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Shibahara, Yuji; Usui, Hideo; Izumo, Sari; Izumi, Masanori; Tezuka, Masashi; Morishita, Yoshitsugu; Kiyota, Shiko; Tachibana, Mitsuo
Nihon Genshiryoku Gakkai Wabun Rombunshi, 12(3), p.197 - 210, 2013/09
As the first step of the applicability inspection of PRODIA Code for dismantling activities in the decommissioning of FUGEN, manpower needs for dismantling activities in FUGEN conducted in 2008 were calculated with conventional calculation formulas which were made by data obtained from JPDR decommissioning program. Since the conventional calculation formula for dismantling of feedwater heater has no applicability, the new calculation formula was constructed by reflecting the work description of dismantling of feedwater heater in FUGEN. It was found that the calculation results with this new formula showed the good agreement with the actual data both of 3rd feedwater heater and 4th one. Based on this discussion, some case studies for dismantling of feedwater heater were conducted.
Kutsuna, Hideki; Matsumori, Akira*; Izumi, Masanori; Hayashi, Hirokazu; Higashiura, Norikazu
JAEA-Review 2011-025, 43 Pages, 2011/07
JAEA-Review-2011-025.pdf:2.84MB
In planning and carrying out our decommissioning technical development, "Technical special committee on Fugen decommissioning", which consists of the members well-informed, is established, aiming to make good use of Fugen as a place for technological development which is opened inside and outside the country, as the central point in the energy research and development base making project of Fukui prefecture, and to utilize the outcome in our decommissioning to the technical development effectively. This report compiles presentation materials "Current Situation of Fugen Decommissioning", "Radioactive Corrosion Products (CP) Decontamination Experiment with Heavy Water System Equipment", "Application of management data evaluation system to Fugen", "Preparatory Situation for Operation of Clearance System" of the 22nd Technical special committee on Fugen decommissioning which held on September 14, 2010.
Shibahara, Yuji; Tachibana, Mitsuo; Izumi, Masanori; Nanko, Takashi
JAEA-Technology 2011-010, 44 Pages, 2011/06
JAEA-Technology-2011-010.pdf:2.43MB
Manpower needs for the preparation and clean-up process on the dismantling of equipments in FUGEN 3rd/4th feedwater heater room conducted in 2008 was calculated with the management data evaluation system: PRODIA Code, and it was inspected whether the conventional evaluation model had the applicability for large nuclear facilities such as FUGEN or not. It was confirmed that the conventional evaluation model had no applicability for FUGEN causing by the difference in the plant scale between JPDR and FUGEN bringing the expanding of working area. The difference between the actual data and the calculated value was improved by the reviewing of the evaluation model, and this reviewing process also brought the new evaluation model.
Shibahara, Yuji; Tachibana, Mitsuo; Ishigami, Tsutomu; Izumi, Masanori; Nanko, Takashi
JAEA-Technology 2010-033, 42 Pages, 2010/10
JAEA-Technology-2010-033.pdf:1.02MB
Manpower needs for the dismantling process in FUGEN 3rd/4th feedwater heater room was calculated with the evaluation system (PRODIA Code), and it was inspected whether the conventional evaluation model had applicability for FUGEN or not. It was confirmed that the conventional evaluation model for feedwater heater had no applicability. In comparison of the calculated value with the actual data, we found two difference: (1) the evaluated manpower were significantly larger than the actual data, (2) the manpower need for the dismantling of 3rd feedwater heater was twice larger than that of 4th feedwater heater, though these equipments were almost same weight. It was found that these were brought (1) by the difference in the work descriptions of dismantling between JPDR and FUGEN, and (2) by that in the cutting number between 3rd feedwater heater and 4th one. The manpower needs for the dismantling of both feedwater heaters were calculated with a new calculation equation reflecting the descriptions of dismantling, and it was found that these results showed the good agreement with the actual data.
