Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Sakakibara, Hiroshi; Aoki, Nobuhiro; Muto, Masahiro; Otabe, Jun; Takahashi, Kenji*; Fujita, Naoyuki*; Hiyama, Kazuhiko*; Suzuki, Hirokazu*; Kamogawa, Toshiyuki*; Yokosuka, Toru*; et al.
JAEA-Technology 2020-020, 73 Pages, 2021/03
JAEA-Technology-2020-020.pdf:8.26MB
The decommissioning is currently in progress at the prototype fast breeder reactor Monju. Fuel assemblies will be taken out of its core for the first step of the great task. Fuel assemblies stand on their own spike plugged into a socket on the core support plate and support with adjacent assemblies through their housing pads each other, resulting in steady core structure. For this reason, some substitutive assemblies are necessary for the purpose of discharging the fuel assemblies of the core. Monju side commissioned, therefore, Plutonium Fuel Development Center to manufacture the substitutive assemblies and the Center accepted it. This report gives descriptions of design, manufacture, and shipment in regard to the substitutive assemblies.
Sato, Soichi*; Suzuki, Toru*; Hiyama, Toshiaki*; Watanabe, Kazuo
Bunseki, 2005(8), p.451 - 457, 2005/08
no abstracts in English
Sato, Soichi; Suzuki, Toru; Hiyama, Toshiaki; Watanabe, Kazuo*
Bunseki, 2005(8), p.451 - 457, 2005/08
Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.
; ; *; *; *; *
JNC TN9410 99-012, 191 Pages, 1999/07
High current electron beams are required for transforming fission products by gamma-rays. Element technology to efficiently and stably accelerate the high current beam is under development for the accelerator constructed at the quantum technology development facility (QTF). The conceptual design of the accelerator was started in 1989. The test operation of the accelerator was started at a maximum permissible output of 2 kW in January 1999, after many research efforts. In the future, the performance of the accelerator is to be confirmed at a rated output of 200kW. To provide the confirmation, it is important to review and understand basic design conditions of the facility and the accelerator. For this reason, this report shows basic design conditions of the accelerator. In this report, the prerequisites and choices made in the design of the facilities are presented in a tabular form, (1)Electron gun, accelerator, beam dump, klystron, control and data acquisition system. (2)Cooling-water system, air control system and radiation control system. (3)Accelerator facility building. The report contains basic design conditions as of March 1997, when the whole facility was completed. However, certain presented designs were subsequently further modified for a part of the facilities such as the cooling-water system.
Hirano, Koichiro; Nomura, Masahiro; Yamazaki, Yoshio; *; *; *; *
JNC TN9400 99-040, 52 Pages, 1999/05
The development of a high power CW electron linear accelerator was started in 1989 to study the feasibility of nuclear waste transmutation. The accelerator (10MeV, 100mA peak current, 4 ms pulse width, 50 Hz repetition) is dedicated machine for development of the high current acceleration technology in future need. It is necessary to develop the system which controls high power RF in order to stably accelerate the high current beam. Then, We have developed the interlock system for protecting accelerating tube from high current beam in time of trouble of high current beam and high power RF. We have succeeded in the development of the system so as to be able to choose interlock elements corresponding to the operating condition. Using the beam of the low electric power, the synthetic interlock system was tested. The beam was cut off at 3.5
sec, after the interlock operated.
measurement to special nuclear material quantification in fuel debrisShiba, Tomooki; Sagara, Hiroshi*; Hiyama, Toru; Tomikawa, Hirofumi
no journal, ,
In response to the accident at Fukushima Daiichi Nuclear Power Station, passive spectrometry has been researched and developed as one of the candidates of a mass measurement method of the special nuclear materials in molten core material. Among Fission Products (FPs) accompanied in molten core materials, some of them are very low-volatile and emit high-energy rays which enable to derive the mass of those FPs by passive spectrometry. Using the mass ratio between the FPs and nuclear materials, this technique provides the mass estimation of nuclear materials. This technique is relatively simple and was applied to the analysis of nuclear materials in the clean-up process of damaged Three Mile Island unit-2 (TMI-2) reactor. In the poster, we show the outlines of the project, the analytical and experimental results conducted until now, and the future plan of the project.
Sakakibara, Hiroshi; Aoki, Nobuhiro; Muto, Masahiro; Otabe, Jun; Takahashi, Kenji*; Fujita, Naoyuki*; Hiyama, Kazuhiko*; Suzuki, Hirokazu*; Kamogawa, Toshiyuki*; Yokosuka, Toru*; et al.
no journal, ,
no abstracts in English
