JOPSS - Search Results

Journal Articles

Analytical surveillance on production methods of homogeneous and uniform solid materials from spent ion exchange residuum after ion coupled plasma volume-reduction process

Otani, Hiroshi; Mizui, Hiroyuki; Higashiura, Norikazu; Bando, Fumio*; Endo, Nobuyuki*; Yamagishi, Ryuichiro*; Kume, Kyo*

Heisei-25-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 16, P. 66, 2014/10

no abstracts in English

Journal Articles

Radwaste reduction technology for spent resins

Aizawa, Hideyuki*; Katagiri, Genichi*; Sano, Kazuya; Higashiura, Norikazu

Fuji Denki Homu Peji and Fuji Denki America Sha Homu Peji (Internet), 11 Pages, 2012/04

http://www.americas.fujielectric.com/engineers-room/white-papers

In a nuclear power plant, spent IXR (hereafter called SR), low-level radioactive waste, is produced from water purification systems in association with the operation of the plant. These SR are different in a radioactive concentration depending on purification systems, and SR which is relatively higher in the radioactivity concentration is stored in the nuclear power plant. Stored amounts continue to increase year after year. In Japan, it is planned that SR will be buried in the ground in the future as a "waste solid" which is solidified in a specific metal container. In terms of securing long-term soundness of the waste solids, it is said the solidification of the SR is required after stabilization treatment is performed. Moreover, SR with high radioactivity concentration requires higher disposal expenses; therefore, the reduction of the disposal volume is required in terms of cost-cutting. To realize these requirements, processing technologies are required which satisfy both the volume reduction and stabilization of the SR at once. Fuji Electric is continuing to develop LPOP technology and the equipment (FRR: Fuji Resin Reducer) as technologies to respond to these requirements. LPOP treatment is a technology enabling realization of both volume reduction and stabilization of SR which is low-level radioactive waste. Fuji Electric post the overview of LPOP technology and the results of mineralization of ion exchange resin and solidification tests executed for the purpose of evaluating the effect of LPOP treatment aiming the burial disposal on our website.

Journal Articles

Performance verification test on wet-blast type decontamination for the clearance

Hamada, Nobuyuki; Watanabe, Junji; Higashiura, Norikazu; Shime, Masanori

Dekomisshoningu Giho, (45), p.2 - 9, 2012/03

http://www.randec.or.jp/publish/documents/gihou/Decommissioning%20gihou_45.pdf

The manual type wet blast apparatus had been introduced to remove the surface contaminations of the radioactive waste, as the preprocessing for the clearance. Decontamination test had been carried out to survey the optimum condition for the decontamination with using specimens obtained from facilities and equipments which will be planned to be cleared. As the results, we confirmed that the apparatus has the performance to reduce the surface radioactive concentration on the inside of the tube to under the clearance level within relatively short time.

JAEA Reports

Document collection of the 24th Technical Special Committee on Fugen Decommissioning

Otani, Hiroshi; Matsushima, Akira; Mori, Naoto; Kutsuna, Hideki; Higashiura, Norikazu

JAEA-Review 2011-041, 55 Pages, 2012/01

JAEA-Review-2011-041.pdf:6.08MB

In planning and carrying out decommissioning technical development of Fugen, "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 Decontamination Experiment with using Heavy Water System Equipment", "Laser Cutting Test on Dust Behavior in Cutting Work in Air", "Preparatory Situation for Operation of Clearance System" of this committee.

JAEA Reports

Document collection of the 22nd Technical Special Committee on Fugen Decommissioning

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.

Journal Articles

Study of LPOP residue on resin mineralization and solidification

Katagiri, Genichi*; Fujisawa, Morio*; Sano, Kazuya; Higashiura, Norikazu

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.125 - 130, 2010/10

https://doi.org/10.1115/ICEM2010-40112

Fuji Electric had developed the low pressure oxygen plasma technology for mild decomposition and mineralization of an organic material such as ion exchange resin. This method is suitable for radioactive spent resin volume/weight reduction and stabilization for final disposal. On this process, the ion-exchange resins are vaporized and decomposed into gas-phase with pyrolysis, and then, they are decomposed and oxidized with low-pressure plasma activity based on oxygen. And this process is achieved under moderate condition for radio active waste. (1) incinerate temperature: 400-700 $^{circ}$ C (2) low-pressure (low-temperature) plasma condition: 10-50 Pa. From the result of this process, named of LPOP(low pressure oxidation process) by the inductively coupled plasma, we have confirmed that the process is applicable for organic fireproof waste including ion-exchange resin, and found that the used resin treatment performance is the same as cold test.

Journal Articles

The Introduction of New Waste Treatment System at the Fugen Nuclear Power Station

Tezuka, Masashi; Iwai, Masaki; Sana, Kazuya; Higashiura, Norikazu

Proceedings of International Waste Management Symposium 2005 (WM '05) (CD-ROM), 0 Pages, 2005/00

Advanced Thermal Reactor Fugen Nuclear Power Station is planning to introduce 'spent resin volume reduction and stabilization processing device' and 'laundry drain filtering device' in radioactive waster treatment system. As for the former device, we demonstrated sufficient performance of this device by carrying out the confirmation test using real spent resin relating to the following points: performance of volume and weight reduction; change to inorganic material; detoxification; and retention and transfer of nuclide, etc. As for the latter device, we are studying two methods now. However, we confirmed that it is possible to apply the removal performance of radioactivity and Chemical Oxygen Demand to real machine by carrying out hot test.

Journal Articles