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JAEA Reports

Decommissioning of Pre-dismantling Temporary Waste Storage Facility 3 (FPG-03a,b,c) in Plutonium Fuel Production Facility

Shinozaki, Masaru; Aita, Takahiro; Iso, Takahito*; Odakura, Manabu*; Haginoya, Masahiro*; Kadowaki, Hiroyuki*; Kobayashi, Shingo*; Inagawa, Takumu*; Morimoto, Taisei*; Iso, Hidetoshi; et al.

JAEA-Technology 2021-043, 100 Pages, 2022/03

JAEA-Technology-2021-043.pdf:7.49MB

It is planned that the MOX (Mixed Oxide) from the decommissioned facilities in Nuclear Fuel Cycle Engineering Laboratories is going to be consolidated and stored stably and safely for a long term in Plutonium Fuel Production Facility of the Plutonium Fuel Development Center of Nuclear Fuel Cycle Engineering Laboratories. For this purpose, it is necessary to pelletize nuclear fuel materials in the facility and store them in the assembly storage (hereinafter referred to as "waste packaging work") to secure storage space in the plutonium material storage. As a countermeasure to reduce the facility risk in this waste packing work, it was decided to construct a new powder weighing and homogenization mixing facility to physically limit the amount (batch size) of nuclear fuel materials handled at the entrance of the process. In order to secure the installation space for the new facility in the powder preparation room (1) (FP-101), the pre-dismantling temporary waste storage facility 3 (FPG-03a, b, c) was dismantled and removed. This facility consists of a granulating and sizing facility, an additive mixing facility, and a receiving and delivering guided facility, which started to be used from January 1993, and was discontinued on February 3, 2012 and became a waste facility. Subsequently, the dismantling and removal of the interior equipment was carried out by pellet fabrication section for glove operation to reduce the amount of hold-up, and before the main dismantling and removal, there was almost no interior equipment except for large machinery. This report describes the dismantling and removal of the glove box and some interior equipment and peripherals of the facility, as well as the Green House setup method, dismantling and removal procedures, and issues specific to powder process equipment (dust, etc.).

JAEA Reports

Development of dry rework technology in MOX fuel fabrication process; Selection and characterization of pulverizer for particle size adjustment of dry recycled powder

Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Segawa, Tomomi; Kawaguchi, Koichi; Ishii, Katsunori

JAEA-Technology 2021-002, 31 Pages, 2021/05

JAEA-Technology-2021-002.pdf:4.37MB

In the MOX fuel fabrication process, a dry recycle technology has been developed to effectively utilize dry recovered powder obtained by crushing out of specification MOX pellets. The particle size of the dry recovery powder is divided into three classes; coarse size (about 250 $$mu$$m or less), medium size (about 100 $$mu$$m or less), and fine size (about 10 $$mu$$m or less) by the current crushers, and the effect of controlling the density of sintered pellets is obtained to a certain extent by adding the dry recovered powder to the raw powder. In this report, with the aim of more finely adjusting the particle size of the dry recovery powder, a buhrstone mill and a collision plate-type jet mill were selected as grinders that can adjust the dry recovered powder within a particle size range of 250 $$mu$$m or less, and the particle size adjustment test was conducted to pulverize the tungsten-carbide-cobalt (WC-Co) pellets as a simulated material for the MOX pellets. The buhrstone mill can control the particle size within a certain range by adjusting the grindstone clearance, but particles with a particle size of 250 $$mu$$m or more may be discharged. On the contrary, it is expected that the particle size of the collision plate-type jet mill can be controlled in the range of 250 $$mu$$m or less by adjusting the classification zone clearance. Therefore, the collision plate-type jet mill is more suitable for adjusting the particle size of the dry recovered powder than the buhrstone mill.

Journal Articles

The Evaluation of the properties of the collision-plate-type jet mill for dry recycling of MOX powder

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

Funtai Kogakkai-Shi, 57(9), p.478 - 484, 2020/09

A collision plate type jet mill is assumed to be a pulverizer that can control the particle size for nuclear fuel fabrication. The collision plate type jet mill consists of two modules, a classifier and a mill chamber. Coarse component of powder is cycled in the equipment and finally pulverized into objective particle size. In this report, simulated crushed powders were classified and pulverized step by step, and particle size distribution were compared. The collision plate type jet mil can produce objective size particles with low overgrinding.

Journal Articles

Technological development of the particle size adjustment of dry recovered powder

Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Kawaguchi, Koichi; Ishii, Katsunori; Sato, Hisato; Fukasawa, Tomonori*; Fukui, Kunihiro*

Proceedings of International Nuclear Fuel Cycle Conference / Light Water Reactor Fuel Performance Conference (Global/Top Fuel 2019) (USB Flash Drive), p.738 - 745, 2019/09

In the MOX fuel fabrication process, the dry grinding technology of mixed oxide pellets have been developed for the effective use of nuclear fuel materials. To develop a technology to control the particle size of dry recovered powder, the performance of the buhrstone mill and the collision plate type jet mill were studied using a simulated powder of particle size distribution about 500 $$mu$$m. We found that the particle size can be controlled at the range of about 250 $$mu$$m or less by both by adjusting the clearance between the grinding wheels of the buhrstone mill, and the clearance and elevation angle of the clarification zone of the the collision plate type jet mill. And furthermore, the collision plate type jet mill is considered to be suitable for particle size control because the operating parameters of the classifier can be finely adjusted.

