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C discharge at RI facilities; A Comparison of collection and oxidation methodsUeno, Yumi; Koarashi, Jun; Iwai, Yasunori; Sato, Junya; Takahashi, Teruhiko; Sawahata, Katsunori; Sekita, Tsutomu; Kobayashi, Makoto; Tsunoda, Masahiko; Kikuchi, Masamitsu
Hoken Butsuri, 49(1), p.39 - 44, 2014/03
The Japan Atomic Energy Agency has conducted a monthly monitoring of airborne C discharge at the forth research building (RI facility) of the Tokai Research and Development Center. In the current monitoring, C, which exists in various chemical forms in airborne effluent, is converted into CO
with CuO catalyst and then collected using monoethanolamine (MEA) as CO absorbent. However, this collection method has some issues on safety management because the CuO catalyst requires a high heating temperature (600
C) to ensure a high oxidation efficiency and the MEA is specified as a poisonous and deleterious substance. To establish a safer, manageable and reliable method for monitoring airborne C discharge, we examined collection methods that use different CO absorbents (MEA and Carbo-Sorb E) and oxidation catalysts (CuO, Pt/Alumina and Pd/ZrO). The results showed 100% CO collection efficiency of MEA during a 30-day sampling period under the condition tested. In contrast, Carbo-Sorb E was found to be unsuitable for the monthly-long CO collection because of its high volatile nature. Among the oxidation catalysts, the Pd/ZrO showed the highest oxidation efficiency for CH
at a lower temperature.
Takehara, Kazuki*; Sasa, Yoichi; Sekita, Tsutomu
FAPIG, (173), p.21 - 29, 2006/07
no abstracts in English
Tachibana, Haruo; Kikuchi, Masamitsu; Sekita, Tsutomu; Yamaguchi, Takenori; Oeda, Mikihiro*; Kurosawa, Naohiro*
JAERI-Data/Code 2004-010, 19 Pages, 2004/06
JAERI-Data-Code-2004-010.pdf:1.92MB
JAERI-Data-Code-2004-010-appendix(CD-ROM).zip:12.12MB
This report is a revised edition of "Isopleths of Surface Air Concentration and Surface Air Absorbed Dose Rate due to a Radioactive Cloud Released from a Stack(II)"(JAERI-M 90-206) and based on the revised Nuclear Safety Guidelines reflected the ICRP1990 Recommendation. Characteristics of this report are the use of Air Karma Rate (Gy/h) unit instead of Air Absorbed Dose Rate (Gy/h) unit, and the records of isopleths of surface air concentration and surface air karma rate on CD-ROM. These recorded data on CD-ROM can be printed out on paper and/or pasted on digital map by personal computer.
Sekita, Tsutomu; Tachibana, Haruo; Matsuura, Kenichi; Yamaguchi, Takenori
JAERI-Data/Code 2003-017, 106 Pages, 2003/12
JAERI-Data-Code-2003-017.pdf:5.32MB
The meteorological observation data at Tokai site were analyzed statistically based on a "Guideline of meteorological statistics for the safety analysis of nuclear power reactor" (Nuclear Safety Commission on January 28,1982; revised on March 29, 2001). This report shows the meteorological analysis of wind direction, wind velocity and atmospheric stability etc. to assess the public dose around the Tokai site caused by the released gaseous radioactivity. The statistical period of meteorological data is every 5 years from 1981 to 1995.
Tachibana, Haruo; Sekita, Tsutomu; Yamaguchi, Takenori
Radioisotopes, 52(8), p.383 - 388, 2003/08
The national and local governments, and the nuclear enterprises have strengthened nuclear disaster measures since the JCO criticality accident in 1999. This report shows the renewed radiation monitoring equipment and extended system for functional strengthening of the environmental radiation observation in Tokai site of JAERI.
Tachibana, Haruo; Sekita, Tsutomu; Yamaguchi, Takenori
JAERI-Data/Code 2003-002, 46 Pages, 2003/03
JAERI-Data-Code-2003-002.pdf:4.49MB
A computer code (W-View) was developed to analyze the meteorological data statistically based on “the guideline of meteorological statistics for the safety analysis of nuclear power reactor"(Nuclear Safety Commission on January 28,1982; revised on March 29,2001), which code is used for statistical analysis of meteorological data to assess the public dose in case of normal operation and severe accident to get the license of nuclear reactor operation. This code was revised from large office computer code and developed for personal computer user to analyze the meteorological data simply and conveniently and to make the statistical data tables and figures of meteorology.
Sawa, Kazuhiro; Tobita, Tsutomu*; Ueta, Shohei; Suzuki, Shuichi*; Sumita, Junya; Sekita, Kenji; Aoki, Kazunori*; Ouchi, Hiroshi
JAERI-Research 2001-002, 33 Pages, 2001/02
JAERI-Research-2001-002.pdf:1.42MB
no abstracts in English
Kobayashi, Toshiaki; Kawamatsu, Yorimitsu; Yamasoto, Kotaro; Yamada, Katsunori; Sekita, Tsutomu; Kabuto, Masayuki
no journal, ,
no abstracts in English
Sekita, Tsutomu; Kobayashi, Toshiaki; Hiraga, Hayato; Yasuda, Takayuki; Kikuchi, Masamitsu; Tsunoda, Masahiko
no journal, ,
no abstracts in English
Kawasaki, Takayuki; Sekita, Tsutomu; Kikuchi, Masamitsu; Tsunoda, Masahiko
no journal, ,
no abstracts in English
