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Bart, G.*; Bakker, K.*; Hellwig, C.*; Kihara, Yoshiyuki; Ozawa, Takayuki; Wallin, H.*; Shigetome, Yoshiaki
Journal of Nuclear Science and Technology, 44(3), p.329 - 336, 2007/03
Times Cited Count:4 Percentile:37.26(Nuclear Science & Technology)Within the FUJI collaboration program among Japan Atomic Energy Agency (JAEA, former JNC), Paul Scherrer Institute (PSI, Switzerland) and Nuclear Research and Consultancy Group (NRG, the Netherlands) the production paths of plutonium and neptunium mixed oxide- (sphere-pac- and vipac-) particle fuels (20wt% Pu and 5wt% Np) are tested as well as the initial sintering and power-to-melt behavior under simulated FBR conditions. The various fuel forms were produced at PSI under the support of JNC, the irradiations were accomplished at High Flux Reactor (HFR) in Petten, the post irradiation examinations are being achieved mainly at NRG and the fuel modelling being performed at JNC and PSI. The present paper reviews mainly the project planning, fuel behaviour- pre-calculations and the fuel- and fuel segment- production. A short overview of the irradiation conditions and ceramographic post irradiation examination analyses is also given.
Morihira, Masayuki; Ozawa, Takayuki; ; Suzuki, Masahiro; Shigetome, Yoshiaki; Kihara, Yoshiyuki; Kono, Shusaku
JNC TN8400 2004-014, 193 Pages, 2004/07
The collaboration project concerning sphere-pac fuel among JNC, Swiss PSI (Paul Scherrer Institut) and Dutch NRG (Nuclear Research and Consultancy Group) is in progress.Final target of the project is comparative irradiation tests of Sphere-pac fuel in the HFR (High Flux Reactor) in Petten in the Netherlands with pellet type fuel and vipack fuel. Total 16 fuel segments (8 pins) of these three types of fuel are planned to be irradiated. Two sphere-pac fuel segments contain 5%Np in addition to 20%Pu-MOX. Other segments contain no Np. Fabrication of irradiation test pins was completed till May 2003 in PSI. After transportation of the fuel pins to Petten, two times of irradiation were performed in January to March in 2004 and now post irradiation tests are in progress. Later two irradiations will be done till the autumn in 2004.This report summarized the basic plan, fuel design, and fabrication of irradiation test pins concerning this collaboration project.
Tomita, Yutaka; Shigetome, Yoshiaki; Kihara, Yoshiyuki
Saikuru Kiko Giho, (24), p.1 - 10, 2004/00
JNC has carried out the joint research project with PSI in Switzerland and NRG in Netherlands.In this project, three types of fuel segments (sphere-pac segments, vipac segments and pellet segments) were fabricated by PSI. They have been irradiated under same irradiation condition to compare their performances in the High Flux Reactor. This report describes the fabrication of sphere-pac segments and vipac segments for irradiation tests.
; ; Shigetome, Yoshiaki; Kono, Shusaku;
JNC TN8410 2003-002, 29 Pages, 2003/02
Japan Nuclear Cycle Development institute (JNC) has conducted the collaboration concerning vibro-packed fuels with Paul Scherrer Institut (PSI) in Switzerland and Nuclear Research & consultancy Group (NRG) in the Netherlands. The project "Research and Development of Advanced Sphere-pac fuel" is called FUJI (FUel irradiations for JNC and PSI) Project. In this project, three types of fuels that are sphere-pac fuels, vipac fuels, and pelletized fuels will be irradiated in the High Flux Reactor (HFR) to compare the fuel performance. Based on the drawing which has been agreed among three parties, fabrication of the pin components and welding of the upper and lower connection endplugs were performed in accordance with ISO-9001 in JNC. This report describes data of fabricated pin components, results of welding qualification tests, and quality assurance of the welded components. The fabrication of pin components was successfully completed and they were delivered to PSI in October 2002.
Shigetome, Yoshiaki
JNC TN8410 2003-001, 25 Pages, 2003/02
MOX vipac fuel pins will be fabricated in FUJI project to investigate its potential as a fuel for the future commercialized FBR system. Before the vipac filling test started in PSI, several tests had been conducted to determine the particle size range and preparatory filling tests were performed. In addition, the method to predict the packing fraction was investigated to predict that of the MOX vipac fuel without filling test with MOX particles. As the result of the investigation, the particle size range was specified as 850-25 m. The range was divided into polydisperse six fractions and the mixing ratio was deduced in other project of JNC and slightly adjusted for the FUJI project. Comparison of the particle feeding methods was conducted between the ones with vibration and without vibration, however, it has not been concluded which is better. The effect of particle circularity on the packing fraction was investigated to predict that of MOX. The result shows it would be a promising parameter for evaluation of packing fraction. Since only circularity data of ZrO are available at the moment, data of other material are highly desirable to enhance the validity.