Shibahara, Yuji; Izumi, Masanori; Nanko, Takashi; Tachibana, Mitsuo; Ishigami, Tsutomu
Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.347 - 353, 2010/10
Bian, Z.*; Ishii, Hirotake*; Shimoda, Hiroshi*; Yoshikawa, Hidekazu*; Morishita, Yoshitsugu; Kanehira, Yoshiki; Izumi, Masanori
IEICE Transactions on Information and Systems, E90-D(6), p.963 - 974, 2007/06
Times Cited Count：4 Percentile：33.28(Computer Science, Information Systems)This study designed linecode marker, a new type of paper-based marker and proposed recognition, tracking algorithm for it in order to resolve these problems. In comparison of the conventional paper-based markers, such as square markers, circle markers, the linecode marker is not only just easier to set up in complex industrial environment, but also makes it possible to use AR in industrial plant. In order to evaluate the tracking accuracy, trackable distance of the proposed tracking method, an evaluation experiment was conducted in a large room. The experiment results show that: comparing with traditional marker-based tracking method, tracking possible distance extends extremely; tracking accuracy improved to a level of 20cm in 10m distance.
Izumi, Masanori
Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13) (CD-ROM), P. 353, 2005/05
Fugen have been developing Decommissioning Engineering Support system (DEXUS)aimed at planning optimal dismantlement process and carrying out dismantlement work safely and correctly. DEXUS consists of "Decommissioning Plan Support System" and "Dismantlement Support system". We reported about the former sysyem, so we intend to report about the latter system. The main object of dismantlement support system is to ensure safety for wokers collectdismantlement result data and manage genrated wastes during the actual dismatlement works. Now we are develpoing three subsystems such as "Worksite visualization system", "Collecting dismantlement resultsystem" and "Management generated Waste system".
Iguchi, Yukihiro; Knehira, Yoshiki; Izumi, Masanori; Fujita, Toru*; Oya, Kiyomi*
JNC TN3520 2004-001, 172 Pages, 2004/03
JNC-TN3520-2004-001.pdf:11.04MB
In the VRdose R5 version the connection with the dynamic radiation evaluation system (DRES) was the main task. DRES can calculate the dose rate field of the Fugen plant in detail. By inserting special markers into the scenario, VRdose tells DRES what changes have been made to the model. The changes are about objects that are inserted, removed, cut or moved. DRES will then calculate new dose rate fields reflecting these changes. To minimize the calculation needed for DRES, VRdose can provide a volume enclosing only the area of interest for a given scenario and give the resolution of the calculation in all axes. In addition to the DRES connection, version R5 retrieves information about the objects in the model from the Fugen object database. Among the large amount of information available, are size, weight and surface contamination of co-60 used. The wizard uses the size and weight information in the calculation of the man-work required. The surface contamination is used in a new feature that colorizes the objects after the contamination value. This makes it easier for workers to become aware of the contamination of pipes and pumps etc. R5 has been internationalized on all menus, buttons, messages and other text. VRdose can therefore be translated into any desired language. A feasibility study has been made into using Japanese characters in names and properties in the scenario. Printing of the 3D view has been implemented, which is useful for documenting. The scenario can also be printed, both as a graphical representation and in a textual report format. Other functionality that can be mentioned is output from the wizard to Cosmard and the saving of viewpoints. The manikins wear different protection masks and in version R5 the efficiency of the protection can be changed for each nuclide. Several other minor changes have been made, such as the ability to switch between extern dose and nuclide intake in the dose graph panels.
Bian, Z.*; Ishii, Hirotake*; Izumi, Masanori
no journal, ,
This study designed linecode marker, a new type of paper-based marker and proposed recognition, tracking algorithm for it in order to resolve these problems. In comparison of the conventional paper-based markers, such as square markers, circle markers, the linecode marker is not only just easier to set up in complex industrial environment, but also makes it possible to use AR in industrial plant. In order to evaluate the tracking accuracy, trackable distance of the proposed tracking method, an evaluation experiment was conducted in a large room. The experiment results show that: comparing with traditional marker-based tracking method, tracking possible distance extends extremely; tracking accuracy improved to a level of 20cm in 10m distance.
Ishii, Hirotake*; Bian, Z.*; Sekiyama, Tomoki*; Shimoda, Hiroshi*; Yoshikawa, Hidekazu*; Izumi, Masanori; Kanehira, Yoshiki; Morishita, Yoshitsugu
no journal, ,
This study is to development of line-marker and hybrid tracking technology including Multi camera and gyro sensor. Evaluation experiment for new tracking technology is conducted in Nuclear power plant.
