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Nakazawa, Osamu; Takiya, Hiroaki; Murakami, Masashi; Donomae, Yasushi; Meguro, Yoshihiro
JAEA-Review 2023-012, 6 Pages, 2023/08
JAEA-Review-2023-012.pdf:0.93MB
The selection of back-end technology development issues to be prioritized and their schedule of the Japan Atomic Energy Agency (JAEA) have been put together as the "Strategic Roadmap for Back-end Technology Development." The results of questionnaires on development technologies (seeds) and technical issues (needs) within JAEA conducted in FY2022 were reflected in the selection. The issues were extracted from among those that match the seeds and needs, from the perspective of early implementation in the work front and the perspective of common issues, and nine themes were selected. We will build a cross-organizational implementation framework within JAEA and aim to implement the development results in the work front as well as social implementation.
Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi; Miyakoshi, Hiroyuki; Takamatsu, Misao; Sakamoto, Naoki; Isozaki, Ryosuke; Onishi, Takashi; et al.
JAEA-Review 2021-020, 42 Pages, 2021/10
JAEA-Review-2021-020.pdf:2.95MB
The disposal of radioactive waste from the research facility need to calculate from the radioactivity concentration that based on variously nuclear fuels and materials. In Japan Atomic Energy Agency Oarai Research and Development Institute, the study on considering disposal is being advanced among the facilities which generate radioactive waste as well as the facilities which process radioactive waste. This report summarizes a study result in FY2020 about the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute.
Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi
JAEA-Review 2020-015, 66 Pages, 2020/09
JAEA-Review-2020-015.pdf:4.27MB
The disposal of radioactive waste from the research facility need to calculated from the radioactivity concentration that based on variously nuclear fuels and materials. In Japan Atomic Energy Oarai Research and Development Institute, the study on considering disposal is being advanced among the facilities which generate radioactive waste as well as the facilities which process radioactive waste. This report summarizes a study result in FY2019 about the evaluation method to determine the radioactivity concentration in radioactive waste on Oarai Research and Development Institute.
Sakauchi, Hitoshi; Sato, Isamu*; Donomae, Yasushi; Kitamura, Ryoichi
JAEA-Technology 2015-059, 352 Pages, 2016/03
JAEA-Technology-2015-059.pdf:51.53MB
OWTF (Oarai Waste Reduction Treatment Facility) is constructed for volume reduction processing and stabilization treatment of 
solid waste, which was generated from hot facilities in Oarai Research and Develop Center of Japan Atomic Energy Agency, using in-can type high frequency induction heating by remote control. This report describes corroborative tests, in which incinerating and melting performance for OWTF is confirmed with a full-scale testing furnace. We have been carrying out the tests of incinerating and melting treatment with some kinds of simulated wastes, such as enclosure form of radioactive wastes, material and articles.
Kawatsuma, Shinji; Ishikawa, Keiji; Matsubara, Tatsuo; Donomae, Yasushi; Imagawa, Yasuhiro
Dekomisshoningu Giho, (33), p.67 - 74, 2006/03
no abstracts in English
Wada, Yusaku; Okubo, Toshiyuki; Miyazaki, Hitoshi; none; Donomae, Yasushi
JNC TN9410 2005-007, 94 Pages, 2005/03
JNC-TN9410-2005-007.pdf:6.07MB
None
; ; ; Miyazaki, Hitoshi
JNC TN9410 2002-014, 120 Pages, 2002/11
JNC-TN9410-2002-014.pdf:5.97MB
LEDF (Large Equipment Dismantling Facility) will be constructed for the purpose of decontaminating the high level $alpha solid waste generated in oarai engineering center of JNC. And, main processing process of LEDF is incineration and melting system. LEDF will be intended to reduce the secondary waste that occurs along with the operation of the off gas processing equipment of incineration and melting system. It assumed that we are able to eliminate the adsorption tower using silica gel, if the decontamination factor to volatile ruthenium is able to expect in the packed scrubber that is established to remove harmful gas. Thereupon, we carried out this tests that eliminates the adsorption tower and reduces the secondary waste. The decontamination factor (DF) to the volatile ruthenium by the water scrubber is confirmed in the established institution which is in Tokai Works. However, decontamination factor differs and depends on the ruthenium concentration, harmful gas concentration, washing method and also washing condition. Also, the DF value to the volatile ruthenium in the off gas that occurs from incineration and melting system is obtained, does not exist under the same condition as LEDF. Therefore, the decontamination factor to the volatile ruthenium of the packed scrubber under the operating condition of LEDF is confirmed by this test. The main result of this study is as follows (1) In the examination of the test device specification, the packed scrubber design method was investigated. And, the test device that maintained the resemblance nature with a real machine was produced on the basis of this result. (2) In the result of the ruthenium occurrence condition confirmation test, it was confirmed that the test condition such as the kind of the oxidizer, hold temperature of the oxidization reaction container that produce volatile ruthenium continuously, (3) In the result of the occurrence temperature influence confirmation test, it was confirmed that the ...
