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Journal Articles

Stability test of RHQT Nb$$_{3}$$Al cable-in-conduit conductor

Koizumi, Norikiyo; Matsui, Kunihiro; Hemmi, Tsutomu; Nakajima, Hideo; Takeuchi, Takao*; Banno, Nobuya*; Kikuchi, Akihiro*

Teion Kogaku, 46(8), p.495 - 499, 2011/08

JAEA and NIMS has been collaborating in development of high performance Rapid-Heating-Quenching-Transformation (RHQT) Nb$$_{3}$$Al CIC conductor, aiming at the application of this conductor to DEMO plant. The technical issue of the RHQT Nb$$_{3}$$Al strand in the application to a fusion magnet is stabilization against perturbation. NIMS developed technique to attach copper stabilizer by using electroplating and a sub-scale CIC conductor is developed using this conductor. JAEA performed stability test of the developed CIC conductor to demonstrate efficiency of this copper stabilization technique. The measured stability margin is sufficiently high compared to the one of similar NbTi CIC conductor previously tested by the authors. Then, it can be concluded that the copper stabilizer works efficiently from view point of stability, resulting in solving the remained technical issues in the RHQT CIC conductor. Therefore, we can say that the RHQT Nb$$_{3}$$Al CIC conductor is the most promising candidate for application to magnet in DEMO plant.

JAEA Reports

Examination of a distributed small reactor system with the social acceptability; The District heat supply small reactor system using deep underground cave

Nakajima, Nobuya; Takahashi, Hiroki; Kusunoki, Tsuyoshi; Mitomo, Nobuo

JAERI-Tech 2005-057, 54 Pages, 2005/09

JAERI-Tech-2005-057.pdf:4.27MB

Availability using small reactor sited in deep underground cave was examined as a district heat supply system.From the viewpoint of a social acceptability, the contact points with a distributed small reactor system were examined to resolve a social structure-subject of a big city through investigation of the city environmental issue and city calamity. In order to estimate the scale of the heat source of a district heat supply system, a virtual city model was set up about 100,000 populations. It became clear that the heat can be supplied by installing two reactors with thermal-power 100MWt (MR-100G) in caves. Moreover, it turns out that the system will also function effectively for more than 40 years. The economic efficiency of this system was compared with the natural-gas boiler, and we confirmed that the district heat supply system by the small reactor is excellent especially for the case of long-term system operation.

JAEA Reports

Report of Horonobe technical review meetings (FY 2004); 1st to 4th meetings (Document on present state of affairs)

Shirato, Nobuaki*; Matsui, Hiroya; Morioka, Hiroshi; Hatanaka, Koichiro; Takeuchi, Ryuji; Hatakeyama, Nobuya; Ohara, Hidefumi; Nakajima, Takahiro; Kunitomo, Takahiro

JNC TN5440 2005-001, 412 Pages, 2005/06

JNC-TN5440-2005-001.pdf:20.87MB

We held Horonobe technical review meeting 4 times a year. The first meeting is for the plan of Horonobe underground research laboratory and others. The secound meeting is for geology of Horonobe area and modeling study and data acquisition for safety assessment methodology and others. The third meeting is for ventilation network analyses on URL plan. The fourth meeting is for the remote monitoring system using ACROSS. This report is records of these meetings.

JAEA Reports

Study on the thermal output scale of a very small reactor for district-heat-and-cooling system

Takahashi, Hiroki; Nakajima, Nobuya; Kusunoki, Tsuyoshi

JAERI-Tech 2003-052, 59 Pages, 2003/06

JAERI-Tech-2003-052.pdf:5.95MB

The feasibility study of a distributed small reactor system has been performed in JAERI for the utilization of the heat source for public welfare, especially for air-conditioning and hot water supply, from the view point of use expansion of nuclear energy. In this report, the optimization of heat supply system including the set up and analysis of the model city are studied for the prediction of short and long term heat demand in the heat supply area. It is important process for understanding the whole system image to estimate the suitable heat source scale for the heat demand of the heat supply area, which is within a 5-km radius from heat supply source. From the analysis, it is clear that two or more set of the nuclear reactors based on 100 MW thermal power are suitable. Furthermore, it is indicated that the introduced reactor system can be utilized for more than 30 year and the heat reserve system is indispensable. This results show the feasibility of a small reactor system for district heat-and cooling supply.

Journal Articles

Design study of a district-heating reactor installed in the basement of building

Kusunoki, Tsuyoshi; Odano, Naoteru; Nakajima, Nobuya; Fukuhara, Yoshifumi*; Ochiai, Masaaki

Nihon Genshiryoku Gakkai-Shi, 42(11), p.1195 - 1203, 2000/11

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Research and development on very small reactor for heat supply

Nakajima, Nobuya; Kusunoki, Tsuyoshi; Odano, Naoteru; Ochiai, Masaaki

Dai-7-Kai Doryoku Enerugi Gijutsu Shimpojiumu Koen Rombunshu (00-11), p.225 - 228, 2000/00

no abstracts in English

Journal Articles

A Nuclear reactor installed in the basement of a building for heat supply

Kusunoki, Tsuyoshi; Odano, Naoteru; Yoritsune, Tsutomu; Fukuhara, Yoshifumi*; Nakajima, Nobuya; Ochiai, Masaaki

Proceedings of the 4th JSME-KSME Thermal Engineering Conference, p.1_61 - 1_66, 2000/00

no abstracts in English

JAEA Reports

Workshop summary report on the advanced utilization of plutonium in water cooled reactor; March 2nd, 1999, in Tokyo

Nakajima, Nobuya; Ochiai, Masaaki

JAERI-Conf 99-014, p.218 - 0, 1999/12

JAERI-Conf-99-014.pdf:11.65MB

no abstracts in English

Oral presentation

Stability test results of RHQT Nb$$_{3}$$Al CIC conductor

Koizumi, Norikiyo; Matsui, Kunihiro; Nakajima, Hideo; Takeuchi, Takao*; Banno, Nobuya*

no journal, , 

no abstracts in English

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