Shigetome, Yoshiaki; Kono, Shusaku; Hellwig, C.*; Heimgartner, P.*
Proceedings of International Conference on Advanced Nuclear Energy and Fuel Cycle Systems (GLOBAL 2003) (CD-ROM), p.1342 - 1347, 2003/00
None
Shigetome, Yoshiaki
JNC TN8410 2002-004, 27 Pages, 2002/05
Vipac fuel pins that are composed of irregular shape fuel granules will be fabricated and irradiated as well as Sphere-pac and pellet fuel pins in the frame of PSI/JNC/NRG collaboration (FUJI project) to compare their performances. This report describes the outline of the past vipac filling performed at ORNL, RIAR and in Japan and the results of the experiments recently conducted in JNC. Main factors that dominate performance of the vipac filling process are vibration condition and granule size distribution. The effect of vibration condition is significant and large acceleration is necessary to generate high packing fraction. In addition, sweeping frequency is necessary to break the bridging of the powder and it is effective to promote the granules movement to settle in the closely packed arrangement. The effect of granule size distribution was examined. One of the promising mixing ratios was deduced through parametric survey. The packing fraction more than 75% would be possible if granule size less than 45 m was applied. Though the small granule size is necessary to obtain high packing fraction, the diameter of the granules must be restricted to prevent the fine granules from infiltrating into the insulator sphere region. Therefore the smallest granule diameter must be defined carefully. Fabrication of vipac pins is one of the most unpredictable processes in this project because both PSI and JNC have quite little vipac experience. Filling test with inactive materials (ZrO and UO) and vipac granule fabrication test have been ongoing to overcome this situation and to allow fabricating vipac pins as close as the targeted specifications. Further investigation of filling process should be performed combined with the results of the vipac fabrication test.
Morimoto, Kyoichi; Shibata, Atsuhiro; Shigetome, Yoshiaki
JNC TN8200 2001-006, 19 Pages, 2001/12
Global2001 (International Conference: "Back-End of the Fuel Cycle: From Research to Solutions ") was held for six days from September 9 to September 14 in Paris in France. In this year, there were about 420 participants from each country and about 70 people participated from Japan. This conference consisted of the reactor and fuel cycle field, the reprocessing field, the disposal field, and the non-proliferation field, etc. The main topics of this conference were the back end of the nuclear fuel cycle, the management of long-lived nuclide, the advanced concept of reactor and fuels. Advanced fuel recycle technology division reported about the feasibility study on commercialized FR cycle systems, the nuclear fuel and the reprocessing process in the oral session and poster session. Each report was audited and information was collected. It is possible to refer to information on Global2001 by the following homepages. http://www.cea.fr/conferences/global2001 /index.him*
Shigetome, Yoshiaki; Harada, Hideo
Nuclear Instruments and Methods in Physics Research A, 469(2), p.185 - 192, 2001/08
Times Cited Count:10 Percentile:59.1(Instruments & Instrumentation)None
; ; Shigetome, Yoshiaki;
Proceedings of International Conference on; Back-End of the Fuel Cycle; From Research to Solutions (GLOBAL 2001), 0 Pages, 2001/00
None
Sato, Yoshihiko; Koyama, Tomozo; Miura, Akihiko; ; ; Shigetome, Yoshiaki
Proceedings of 2nd International Conference on Safewaste 2000, 0 Pages, 2000/10
On march 11,1997, bituminization demonstration facility(BDF) in Tokai Reprocessing Plant (TRP) of power reactor and nuclear fuel development corporation (PNC) made fire and explosion incident. Investigation of the cause of the fire and explosion incident at BDF was carefully conducted. The main cause of the fire is clarified to have been physical heating inside the extruder that provided unusual high temperature of bituminized product at filling. Physical feating is considered to be derived from decrease of feed rate of liquid waste to the extruder. The causes of the explosion are accumulation offlammable gas generated from insufficiently extinguished bituminized product inside the filling room of which the ventilation system was shut doen. The gas was ignited by another ignition of the heated drum.
