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Terunuma, Akihiro; Naito, Akira; Nemoto, Koichi; Usami, Jun; Tomii, Hiroyuki; Shiraishi, Kunio; Ito, Shinichi
JAEA-Review 2010-038, 96 Pages, 2010/09
JAEA-Review-2010-038.pdf:5.9MB
Japan Atomic Energy Agency (JAEA) has midterm plan for decommissioning the facilities being finished their role and the facilities that became unnecessary by shifting their functions to other facilities. In the first midterm plan (from the latter half of fiscal year 2005 to fiscal year 2009), decommissioning of five facilities (Ceramic Research Facility, Plutonium Research Facility No.2, Metallurgy Research Facility, Isotope Separation Research Facility and Reprocessing Test Facility) had been carried out in order to release controlled area and dismantle the facilities in Nuclear Science Research Institute (NSRI), JAEA. The decommissioning activity for each facility had been reported to the regulatory body and municipalities. On this report, we summarize the each activity for five facilities by reviewing the reports to the regulatory body and municipalities. We also added the knowledge obtained through the activity.
Satomi, Shinichi; Kanayama, Fumihiko; Hagiya, Kazuaki; Myodo, Masato; Kobayashi, Tadayoshi; Tomii, Hiroyuki; Tachibana, Mitsuo
JAEA-Technology 2008-067, 53 Pages, 2008/10
JAEA-Technology-2008-067.pdf:8.66MB
Dismantling activities of equipments in JAERI's Reprocessing Test Facility (JRTF) started from 1996 as a part of decommissioning of this facility. The large liquid waste storage tank LV-2 is scheduled to remove out as a whole tank without cutting in pieces from the annex building B to confirm safety and efficiency of this method from 2006. Before removal of the LV-2 tank, some preparatory works were carried out such as opening of concrete wall (LV-2 room) for the entrance of workers and materials, removal of pipes connected to the LV-2 tank, and decontamination of radioactive sludge in the LV-2 tank. Useful data were collected on manpower, radiation control and waste amount through the preparatory works, and work efficiency was analyzed by use of these data. It was compared manpower between core boring and hand-breaker crushing activities in the concrete wall opening work. It was also confirmed that local exposure of worker could be reduced in large extent by an addition of vinyl chloride cover on worker's ventilated suit.
Tachibana, Mitsuo; Shiraishi, Kunio; Ishigami, Tsutomu; Tomii, Hiroyuki
JAEA-Technology 2008-005, 33 Pages, 2008/03
JAEA-Technology-2008-005.pdf:2.1MB
The PL measuring device was produced to apply to the clearance verification measurement and the radiation measurement for releasing controlled areas. The basic characteristic test and the actual test were confirmed using the PL measuring device. As a result of these tests, it was found that the evaluation value of radioactivity with the PL measuring device was accuracy equal with the existing measuring device. The PL measuring device has feature of the existing measuring device with a light weight and easy operability. The PL measuring device can correct the 
ray too. The PL measuring device is effective to the clearance verification measurement of concrete on buildings and the radiation measurement for releasing controlled areas.
Myodo, Masato; Kobayashi, Tadayoshi; Tomii, Hiroyuki
JAEA-Technology 2008-001, 46 Pages, 2008/03
JAEA-Technology-2008-001.pdf:19.05MB
Dry wire-saw technology was applied for removal of penetrating pipes in annex building B of JAEA's reprocessing test facility (JRTF) and concrete blocks with penetrating pipes were successfully removed. The concrete block was cracked by a silent demolition agent and was easily separated into concrete and pipes by the secondary crushing by use of a hand-breaker. Effectiveness of the dry wire-saw technology for removal of penetrating pipes was discussed and evaluated based on various work data obtained in the present activity. The use of silent demolition agent was found to be very effective for the secondary crushing of concrete blocks and its charging condition into concrete was established so as to give effective cracks for the secondary crushing. As a result of this activity, it was confirmed that the dry wire-saw technology coupled with use of a silent demolition agent was one of hopeful candidates to remove penetrating pipes safely and effectively in reprocessing facilities.
Shiraishi, Kunio; Tachibana, Mitsuo; Ishigami, Tsutomu; Tomii, Hiroyuki
JAEA-Technology 2007-057, 46 Pages, 2007/09
JAEA-Technology-2007-057.pdf:21.21MB
The method for evaluating efficiently decommissioning cost in a short time was made based on the features of various types of nuclear facilities where the feature of nuclear facilities was arranged. The evaluation method can calculate decommissioning cost using conversion factors corresponding to weight of components and structures of nuclear facilities, etc. The conversion factors were made based on the experience of the JPDR decommissioning projects in the Japan Atomic Energy Research Institute (JAERI) and of improvements of the reprocessing plant of the Japan Nuclear Cycle Development Institute (JNC). In this report, the decommissioning cost evaluation method of nuclear facilities that had been made before unification of JAERI and JNC was revaluated as a new decommissioning cost evaluation method to reasonably advance decommissioning plans of various nuclear facilities.
