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Journal Articles

Adaptation for knowledge management to nuclear research fields

Taruta, Yasuyoshi; Yanagihara, Satoshi*; Iguchi, Yukihiro; Kitamura, Koichi; Tezuka, Masashi; Koda, Yuya

Chishiki Kyoso (Internet), 8, p.IV2_1 - IV2_12, 2018/08

no abstracts in English

Journal Articles

Research concept of decommissioning knowledge management for the Fugen NPP

Taruta, Yasuyoshi; Yanagihara, Satoshi*; Iguchi, Yukihiro; Kitamura, Koichi; Tezuka, Masashi; Koda, Yuya

Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 6 Pages, 2018/07

The IAEA are developed the discussion for those situations and pointed out the importance of nuclear knowledge management. The nuclear knowledge management is developing a database as nuclear knowledge management. In recent years, the IAEA has also advanced knowledge taxonomies on nuclear accidents. These studies are attempts to appropriately arrange and utilize huge amounts of information. Even in nuclear facilities in Japan, it is pointed out that veteran staff aging and loss of knowledge and skill caused by retirement. Therefore, we created a prototype database system to utilize past knowledge and information for ATR Fugen. Now, there are few cases of past decommissioning that can be utilized. This study of pilot model concept revealed that it is not sufficient to just prepare a past data and information. This is what information other than the construction report requires the decommissioning and what kind of information should be gathered.

Journal Articles

The Initiative towards construction of Knowledge Management System in FUGEN Decommissioning Engineering Center

Tezuka, Masashi; Taruta, Yasuyoshi; Koda, Yuya

Dekomisshoningu Giho, (56), p.46 - 54, 2017/09

Implementation of decommissioning needs much plant information in period of Design, construction and operation. In addition, it is essential for efficient dismantling works to advance the technologies, data, lessons and learns, experiences and documents by getting through the decommissioning process. On the other hands, as workers who operated or maintained the plant are aging and retiring, their empirical knowledge has been lost. For the purpose of safety and reasonability of further decommissioning activities, Knowledge Management System (KMS) has been producing in FUGEN which is now under decommissioning. KMS is an initiative of human resources development and to pass on expertise and knowledge to the younger generations. The system based on the prototype of FUGEN aims a high versatility system available for further decommissioning facilities.

JAEA Reports

A Study on optimization of dismantling scenarios in Fugen decommissioning project; Preliminary evaluation of dismantling scenario of the heat exchangers, etc.

Koda, Yuya; Tezuka, Masashi; Yanagihara, Satoshi*

JAEA-Technology 2015-050, 74 Pages, 2016/03

JAEA-Technology-2015-050.pdf:3.43MB

The implementation of the decommissioning work is accompanied by long-term period and considerable expense, so it is important that we make the most optimized work scenario in consideration of safety or the work and effectiveness. For this reason, we are studying selection method of the optimal work scenarios as a management index of the manpower and dose etc., in dismantling work for Fugen. In this report, results of a study shows the method of selecting the best scenarios for the heat exchangers of the reactor coolant purification system by evaluating execution multiple work scenarios, as well as evaluating the manpower and dose, etc., moreover by setting the importance of each evaluation item.

Journal Articles

Estimation of radioactive substance penetration in basement concrete

Tezuka, Masashi; Koda, Yuya; Fujita, Yoshihiko*; Kume, Kyo*

Heisei-26-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 17, P. 78, 2015/10

In order to contribute to the segregated management in accordance with the level of contamination such as dismantling products, as a basis frame concrete specimens of the condenser, which has been laid in the turbine building of the "Fugen", pre-observation of such cracks status of surface on which was carried out to investigate the pollution status of internal specimen.

Journal Articles

Review on conformance to technical criteria for near surface disposal

Tezuka, Masashi; Koda, Yuya; Fujita, Yoshihiko*; Endo, Nobuyuki*; Kume, Kyo*

Heisei-26-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 17, P. 78, 2015/10

In FUGEN, asphalt solidified body which was solidified the concentrated liquid waste is, some of them might also be present which do not meet the criteria (buried technical standards) according to the buried disposal of waste Therefore, these can not be buried disposal remain status quo. Therefore, it is assumed that that may not conform to the above criteria, "Asphalt solid material" is to conform to the reference to "re-processing", in addition to the desk study on specific measures, and also to preliminary tests I went.

