conduct measurements in Hokkaido and Tohoku regions of Japan for the time being, and to enhance JAEA with experiences and performance of measurements in Japan as the responsible organization. In response to this, the JAEA has installed two mobile noble gas measurement systems at Horonobe, Hokkaido and JAEA Ohminato site in Mutsu, Aomori, and been carrying out the joint measurement project with the CTBTO. The current status of this project will be presented.

Oral presentation

Importance of noble gas monitoring in CTBT verification technology and observation results in Takasaki radionuclide monitoring station

Yamamoto, Yoichi; Kijima, Yuichi; Tomita, Yutaka

no journal, , 

Radionuclide monitoring is the only way to judge whether the target explosion event was a nuclear test. Among the radionuclides produced by the nuclear explosion, the noble gases are particularly important because they are inert and more likely to leak to the ground rather than other substances in an underground nuclear test. Only 4 radioxenon isotopes as the noble gases are monitored for the CTBT verification. It was after the first nuclear test of North Korea in October 2006, when a radioxenon monitoring system installed at the Takasaki radionuclide monitoring station in Japan and the radioxenon monitoring has been carried out since January 2007. We report on the past observation results of the radioxenon at the Takasaki radionuclide monitoring station and the characteristics of radioxenon background.

17 (Records 1-17 displayed on this page)
  • 1