Kudo, Kenji; Kawatsuma, Shinji; Rindo, Hiroshi; Watabe, Kozo; Tomii, Hiroyuki; Shiraishi, Kunio; Yagi, Naoto; Fukushima, Tadashi; Zaitsu, Tomohisa
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 8 Pages, 2006/07
Japan Atomic Energy Research Institute (JAERI) played a leading role in basic research in the field of atomic energy research and development, while Japan Nuclear Cycle Development Institute (JNC) did a major role in FBR cycle development and high level waste disposal. Following the Government's decision in December 2001, JAERI and JNC was merged as of October 1st, 2005. The new organization, Japan Atomic Energy Agency (JAEA), is an institute for comprehensive R&D for atomic energy, and is the largest research and development institute among Governmental R&D organizations. Its missions are basic research on atomic energy, R&D for nuclear fuel cycle, decommissioning of own facilities and disposal of waste, contribution to safety and non-proliferation, etc. The JAEA owns a number of nuclear facilities: research reactors such as JRR-2 and Joyo, prototype reactors such as ATR "Fugen" and FBR "Monju", fuel cycle plants such as Uranium Enrichment Demonstration Plant at Ningyo-Toge, MOX fuel plants at Tokai, Reprocessing Plant at Tokai, and Hot Laboratories such as JRTF and FMF. As a part of preparation of the mergence, JNC and JAERI have jointly developed a comprehensive cost estimation method for decommissioning, based on decommissioning and refurbishing experiences of JAERI and JNC. This method involves more estimation parameters from typical decommissioning activities than before, so as to make it more reliable. JAERI and JNC have estimated the total cost for decommissioning by using this method, and concluded that the cost would be 600 billion yen (approx. 5 billion USD).
Tomii, Hiroyuki; Matsuo, Kiyoshi*; Shiraishi, Kunio; Kato, Rokuro; Watabe, Kozo; Higashiyama, Yutaka; Nagane, Satoru*; Hanawa, Yukimitsu*
JAERI-Tech 2005-017, 65 Pages, 2005/03
JAERI-Tech-2005-017.pdf:3.79MB
no abstracts in English
Tomii, Hiroyuki; Matsuo, Kiyoshi*; Shiraishi, Kunio; Watabe, Kozo; Saiki, Hideo*; Kawatsuma, Shinji*; Rindo, Hiroshi*; Zaitsu, Tomohisa*
Dekomisshoningu Giho, (31), p.11 - 20, 2005/03
no abstracts in English
Tomii, Hiroyuki*; Matsuo, Kiyoshi*; Shiraishi, Kunio*; Watabe, Kozo*; Saiki, Hideo; Kawatsuma, Shinji; Rindo, Hiroshi; Zaitsu, Tomohisa
Dekomisshoningu Giho, (31), p.11 - 20, 2005/03
Japanese Government decided that Japan Atomic Energy Research Institute ( JAERI ) and Japan Nuclear Cycle Development Institute ( JNC ) shall be consolidated to a New rganization as of October 2005, which organization would be an Institute for comprehensive research and development for atomic.Through the preparation for unification, JAERI and JNC have been developing the Decommissioning program for own facilities, estimating decommissioning cost and the amount of waste from the decommissioning, and developing Management Program. Planning the Decommissioning program, it is important to estimate decommissioning cost effectively, because JAERI and JNC retain about 230 nuclear facilities which are reactors, fuel cycle facilities and research facilities. Then the decommissioning cost estimation method has developed based on several dismantling and replacement experiences. This method has adopted more estimation fomulae for decommissioning various works than ever, so as to be more reliable. And decommissioning cost for the facilities has estimated under the common condition. This method would be improved, reflecting future nuclear facilities dismantling and replacement events.This paper shows the cost estimation method for nuclear facilities and cost evaluation result for about 230 facilities of both JAERI and JNC.
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Dekomisshoningu Giho, 0(15), p.24 - 34, 1996/12
no abstracts in English
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IRPA9: 1996 International Congress on Radiation Protection, Proceedings, 3, p.350 - 352, 1996/00
no abstracts in English
Miyasaka, Yasuhiko; ; Tanaka, Mitsugu; Nakamura, Hisashi; ; Tachibana, Mitsuo; ; Hatakeyama, Mutsuo; ; Yoshimori, Michiro; et al.
Nihon Genshiryoku Gakkai-Shi, 38(7), p.553 - 576, 1996/00
no abstracts in English
; ; Onodera, Junichi; ; Ikezawa, Yoshio
Proc. of the Int. Conf. on Radiation Effects and Protection, p.434 - 439, 1992/00
no abstracts in English
Matsui, Hiroshi; Ikezawa, Yoshio; ; ; Onodera, Junichi; ; ; Yoshida, Yoshikazu*
7th Int. Congress of the IRPA, Radiation Protection Practice, Vol. 2, p.673 - 676, 1988/00
no abstracts in English
Tachibana, Mitsuo; Myodo, Masato; Shiraishi, Kunio; Kanayama, Fumihiko; Kobayashi, Tadayoshi; Ishigami, Tsutomu; Tomii, Hiroyuki
no journal, ,
no abstracts in English
Kanayama, Fumihiko; Satomi, Shinichi; Myodo, Masato; Tomii, Hiroyuki; Tachibana, Mitsuo
no journal, ,
no abstracts in English