Journal Articles

Evaluation of dismantling data in Fugen's decommissioning

Koda, Yuya; Tezuka, Masashi; Aratani, Kenta; Nanko, Takashi

Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 8 Pages, 2015/05

Decommissioning Engineering Center, which is called FUGEN, has started dismantling works based on its decommissioning program since 2008. The dismantling works was launched in turbine system whose contamination was relatively low level. Feed-water-heaters and main-steam-pipes had been dismantled already, and now, main-condensers have been dismantling. Approximately 1000 tons of dismantled waste was produced from the dismantling works so far. Dismantling work needs to be done safely and effectively with appropriate cutting devices depending on the situations that is its method, quality and shape of the materials to be dismantled. Therefore, in FUGEN, varieties of conventional cutting devices, which are thermal cutting method and mechanical cutting method, are used in the dismantling works to evaluate their applicability depending on the work situations. Obtained cutting data are summarized and evaluated in order to reflect to the following own works and other decommissioning plants.

Journal Articles

Decommissioning activities in FUGEN

Kitamura, Koichi; Kutsuna, Hideki; Matsushima, Akira; Koda, Yuya; Iwai, Hiroki

Dekomisshoningu Giho, (51), p.2 - 10, 2015/04

Fugen Decommissioning Engineering Center (herein after called as "FUGEN") obtained the approval of the decommissioning program on February 2008. FUGEN has been carrying out decommissioning works based on its decommissioning program since then. Now is in initial stage, the dismantling works was launched in turbine system whose contamination was relatively low level and their various data have been accumulating. And the draining heavy water, tritium decontamination and transferring of heavy water were carried out safely and reasonably. The preparation for the clearance system and the research and development works for the reactor core dismantling have been progressed steadily as well. Meanwhile, FUGEN has affiliation with local industries and universities for collaboration research, and has exchanged the decommissioning information with domestic and overseas organizations continuously.

JAEA Reports

Document collection of the 30th Technical Special Committee on Fugen Decommissioning

Kutsuna, Hideki; Koda, Yuya; Imagawa, Yasuhiro

JAEA-Review 2014-045, 38 Pages, 2015/01

JAEA-Review-2014-045.pdf:67.33MB

Fugen Decommissioning Engineering Center, in planning and carrying out our decommissioning technical development, has been establishing "Technical special committee on Fugen decommissioning" which consists of the members well-informed, 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 "The Current Situation of Fugen Decommissioning", "Evaluation for Dismantlement Work Experience on Turbine System and its Future Plan" and "Completion of Taking-Out Heavy Water from Fugen", presented in the 30th Technical special committee on Fugen decommissioning which was held on September 19, 2014.

JAEA Reports

Evaluation formulas of manpower needs for dismantling of equipment in FUGEN, 3; Dismantling process of the condenser removal

Kubota, Shintaro; Izumo, Sari; Usui, Hideo; Kawagoshi, Hiroshi; Koda, Yuya; Nanko, Takashi

JAEA-Technology 2014-022, 22 Pages, 2014/07

JAEA-Technology-2014-022.pdf:3.5MB

Japan Atomic Energy Agency (JAEA) has been developing the PRODIA code which supports to make decommissioning plan and has been preparing evaluation functions. Manpower needs for the dismantling the condenser that had conducted from 2010 to 2012 was analyzed and compared with existing evaluation functions. Applicability of evaluation function for a large scale reactor facility was confirmed in dismantling of the heat insulating materials and feed water heaters and reliability of unit productivity factor was improved. Evaluation function of work for clearance was made in dismantling of pipes and supports. Statistically meaningful data was provided from the dismantling of the condenser. Manpower needs for dismantling of a condenser has positive correlation to the weight of equipment and can be described in linear expression. Reliability of each unit productivity factor will be improved with accumulating actual dismantling data in future.

JAEA Reports

Document collection of the 26th Technical Special Committee on Fugen Decommissioning

Kutsuna, Hideki; Koda, Yuya; Shibahara, Yuji; Kadowaki, Haruhiko

JAEA-Review 2012-040, 36 Pages, 2013/01

JAEA-Review-2012-040.pdf:8.2MB

Fugen Decommissioning Engineering Center is establishing "Technical special committee on Fugen decommissioning" which consists of the members well-informed, 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 "The Current Situation of Fugen Decommissioning", "The Application Results of Various Cutting Methods in the Dismantling of the Equipments of the Turbine System", "Study of Work Program on the Dismantling Activities with the Project Management Data Evaluation System", "Record and Knowledge in Working for a Heavy Water Withdraw and a Tritium Removal", presented in the 26th Technical special committee on Fugen decommissioning which was held on September 13, 2012.