Ishii, Hirotake*; Shimoda, Hiroshi*; Bian, Z.*; Nakai, Toshinori*; Izumi, Masanori; Morishita, Yoshitsugu; Kanehira, Yoshiki*
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three workers used the prototype system along with a scenario which dismantles an ion tower, and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared to the legacy recording method using paper documents, but a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Shimoda, Hiroshi*; Ishii, Hirotake*; Sekiyama, Tomoki*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
This study aims at developing an augmented reality system to support maintenance work of nuclear power plants. An accurate and wide-range tracking method is required as a key technology in order to realize the system. In this study, a new tracking method using multi-camera and gyro sensor has been developed in order to enlarge the area where the tracking is available with limited number of markers. Experimental evaluation result shows that the area where the developed method can cover is about 3 times larger than the method using single camera.
Ishii, Hirotake*; Shimoda, Hiroshi*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
Improvement of tracking accuracy is an important issue when applying augmented reality to nuclear power plant fieldwork. Tracking accuracy depends highly on the marker arrangement when employing a tracking method using a camera and markers. Tracking accuracy becomes low if markers are pasted arbitrarily only on places that are easy to paste them onto. For those reasons, this study develops a marker arrangement optimization algorithm based on genetic algorithms. Tracking error caused by finite camera resolution is considered particularly in this study. A wheel tracking error computation method is developed to compute the tracking error from the marker arrangement. A genetic algorithm is adopted for obtaining higher tracking accuracy from an initial pool of marker arrangements using wheel tracking error computation as a fitness function. Trial results show that the tracking accuracy can be improved markedly by applying the marker arrangement optimization algorithm.
Ishii, Hirotake*; Bian, Z.*; Sekiyama, Tomoki*; Nakai, Toshinori*; Shimoda, Hiroshi*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
Augmented Reality is one of the promising technologies that will be able to improve efficiency and safety of the nuclear power plant maintenance work. In order to apply the Augmented Reality to the maintenance work, various studies must be done, such as improvement of the tracking technology, improvement of the user interface and human centered evaluation of the Augmented Reality system. The authors have conducted several studies of these issues for almost 5 years. In this paper, a part of these studies are reported.
Shimoda, Hiroshi*; Nakai, Toshinori*; Ishii, Hirotake*; Bian, Z.*; Izumi, Masanori; Morishita, Yoshitsugu
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three professionals used the prototype system along with a scenario which dismantles an ion tower,and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared with the legacy recording method using paper instruction sheet, however a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Izumi, Masanori; Morishita, Yoshitsugu; Shimoda, Hiroshi*; Ishii, Hirotake*; Nakai, Toshinori*; Bian, Z.*
no journal, ,
A support method of decommissioning work of nuclear power plants using Augmented Reality was proposed and a prototype system was developed. Then, using the prototype system, the proposed method was evaluated. Three workers used the prototype system along with a scenario which dismantles an ion tower, and then questionnaire and interview investigation was conducted. As the results, it was found that the proposed method that records the cutting parts on the CAD data using a stylus pen was easy and effective compared to the legacy recording method using paper documents, but a new tablet PC that has a larger screen with lighter weight is necessary in order to apply the proposed method to the real decommissioning work.
Izumi, Masanori
no journal, ,
I would like to explain about the outline of decommissioning and Research and Development for Fugen.
Izumi, Masanori
no journal, ,
It will be reported about outline of Fugen including developing policy, outline and current status of decommissioning program and research and development for Fugen decommissioning.
Izumi, Masanori; Nanko, Takashi; Shibahara, Yuji; Tachibana, Mitsuo; Ishigami, Tsutomu
no journal, ,
The workroad data related the dismantlement of No.3, 4 heater was evaluated and analysised by comparing the actual data and the calculated data.
Shibahara, Yuji; Tachibana, Mitsuo; Ishigami, Tsutomu; Yanagihara, Satoshi; Izumi, Masanori
no journal, ,
no abstracts in English
