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gas emissionTayama, Hidekazu; Nakanoya, Takamitsu; Otokawa, Yoshinori; Tsukihashi, Yoshihiro; Seki, Nobuo*; Onodera, Teruo*; Nisugi, Hikaru*
JAEA-Technology 2010-023, 42 Pages, 2010/09
JAEA-Technology-2010-023.pdf:4.81MB
The high-pressure gas facility for the tandem accelerator at nuclear science research institute is the facility to transfer SF gas between the accelerator and gas storage tanks. The SF gas is used to keep high voltage insulation of the tandem accelerator. This facility is one of the largest SF gas handling facilities in research laboratories. This facility has been operated for 31 years. In addition to regular maintenance, we have evaluated the deterioration due to aging. SF gas is regarded as a kind of green house gases that causes global warming and it is strongly required to reduce such gas emission into the atmosphere in recent years. In JAEA, the reduction of gas the emission is also an important problem. We have been continuously taking action for reducing the emission of SF gas. In this article, we report the records of maintenance, evaluation of aging, and activity of reducing SF gas emission.
Iida, Hiromasa; Kawasaki, Nobuo*; Konno, Chikara; Sato, Satoshi; Seki, Akiyuki
JAEA-Research 2008-050, 26 Pages, 2008/04
JAEA-Research-2008-050.pdf:1.98MB
An inconvenient experience was encountered, in which we have different answers depending on applied weight window values, in the nuclear analysis of the benchmark problem for CAD/MCNP interface programs, being developed under the ITER R&D task. Biasing can enhance calculation speed, but should not give different answers. Mechanism of this large underestimation is clarified. It is caused by the combination of the following two facts; (1) When one of particles in a history has got lost, MCNP cancels all tallies calculated during the history and all banked particles are thrown away (never tracked). (2) When we have distributed micro geometry errors in input data, important histories, which give significant contribution to tallies, will have many splitting and have "lost particle" with higher probability in the case of hard biasing. These two facts lead to selective canceling of important histories. An attempt to eliminate this inconvenience has been made, by modifying the subroutine "hstory" of MCNP. The modification has been done very successfully and eliminated the large underestimation, giving the same answer independently from applied weight window values.
Miura, Yukitoshi; ; ; Hoshino, Katsumichi; ; ; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; Maeda, M.*; et al.
Fusion Energy 1996, p.167 - 175, 1997/05
no abstracts in English
; ; ; ; ; ; ; Oikawa, Toshihiro; ; ; et al.
Fusion Energy 1996, p.885 - 890, 1997/05
no abstracts in English
Iida, Hiromasa; Kawasaki, Nobuo*; Konno, Chikara; Sato, Satoshi; Seki, Akiyuki
no journal, ,
no abstracts in English
Kawano, Katsumi; Hamada, Kazuya; Takano, Katsutoshi; Tsutsumi, Fumiaki; Nakajima, Hideo; Okuno, Kiyoshi; Seki, Shuichi*; Tokoro, Nobuo*; Shibanuma, Hideo*
no journal, ,
no abstracts in English
Ohara, Takashi; Kurihara, Kazuo; Nakatani, Takeshi; Suzuki, Jiro*; Otomo, Toshiya*; Hosoya, Takaaki*; Kusaka, Katsuhiro*; Tanaka, Ichiro*; Niimura, Nobuo*; Seki, Akiyuki; et al.
no journal, ,
no abstracts in English
Ohara, Takashi; Kusaka, Katsuhiro*; Hosoya, Takaaki*; Kurihara, Kazuo; Niimura, Nobuo*; Tanaka, Ichiro*; Suzuki, Jiro*; Nakatani, Takeshi; Otomo, Toshiya*; Seki, Akiyuki; et al.
no journal, ,
no abstracts in English