Oral presentation

Radioactive waste engineering

Tajiri, Tsuyoshi; Kiyota, Shiko; Hayashi, Hirokazu; Koda, Yuya

no journal, , 

An abolition measure is introduced in the "radioactive waste engineering" lecture in Fukui University of Technology. The situation of the abolition measure of a nuclear power plant, the abolition measure plan of "Fugen", and the abolition measure of "Fugen" is entitled, and a lecture is performed 3 times. The 1st time : The system of an abolition measure, the outline of technical 2nd: "Fugen" which is needed for the track record abolition measure of an abolition measure in and outside the country, The outline of the abolition measure plan of "Fugen", residual-radioactivity evaluation, the 3rd time of safety evaluation: The principal technologies in an abolition measure, system decontamination, remote-dismantling technology of a nuclear reactor main part, technology applied to the abolition measure of "Fugen" with the situation

Oral presentation

Trial manifacture of the cracked concrete cutting tool

Koda, Yuya

no journal, , 

We plan with the dismantling of the equipment associated with the decommissioning of "Fugen", be dismantled in order even the basics such as concrete frame. If the concrete of these have a crack in the surface layer due to aging, etc., from the possibility that radioactive material has penetrated the cracks section can not be ruled out necessarily, processing "waste not a radioactive waste (NR)" as-in order to dispose of, it is necessary to separate physically the crack site. However, when implementing the separating operation in a nuclear reactor facility, in consideration to establish a method for implementing and reasonably safe working is a problem the diffusion preventing dust which may contain radioactive material. For implementing the measures described above, the case is intended to present a challenge in the 29th Open Seminar.

Oral presentation

Trial manufacture and study of the cracked concrete cutting tool

Koda, Yuya

no journal, , 

For a basic understanding stand concrete of interest of dismantling work in the decommissioning of "Fugen", in. Concrete foundation that aims to treat and dispose as waste not "radioactive waste, aging, etc. If it has a crack on the surface due to the possibility of liquid (radioactive material) is penetrated into cracks portion can not be ruled out always, it is necessary to separate the cracking unit. So trial in this business last year it is to produce a machine, could be obtained (30 mm depth of cut, dust scattering prevention) of certain results. however, in order to solve the non-achievement issues and challenges that are newly extracted, and improve the prototype since it is necessary to, it is intended to present as technical problems at the 32nd open Seminar.

Oral presentation

A Study on optimization of dismantling scenarios in Fugen decommissioning project

Koda, Yuya; Mizui, Hiroyuki; Tezuka, Masashi; Yanagihara, Satoshi*

no journal, , 

In order to implement reasonably safe and decommissioning, in consideration of the work and weight-pollution form of facilities and equipment that the dismantling target, plans to more than one scenario in advance, optimal scenario from the be selected is important. For this reason, intended for dismantling work you are planning in a nuclear reactor decommissioning Research and Development Center ("Fugen" below), as an indicator of various data management work manpower, exposure dose, amount of waste, the optimal scenario I was examined evaluation methods.

Oral presentation

A Study on optimization of dismantling scenarios in Fugen decommissioning project, 2

Koda, Yuya; Tezuka, Masashi; Yanagihara, Satoshi*

no journal, , 

In this study, in order to achieve high accuracy of the evaluated dismantling scenario, review of realistic dismantling scenario identify the problems of the simple dismantling scenario, details of the dose map, consider the optimal dismantling scenario selection evaluation method (weighted, points with, etc.), I tried to improve the assessment accuracy make such equipment internal dose assessment at the time of dismantling (evaluation using the Monte Carlo method).

Oral presentation

A Study on optimization of dismantling scenarios in Fugen decommissioning project, 3

Koda, Yuya; Tezuka, Masashi; Yanagihara, Satoshi*

no journal, , 

In order that we implement the decommissioning safe and reasonable, which is important to select the optimal scenario assuming multiple scenarios in advance in the discussion stage of the dismantling work. We assume a realistic simple dismantling scenario to target the turbine equipment and reactor coolant purification system equipment, it has been studied technique to select the optimal dismantling scenario as the PMD evaluation item of Work artificial number, worker exposure dose, etc. In this presentation, we report the results of a study for the heavy water, helium-based equipment.

Oral presentation

Integration of knowledge management support system for the decommissioning of nuclear facilities, 3

Iguchi, Yukihiro; Yanagihara, Satoshi*; Tezuka, Masashi; Koda, Yuya; Kato, Yasuaki

no journal, , 

no abstracts in English

Oral presentation

Open public in University of Fukui Tsuruga campus; Animation of dismantling plan review by the BIGPAD

Iguchi, Yukihiro; Koda, Yuya; Kato, Yasuaki

no journal, , 

Fugen overview and, I publish for the University of Fukui and dismantling animation Fugen was take advantage of the optimization study and VRdose of dismantling scenarios that are working as joint research.

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