; ; Matsumoto, Yoshihiro; ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi
JNC TN9410 2002-010, 62 Pages, 2002/11
JNC-TN9410-2002-010.pdf:2.37MB
The vaporizer in extinguishing of Large Equipment Dismantling Facility (LEDF)that cost is considering as a plan to cut down as part of a rationalization design highly. When the vaporizer is deleted, it becomes here where liquefied carbon dioxide is emitted in the direct cell, it is necessary to grasp the action and extinguishing performance of the pressure change in the cell by rapid evaporation test of the emitted liquefied carbon dioxide. So pressure action inside the fire laboratory in liquefied carbon dioxide release and a putting out the fire tests due to the combustion time of the combustible were enforced by using the general fire laboratory with Demonstration Test on Extinguishing of the cell (I) in the llth year of Heisei. However, since these tests are after laboratory without airtightness, it needs to grasp the pressure action at the time of liquefied carbon dioxide discharge under the airtight high conditions of having assumed the still more nearly actual cell. The cell (II) Demonstration Test on Extinguishing using the vessel of Sodium Leak Fire and Aerosol test rig (SOLFA-2) container inside of OEC was carried out. The results were as follows. (1)In order to grasp the pressure action of the vessel, the internal pressure of SOLFA-2 was set as -50mmH
O, and emitted liquefied carbon dioxide. Consequently, the tendency for the pressure in the vessel to descend rapidly immediately after liquefied carbon dioxide discharge, and to descend gently-sloping through the process which goes up gradually after that and goes abruptly up for a short time was seen. (2)The process which goes abruptly up in an above-mentioned short time is considered to be the factors with main what some liquefied carbon dioxide emitted in the vessel changed to dry ice, and was deposited taken and sublimating surrounding heat, and evaporating again. (3)It sets to total flooding system and the average minimum temperature in the vessel becomes about -48
C, and at ...
; Matsumoto, Yoshihiro; ; ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi
JNC TN9410 2002-008, 68 Pages, 2002/07
JNC-TN9410-2002-008.pdf:2.89MB
In order to rationalize for Large Equipment Dismantling Facility (LEDF), the plan of removing vaporizer belong to Cell-fire-extinguishing-system was investigated. When a vaporizer is cut down, It is necessary to grasp a fire-extinguishing performance. The fire-extinguishing performance check examination by liquefaction carbon dioxide in the cell fire-extinguishing examination (I) was carried out in 1999 fiscal year. As the result, The good performance was obtained to polyethylene. But there was the deep-seated fire about a piece of wood. Then, The check items were carbon dioxide (CO) concentration and CO concentration holding time for the deep-seated fire in the cell fire-extinguishing examination (III). The results were as follows; (1)By use of the combustion model in which a piece of wood and cotton were put is lit, temperature inside model, mass reduction, and combustion situation were examined. The model burned remarkably in 30
60 min. The peak temperature rise to 680 C(MAX), and attained smoldering after (ignition) 70 min. Moreover, in order to determine the generating conditions of a deep-seated fire, the situation of CO extinguishing after ignition by the time lag of 5090 min were examined. The model around ignition 50 minutes was the most difficult to extinguish, and it turned out that they are the conditions which were most suitable for the deep-seated fire examination model of an exam. (2)In order to decide on CO concentration and concentration holding time required for fire extinguishing of the deep-seated fire in LEDF, The fire-extinguishing performance was investigated by 40 65% of CO concentration. Consequently, CO concentration required for deep-seated fire extinguishing was understood that 60% or more was required when safety was taken into consideration at 50% or more. Moreover, when it was 50% or more of CO concentration and the holding time of CO concentration ...
; ; ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi
JNC TN9410 2002-006, 49 Pages, 2002/07
JNC-TN9410-2002-006.pdf:1.84MB
Construction of LEDF (Large Equipment Dismantling Facility) is being planned by Waste Management Section. This purpose of LEDF is the melting treatment of the radioactive waste in OEC (O-arai Engineering Center) and the waste package in JAERI (O-arai Japan Atomic Energy Research Institute). It is also considered about the disposal plan of the future. Therefore LEDF has the sorting process of waste because of the removal of problematic substances. But that process is conducted using its human eyes. This process needs automatic operation because of high classification accuracy, high reliability, burden reduction of a worker. Then we select EXFS (Energy dispersive X-ray Fluorescence Spectrometer), and conducted the measurement of waste (a sample) with this device. That purpose is to confirm an application as the sorting device. A confirmation result is shown in the following. (1)Sorting performance Measurement is possible without pretreatment, if it is metal. However, sorting is difficult when paint, plating, impurities, etc. are shown in the surface. (2)Measurement position It is necessary to set a gap of the measurement thing from a measurement position to 4㎜ or less. (3)Radiation influence Because the background had risen by the influence of a radiant ray, the distinction of Fluorescence X-ray became difficult. Therefore the distinction of materials became impossible. Aluminum is influenced specially by it. As a conclusion, the application nature of EXFS thing Sorting System is high. But there is a bad influence by radiation. Therefore, difficult is installation into the cell. In order to apply EXFS to LEDF, it is necessary to place it outside the cell and to use as the help of the visual inspection.
Donomae, Yasushi; Matsumoto, Yoshihiro; Kikuchi, Yutaka; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi
JNC TN9410 2001-021, 73 Pages, 2002/01
JNC-TN9410-2001-021.pdf:3.91MB
In order to rationalize for Large Equipment Dismantling Facility (LEDF), the plan of removing vaporizer belong to Cell-fire-extinguishing-system was investigated. In this test, in order to study the behavior of pressure in cell, when the liquefaction carbon dioxide (liq-CO) is emitted, and the performanee of extinguishing fires, the test of behavior of pressure and the extinguishing fires take effect. Also the extinguishing fires test used water-mist take effect for complement liq-CO. The results as follows; (1)In the test of behavior of pressure, Liq-CO was emitted test room under -40mmAq negative pressure. Room pressure was increase about 0.8mmAq/sec at first. After 29sec, the pressure was increase slowly about 0.1mmAq/sec. After 120sec, the increase was drastic about 1.5mmAq/s. (2)In the test of extinguishing fires by liq-CO, under -40mmAq, Polyethylene and wooden chips + cotton (crib) was burn. Polyethylene was extinguished perfectly, but the embers remained in cribs. While the room pressure was increase about 1.3mmAq/sec for 10sec at first. After 30 sec, the pressure was increase about 1mmAq/sec. On the other hand, the drastic increase of pressure disappeared between 100sec to 120sec by change the nozzle size from 14mm
to 10mm. (3)In the test of extinguishing fires by water-mist, Cribs was extinguished perfectly, but Polyethylene was extinguished difficulty under the same condition of liq-CO test. (4)Therefore the results, It's coped with the fire extinguishing and the keeping negative pressure for LEDF cells. Therefore nozzle size is fitted cell volume as changing 14mm to 10mm. (5)As the performance of extinguishing fires by liq-CO, It is necessity the concentration of above 50% CO for combustibles as cribs, remaining the embers. (6)On the other hand, It is necessity most study for the adoption of water-mist. Therefore water-mist was not effective for polyethylene, and it needed water ...
