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Kato, Jun; Nakagawa, Akinori; Taniguchi, Takumi; Sakakibara, Tetsuro; Nakazawa, Osamu; Meguro, Yoshihiro
JAEA-Review 2017-015, 173 Pages, 2017/07
JAEA-Review-2017-015.pdf:6.67MB
Various radioactive wastes have been generated at the Fukushima Daiichi Nuclear Power Station (1F). To dispose of the wastes underground, it is necessary to make a suitable waste package by the volume reduction and solidification of the wastes. To plan the future decommissioning of 1F, it is also necessary to estimate feasibility of existing treatment technology for those wastes. Therefore the document survey has been performed about volume reduction and solidification technologies that have domestic or foreign experiences of practical treatment for radioactive wastes to assist selection of suitable treatment of the wastes. This report shows the arranged results. The 1F wastes are classified into two groups, homogeneous particulate and liquid wastes and heterogeneous solid wastes. The needful items for the feasibility study such as a technology name, a fundamental principle, treatment efficiency, and characteristic of solidified waste are summarized in each group.
Jo, Takahisa; Goto, Takehiro; Yabuki, Kentaro; Ikegami, Kazunori; Miyagawa, Takayuki; Mori, Tetsuya; Kubo, Atsuhiko; Kitano, Akihiro; Nakagawa, Hiroki; Kawamura, Yoshiaki; et al.
JAEA-Technology 2010-052, 84 Pages, 2011/03
JAEA-Technology-2010-052.pdf:17.14MB
The prototype fast breeder reactor MONJU resumed the System Startup Test (SST) on May 6th 2010 after five months and fourteen years shutdown since the sodium leakage of the secondary heat transport system on December 1995. Core Confirmation Test (CCT) is the first step of SST, which consists of three steps. CCT was finished on July 22nd after 78 days tests. CCT is composed 20 test items including control rods' worth evaluation, radiation dose measurement etc..
Toyoshima, Yoshiyuki*; Tanaka, Hisaki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 84, 2008/11
no abstracts in English
Toyoshima, Yoshiyuki*; Tanaka, Hisaki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
Hoshasen To Sangyo, (119), p.22 - 26, 2008/09
no abstracts in English
Toyoshima, Yoshiyuki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 93, 2008/03
no abstracts in English
Shioya, Satoshi; Nakagawa, Takahiro; Yamazaki, Takumi; Tachihara, Joji; Shuji, Yoshiyuki; Kikuno, Hiroshi
no journal, ,
In order to reduce the workload and improve the safety (i.e., prevention of internal exposure) of workers at Plutonium handling facilities, etc., JAEA has introduced a new Powered Air Purifying Respirator (PAPR) full-face mask as respiratory protective equipment. In introducing this mask, we conducted a leakage test in correspondence with Japanese Industrial Standards (JIS). In the leakage test, an examinee person wearing the mask entered an airlock and performed a prescribed action (e.g., stepping up and down on a stepladder, etc.) while the number concentration of NaCl test particles in/out of the mask was measured. Leakage rates were calculated for the results of 10 examinees. The test results showed that the leakage rate of this mask was 
0.01% (corresponding to the protection factor of 
10000) even when the electric fan was stopped, confirming that the mask remained high protection capability.
using ion beamsToyoshima, Yoshiyuki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Ura, Tetsuji*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
no journal, ,
no abstracts in English
Tanaka, Hisaki*; Toyoshima, Yoshiyuki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Ura, Tetsuji*; Iwashita, Kazuhiro*; Mikami, Shigeaki*; Sato, Katsuya; Narumi, Issei
no journal, ,
no abstracts in English
Toyoshima, Yoshiyuki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
no journal, ,
no abstracts in English
Yamazaki, Takumi; Takada, Chie; Nakagawa, Takahiro; Ishikawa, Hisashi
no journal, ,
no abstracts in English
Nakagawa, Takahiro; Takada, Chie; Yamazaki, Takumi; Momose, Takumaro
no journal, ,
no abstracts in English
-ray field with low dose rateKojima, Naomi; Nakagawa, Takahiro; Yamazaki, Takumi; Takimoto, Misaki; Takada, Chie
no journal, ,
In late years, Electronic Personal Dosemeter (EPD) has been widely used because of its useful specifications: indicating measurement values on site, lower detect limits than glass badge. However, an investigation of its response characteristic is difficult to perform using actual low dose rate -ray. The investigation needs sheildings of a entire irradiation room for reducing natural radiation. In this study, at the compact irradiation system with low dose rate which National Institute of Advanced Industrial Science and technology developed, -ray of 
Cs below 0.1
Sv/h were irradiated to two models of EPD with recording function. Integrated dose and standard deviation for EPD were analyzed to investigate response characteristics for low dose rate radiation.
Kato, Tatsuki; Hirato, Misaki; Matsuo, Kazuki; Takahashi, Akina; Tamura, Ken; Nagaoka, Mika; Yamazaki, Takumi; Nakagawa, Takahiro
no journal, ,
no abstracts in English
Inada, Takumi; Takiya, Hiroaki; Nakagawa, Akinori; Murokawa, Toshihiro; Okamura, Nobuo
no journal, ,
We have developed the simplified decommissioning cost estimation code for nuclear facilities (DECOST) to calculate the decommissioning costs of nuclear fuel facilities, excluding power reactors. As the decommissioning plans of JAEA become more concrete, there is a need for a system that can calculate decommissioning costs with higher accuracy than the aforementioned system, and efforts are being made to develop a system using bottom-up evaluation method. The bottom-up evaluation system is a system that accumulates the labor hours at the level of dismantling equipment and calculates the decommissioning cost per room or per decommissioning work contract. In this presentation, we will provide an overview of the system and introduce the results of an evaluation of decommissioning costs for some of the JAEA's decommissioning facilities.
genes using ion beamsToyoshima, Yoshiyuki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Sato, Katsuya; Hase, Yoshihiro; Narumi, Issei
no journal, ,
no abstracts in English
Toyoshima, Yoshiyuki*; Tanaka, Hisaki*; Akagawa, Takumi*; Yamazaki, Tatsuo*; Iwashita, Kazuhiro*; Mikami, Shigeaki*; Sato, Katsuya; Narumi, Issei
no journal, ,
no abstracts in English
Kato, Tatsuki; Hirato, Misaki; Matsuo, Kazuki; Takahashi, Akina; Tamura, Ken; Nagaoka, Mika; Yamazaki, Takumi; Nakagawa, Takahiro
no journal, ,
no abstracts in English
Nakagawa, Takahiro; Takada, Chie; Tsujimura, Norio; Yamazaki, Takumi; Kashimura, Shinya*
no journal, ,
no abstracts in English
Takada, Chie; Nakagawa, Takahiro; Yamazaki, Takumi; Ishikawa, Hisashi; Momose, Takumaro
no journal, ,
A special monitoring was performed for the persons working at Central Building in Tokai Reprocessing Plant in September, 2013. One person of the monitored subjects was estimated that he took a tiny amount of radioactive materials accidentally.
Takimoto, Misaki; Takada, Chie; Nakagawa, Takahiro; Yamazaki, Takumi; Ishikawa, Hisashi; Momose, Takumaro
no journal, ,
no abstracts in English
raysYamazaki, Takumi; Takada, Chie; Nakamura, Keisuke; Sagawa, Naoki; Hoshi, Katsuya; Nakagawa, Takahiro; Takimoto, Misaki; Tanimura, Yoshihiko*; Takahashi, Fumiaki; Momose, Takumaro; et al.
no journal, ,
no abstracts in English