Shigetome, Yoshiaki; ; ; *; Endo, Hideo
JNC TN8400 2000-023, 84 Pages, 2000/07
This report presents the results of vibration packing experiments and computational simulations of particle compaction behavior. Both sphere and shard particles were evaluated in these works. Experiments with simulated fuel palticles were conducted to investigate the factors affecting packing behavior. The factors are classified into geometrical and dynamics factors. With regard to the geometrical factors for sphere packing, the experimental results prove that the achievablc packing fraction can be predicted by the equation derived by Ayer, which is relationship of inner diameter of cladding and diameters of particles. As for the dynamics factors, less vibration displacement is preferable, because it produccs faster packing with less segregation. Similar experiments were conducted for the shard particles. The results indicate the packing characteristics of the shard particles are different from the sphere particles. Optimum weight ratio between particle sizes is different from the ratio given by Ayer's equation. As for the dynamics factors, the sweeping frequencies while packing were sufficient to obtain high packing fraction. Computational simulations were performed to investigate the particle behavior while packing. The movement of infiltrating and bed particles while packing was well understood.
Harada, Hideo; Furutaka, Kazuyoshi; Shigetome, Yoshiaki; Ogaki, Hideaki*; Toyokawa, Hiroyuki*
AIP Conference Proceedings 529, p.722 - 724, 2000/00
no abstracts in English
Shigetome, Yoshiaki; ;
JNC TN8410 99-035, 62 Pages, 1999/12
The bituminization demonstration facility (BDF) of Tokai reprocessing plant had a fire and explosion incident. Thermal analysis of simulated bituminized products was conducted to investigate the chemical behavior of them. This analysis detected no activating factors which enhance chemical heat reactions. According to the operators' observation, filling temperature of the bituminization product rose to an unusually high temperature before the incident. The overheating effect on the bituminized product was investigated by 'keeping high temperature' test. Hollows and brittle material were generated in the products after the heating. This state is similar to the actual state of the products processed in the BDF from 28 to 29 batch.
Koyama, Tomozo; ; ; ; ; Shibata, Atsuhiro; Shigetome, Yoshiaki
JNC TN8410 99-027, 423 Pages, 1999/12
The bituminization demonstration facility of Tokai Reprocessig Plant had a fire and explosion incident. The cause of the incident was investigated. Also, the facility condition and release of radioactive materials were evaluated. The cause of the fire and subsequent explosion was determined in a two year investigation. The main cause of the fire was that the temperature of the bituminized product rose to an unusually high temperature by a physical heating phenomena inside the extruder, which was caused by the lowering the feed rate of liquid waste. A moderate chemical reaction in the bituminized product continued and consequently the bituminized product overheated and ignited. The cause of the explosion was the accumulation of flammable gases generated from insufficiently extinguished bituminized product in the filling room in which the ventilation system had been shut down. The flammable gas was ignited by another bituminized product that overheated to the flash point temperature. This report details the condition of the facility before and after the incident, cause of the incident, and an evaluated amount of released radioactive materials.
Shigetome, Yoshiaki; ; ; Miura, Akihiko; Sato, Yoshihiko; Koyama, Tomozo
JNC TN8200 99-001, 128 Pages, 1999/07
None
Koyama, Tomozo; ; Miura, Akihiko; ; Sato, Yoshihiko; Shigetome, Yoshiaki
International workshop on the safty and perfo, 0 Pages, 1999/07
None
Shigetome, Yoshiaki; ; Yamanouchi, Takamichi; Oda, Yoshihiro;
PNC TN8410 98-088, 48 Pages, 1998/05
At the fire and explosion incident of Bituminization Demonstration Facility, the fault of cell ventilation system (plugging of the HEPA filter) occurred in a short time. In addition the breakdown of the filter occurred at the explosion which happened ten hours after the extinguishment of the fire. Investigation of filter damage was conducted in order to know the extent of the breakdown, the contamination by radioactivity and soot mass gain of HEPA filter. Scanning electron micrograph (SEM) was also used to observe the appearance of soot adhesion on the filter media. This report shows the result of the investigation.
Harada, Hideo; Furutaka, Kazuyoshi; Shigetome, Yoshiaki
Journal of Nuclear Science and Technology, 35(10), p.733 - 735, 1998/00
None
Harada, Hideo; Shigetome, Yoshiaki
First International Workshop on EGS4, 0 Pages, 1997/00
None