Journal Articles

None

Gunji, Yasutoshi; ; ; ; Iso, Hidetoshi

Donen Giho, (71), p.46 - 51, 1989/09

Oral presentation

Technological development of the particle size adjustment of recycle powder, 3; Optimization study of collision plate-type jet mill

Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Sato, Hisato

no journal, , 

The optimizing the centrifugal classifier which influences the classification performance of collision plate-type jet mill was examined for the purpose of the particle size adjustment of recycle powder the MOX pellets. In order to adjust the particle size of recycle powder to 10-250 $$mu$$m, the pulverization test of the simulated raw powder was carried out using the newly prepared components as a parameter. The prospect that the particle size can be adjusted within the range of 10-250 $$mu$$m for recycle powder was obtained by optimizing the parameter of the centrifugal classifier of collision plate-type jet mill.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 2; Selection and evaluation of pulverizers

Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Sato, Hisato

no journal, , 

no abstracts in English

Oral presentation

Pulverization characteristics of a collision plate type jet mill for particle size adjustment of recovered powder in the MOX fuel fabrication process

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

The reworking of out of specification pellets is required for the effective use of nuclear fuel material and for reduction of the plutonium inventory in fuel fabrication facilities. It is known that the sintering density of mixed oxide pellets can be controlled without a pore-former by controlling the amount and particle size of the recovered powder in the raw powder. The collision plate type jet mill was separated into the classifier and the mill chamber, and these modules were used independently. The peak position shifted to smaller sizes gradually over the five cycles of classification and pulverization. The collision plate type jet mill is a promising form of equipment to obtain particles with objective sizes as the main component of a powder.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 4; Pulverization characteristics of collision plate-type jet mill

Makino, Takayoshi; Yamamoto, Kazuya; Segawa, Tomomi; Kawaguchi, Koichi; Iso, Hidetoshi

no journal, , 

The purpose of this study is to develop technology of the particle size adjustment of dry recovered powder of MOX pellets. Pulverization and classification experiments were conducted using simulated pellets obtained from materials having similar hardness and different density (specific gravity). We report that the results of pulverization and classification experiments in which experimental parameters were the clearance of the centrifugal classifier affecting the classification performance of the collision plate type jet mill.

Oral presentation

The Evaluation of the properties of the collision-plate-type jet mill for dry recycling of MOX powder

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

Collision plate type jet mill is a promissing pluverizer which can adjust particle size of a recycling powder in dry recycling of MOX fuel scrap pellet in a fuel manufacturing process for fast reactors. The equipment consists of a classifier chamber and a pluverizer chamber, and particle size of collected powder can be adjusted by controling the operational parameter of the classifier. The examination focused on the pluverizer was performed, and it was confirmed that coarse component is pluverized without overgrinding.

Oral presentation

Research on the improvement of particle size adjustment technology of dry recovered powder and the sintered density control

Segawa, Tomomi; Kawaguchi, Koichi; Ishii, Katsunori; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Fukasawa, Tomonori*; Fukui, Kunihiro*

no journal, , 

Japan Atomic Energy Agency has been used out of specification mixed oxide (MOX) pellets as a dry recovered powder for the effective use of nuclear fuel material in the MOX fuel fabrication process. The densities of the sintered MOX pellets can be controlled to about 85 %T.D. without adding pore former by adjusting the amount and the particle size of the dry recovered powder into the raw powder. It is required to adjust the particle size of the dry recovered powder to under 250 $$mu$$m, the influence of the operating parameters of the collision plate-type jet mill on the characteristics of pulverization and the influence of pulverized powders on sintering properties were evaluated. The clearance was narrowed, the pulverized powders were confirmed to be adjusted for the particle diameter of under 250 $$mu$$m, and the pellet prepared from the pulverized powder with density of about 85.0 %T.D. was obtained.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 5; Evaluation of the particle size adjusted powder on the sintered pellet characteristics

Yamamoto, Kazuya; Segawa, Tomomi; Makino, Takayoshi; Kawaguchi, Koichi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

no abstracts in English

Oral presentation

Technological development of the particle size adjustment of recycle powder, 7; Study on sintering density prediction method for the pellet with dry recycled powder

Kawaguchi, Koichi; Yamamoto, Kazuya; Segawa, Tomomi; Ishii, Katsunori; Makino, Takayoshi; Iso, Hidetoshi

no journal, , 

Pellet sintering density data obtained from experiments changing the mixing ratio of simulated raw material powder and simulated dry recovery powder from 10:0 to 0:10 were analyzed. A method of predicting the pellet sintering density from particle size distribution of the dry recovery powder and the mixing ratio was examined.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 6; Study on test facility for dry recycling of MOX powder and development of sintered density control technology

Yamamoto, Kazuya; Segawa, Tomomi; Makino, Takayoshi; Kawaguchi, Koichi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

no abstracts in English

Patent

回転式粉体圧縮成型機

磯 秀敏; 塙 幸雄; 川口 浩一

岩崎 隆*; 小根田 好次*; 村田 幸次*; 加藤 光昭*

JP, 2013-004835  Patent licensing information  Patent publication (In Japanese)

【課題】臼孔の内周面及び下杵の上端面の略全域に必要十分な量の潤滑剤を塗布し、かつ回転盤の上表面に潤滑剤が付着しないようにする。 【解決手段】回転盤31に、臼孔4の内周面に開口する内部通路Z1を開設しておき、粉体が充填される前の臼孔4の内周面及び当該臼孔4に挿入されている下杵6の上端面に、当該内部通路Z1を介して、当該臼孔4の側方から潤滑剤を噴射する。同時に、内部通路Z1を介して臼孔4内に噴射された潤滑剤を、当該臼孔4の直上に位置する吸引部材Z3によって吸引する。

15 (Records 1-15 displayed on this page)
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