; ; Kato, Noriyoshi; Miyazaki, Hitoshi; Tanimoto, Kenichi
JNC TN9410 2000-002, 149 Pages, 1999/12
JNC-TN9410-2000-002.pdf:23.51MB
LEDF (Large Equipment Dismantling Facility) is the solid waste processing technology development facility that carries out high-volume reduction and low dosage processing. The high-volume reduction processing of the high dose -waste configured with combustible waste, pvc & rubber, spent ion exchange resin, and noncombustible waste have been planned the incinerating and melting facility using the in-can type high frequency induction heating in LEDF. This test is intended to clarify the design data. It was confirmed that the incinerating and melting performance, molten solid properties and exhaust gas processing performance with pilot testing equipment and bench scale equipment. The result of this test are as follows. (1)Processing speed is 6.7kg/h for the combustible waste, 13.0kg/h for the ion exchange resin, and 30.0kg/h for the noncombustible waste. For above optimum processing conditions are as follows. (a)Operating temperature is 1000C for the combustible waste, 1300C for the ion exchange resin, 1500C for the noncombustible waste. (b)Air flow is 90Nm
/h. Air temperature is 300C. Air velocity is 20m/s. (2)Incineration time per day is 5h. Warm-up time and incineration time from the stop of waste charging is 0.5h. Melting time per day is 5h inconsideration of heating hold time of incinerated ash and melting of quartz. Warm-up time is 0.5h. (3)The system decontamination factor in Co, Cs and Ce with pilot testing equipment is 10
or more. (4)Design data of the iron doped silica gel judged to be have a applicability as RuO
gas absorber is as follows. (a)Its diameter distribute in the range of 0.8-1.7mm. (b)To have a decontamination factor of 10 can achieve for retention time of 3 seconds and its life time is about 1 year. (5)In terms of the distribution of the nuclear species in molten solid is evenly distributed. It was also confirmed that the distribution of main elements in ceramic layer is ...
; ; ; Tanimoto, Kenichi
JNC TN9410 99-006, 74 Pages, 1999/04
To decontaminate radioactive waste occurred in nuclear fuel facilities to minimize radiation dose level of the waste, electro-polishing method have been developed in JNC. In this paper, many experiments were performed to get data that were necessary to design electro-polishing equipment. Results of the examinations are as follows. (1)Distance between an electrode and flat board test piece was varied from 10 to 100 mm, electric current density was 0.2A/cm, and executing time was 20 minute. In above case, we measured polishing weight of both sides of the test piece to clear polishing distribution in waste surface. The longer the distance between two electrodes, the nearer weight of reverse side became to front side. In the case, best distance between the test piece with electrode is 100mm. (2)Using flat board, angle, pipe, and bolt, shape dependence test was performed. Over 10min. , all the test piece with any shape got a thickness of 10
m or more. (3)The electro-polishing equipment ran 85 hour in our experiments. Because remarkable change was appeared in polishing weight and injection voltage over 50 hour, life time of electrolytic solution was 50 hour.
; ; ; Tanimoto, Kenichi; Enokido, Yuji
PNC TN9410 93-053, 99 Pages, 1993/03
It is must deceasse the pool risk for the radio active wastes. So it is necessary to decontaminate the wastes low level (
500Sv/h) during control the secendry wastes. Had been product the decontaminations hood system for scattaring proof. For that, high-pressure ice brasting method tested using the system. The number of the test piece was 12 from MMF. The resultes is as follows; (1)The hood system have good capacity for scattering proof and remort handling. (2)Aa the test condition, the pressure and the flux was used 9kgf/cm and 6m/min, feed volume was used 2kg/min. From the results, the number of test piece being low level (500Sv/H) was 7, containing of ten several mSv/h wastes, from among. The lesves could not decontaminate. (3)The contamination in the hood was decreased from 87mSv/h to 3mSv/h by nomal pressuer icebrasting (the pressure is 4kgf/cm, 2m/min, the feed volume is 1 kg/min).
Matsumoto, Takeshi; Donomae, Yasushi; Kakuta, Toshiya*; Kuchiki, Norikazu*; Sato, Koji*
no journal, ,
JP, 2007-218796 Patent publication (In Japanese)
no abstracts in English
Kakuta, Toshiya*; Kuchiki, Norikazu*; Sato, Koji*; Matsumoto, Takeshi; Donomae, Yasushi
no journal, ,
JP, 2007-218796 Patent publication (In Japanese)
no abstracts in English
Asakura, Kazuki; Shimomura, Yusuke; Donomae, Yasushi; Abe, Kazuyuki; Kitamura, Ryoichi
no journal, ,
no abstracts in English
