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Nagai, Yuya; Yoshida, Masato
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no abstracts in English
Yoshida, Masato; Tsubota, Yoichi; Aita, Takahiro
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no abstracts in English
Goto, Kenta
no journal, ,
In the dismantling of gloveboxes, workers wear air-fed suits and perform heavy work, therefore it is important to manage the physical condition of the workers during their work. We aimed to establish a physical condition management method to prevent problems caused by workers' physical conditions. Using the wearable device, the skin temperature and pulse rate data were continuously measured during workers' work, and the relationship between the acquired data and changes in workers' physical conditions was analyzed. The analysis results suggest that the risk of physical health problems increases, both when the rate of temperature increase in skin temperature is high during the first few tens of minutes of work and when the pulse rate remains outside the normal range of variation for a long time.
Suzuki, Ryuta; Yoshioka, Hikaru; Tamura, Ken
no journal, ,
no abstracts in English
Asakawa, Jun; Shibanuma, Tomohiro
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no abstracts in English
Aoya, Juri; Kono, Soma; Yamamoto, Masahiko; Inada, Satoshi; Kuno, Takehiko
no journal, ,
Vitrification of high active liquid waste (HALW) is a top priority toward the decommissioning of Tokai Reprocessing Plant. Concentration of Sodium (Na) in HALW is required to be analyzed accurately and quickly for the vitrification process control, because it affects viscosity of molten glass and element leaching rate from the vitrified waste. An inductively coupled plasma optical emission spectrometer (ICP-OES), which is modified for remote operation by manipulator in the hot cell, is used for determination of Na in HALW. However, the trouble of the ICP-OES generally requires long recovery time and causes possibility of the vitrification process delay. Therefore, for alternative determination method to prevent the vitrification process delay, Na determination method in HALW using Na-ion selective electrode, which measures electromotive force generated in accordance with ion concentration in solution sample is developed. In this study, influences by hydrogen ion (H
) and the other coexistent elements on analytical performance, and measurement results of Na in HALW by the ion selective electrode are reported.
Taniguchi, Takumi
no journal, ,
no abstracts in English
Honda, Fumiya; Isozaki, Kohei; Nabatame, Satoru
no journal, ,
no abstracts in English
Iwata, Hajime
no journal, ,
no abstracts in English
Hiraki, Yoshihisa
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no abstracts in English
Sakuma, Shuhei; Watanabe, Yuki; Kuroe, Ayame; Takimoto, Misaki; Takashima, Hideki; Takada, Chie; Tsujimura, Norio
no journal, ,
no abstracts in English
Nemoto, Shuji
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no abstracts in English
Omori, Kohei; Shibata, Atsuhiro; Yano, Kimihiko; Sato, Daisuke
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no abstracts in English
Takahashi, Yuta
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no abstracts in English
Kimura, Shuya; Shibata, Atsuhiro; Yano, Kimihiko
no journal, ,
no abstracts in English
Uchiyama, Rei; Yamada, Ryohei
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no abstracts in English
Sakakibara, Hiroshi; Aoki, Nobuhiro; Muto, Masahiro; Otabe, Jun; Takahashi, Kenji*; Fujita, Naoyuki*; Hiyama, Kazuhiko*; Suzuki, Hirokazu*; Kamogawa, Toshiyuki*; Yokosuka, Toru*; et al.
no journal, ,
no abstracts in English
-particle detector designed for monitoring of airborne dust with high radioactivityFujisawa, Makoto; Sagawa, Naoki; Hosomi, Kenji; Morishita, Yuki; Takada, Chie
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no abstracts in English
Matsushita, Kentaro; Ezure, Toshiki; Imai, Yasutomo*; Fujisaki, Tatsuya*; Tanaka, Masaaki
no journal, ,
In safety design of sodium-cooled fast reactor, generation of a cover gas entrainment vortex at free surface in upper plenum is an issue. It is necessary to evaluate gas entrainment vortex by numerical analysis, and gas entrainment amount evaluation tool "Stream Viewer" based on velocity distribution obtained by numerical analysis is developed. In this report, as a part of the development of Stream Viewer, evaluation method to identify vortex center line from free surface is examined to evaluate three dimensional behavior of gas entrainment vortex. The evaluation method was applied to an open channel water test in which an wake vortex is generated unsteadily from the plate. It was confirmed that vortex center line can be identified and a vortex that propagates to downstream and gas core grows can be distinguished from a vortex in which gas core does not grow by evaluation method of the vortex center line.
Kikuchi, Norihiro
no journal, ,
In the design study of a sodium-cooled fast reactor (SFR) in JAEA, the adoption of a fuel assembly (FA) with an inner duct structure called FAIDUS has been investigated to enhance safety of SFR. Due to the asymmetric layout of fuel rods by addition of the inner duct, the velocity and temperature distributions in FAIDUS may differ from that in typical FA. It is need to confirmed that applicability of the subchannel analysis code named ASFRE which has been developed as a FA design tool, to thermal hydraulics analysis in FAIDUS. Because the reference data on the thermal hydraulics in FAIDUS have not been obtained by the mock-up experiment, the code-to-code comparisons with numerical results of ASFRE and those of a CFD code named SPIRAL was conducted. The applicability of ASFRE was indicated through the confirmation of the consistency of mechanism of the specific temperature and velocity distributions occurring around the inner duct between the numerical results by ASFRE and SPIRAL.