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Journal Articles

Voltage drop analysis and leakage suppression design for mineral-insulated cables

Hirota, Noriaki; Shibata, Hiroshi; Takeuchi, Tomoaki; Otsuka, Noriaki; Tsuchiya, Kunihiko

Journal of Nuclear Science and Technology, 57(12), p.1276 - 1286, 2020/12

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

The influence of materials of mineral-insulated (MI) cables on their electrical characteristics upon exposure to high-temperature conditions was examined via a transmission test, in the objective of achieving the stability of the potential distribution along the cable length. Occurrence of a voltage drop along the cable was confirmed for aluminum oxide (Al$$_{2}$$O$$_{3}$$) and magnesium oxide (MgO), as insulating materials of the MI cable. A finite-element method (FEM)-based analysis was performed to evaluate the leakage in the potentials, which was found at the terminal end. Voltage drop yields by the transmission test and the analysis were in good agreement for the MI cable of Al$$_{2}$$O$$_{3}$$ and MgO materials, which suggests the reproducibility of the magnitude relationship of the experimental results via the FEM analysis. To suppress the voltage drop, the same FEM analysis was conducted, the diameter of the core wires ($$d$$) and the distance between them ($$l$$) were varied. Considering the variation of $$d$$, the potential distribution in the MI cable produced a minimum voltage drop corresponding to a ratio $$d/D$$ of 0.35, obtained by dividing $$d$$ with that of the insulating material ($$D$$). In case of varying $$l$$, a minimum voltage drop was l/$$D$$ of 0.5.

Journal Articles

Corrosion property of sheath materials using MI cables at conditions simulated severe accident

Nakano, Hiroko; Shibata, Hiroshi; Takeuchi, Tomoaki; Matsui, Yoshinori; Tsuchiya, Kunihiko

Proceedings of International Conference on Asia-Pacific Conference on Fracture and Strength 2016 (APCFS 2016) (USB Flash Drive), p.283 - 284, 2016/09

no abstracts in English

Journal Articles

Radiation-induced thermoelectric sensitivity in the mineral-insulated cable of magnetic diagnostic coils for ITER

Nishitani, Takeo; Vayakis, G.*; Yamauchi, Michinori*; Sugie, Tatsuo; Kondoh, Takashi; Shikama, Tatsuo*; Ishitsuka, Etsuo; Kawashima, Hisato

Journal of Nuclear Materials, 329-333(Part2), p.1461 - 1465, 2004/08

 Times Cited Count:16 Percentile:72.41(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Performance of joints in the CS model coil and application to the full size ITER coils

Takahashi, Yoshikazu; Yoshida, Kiyoshi; Mitchell, N.*; Bessette, D.*; Nunoya, Yoshihiko; Matsui, Kunihiro; Koizumi, Norikiyo; Isono, Takaaki; Okuno, Kiyoshi

IEEE Transactions on Applied Superconductivity, 14(2), p.1410 - 1413, 2004/06

 Times Cited Count:10 Percentile:49.46(Engineering, Electrical & Electronic)

Cable-in-conduit conductors that consist of about 1,000 Nb$$_{3}$$Sn strands with an outer diameter of about 0.8mm, have been designed for the TF and CS coils of the ITER. The rated current of these coils is 40 -68kA. Two joint types (Butt and Lap) were developed during the CS Model Coil project. The performance of these joints was evaluated during the operating tests and the satisfied results were obtained. The joints of the TF coils are located outside of the winding in a region where the magnetic field is about 2.1T, a very low value as compared to the maximum field of 11.8T at the winding. The CS joints are located at the coil outer diameter and embedded within the winding pack due to the lack of the space. The maximum fields at the CS joint and winding are 3.5 and 13T, respectively. For the TF coils and the CS, the joints are cooled in series with the conductor at the outlet. The maximum temperature increase due to the joule heating in the joints is set at 0.15K to limit the heat load on the refrigerator. It is shown that both joint types are applicable to the ITER coils.

JAEA Reports

Report of the 13th IEA Workshop on Radiation Effects in Ceramic Insulators; December 9, 2003, Kyoto (Cooperative research)

Department of Fusion Engineering Research

JAERI-Review 2004-004, 96 Pages, 2004/03

JAERI-Review-2004-004.pdf:14.47MB

no abstracts in English

JAEA Reports

Study of neutron irradiation effects on mineral insulated cables for fusion reactors (Contract research)

Iida, Toshiyuki*; Tanaka, Teruya*; Sato, Fuminobu*; Ochiai, Kentaro; Nishitani, Takeo

JAERI-Tech 2002-077, 38 Pages, 2002/09

JAERI-Tech-2002-077.pdf:2.7MB

no abstracts in English

Journal Articles

Irradiation effects on magnetic probes made of mineral insulated cable

Nishitani, Takeo; Shikama, Tatsuo*; Fukao, M.*; Matsuo, H.*; Snider, R.*; Broesch, J.*; Sagawa, Hisashi; Kawamura, Hiroshi; Kasai, Satoshi

Fusion Engineering and Design, 51-52(Part.B), p.153 - 158, 2000/11

 Times Cited Count:9 Percentile:55.69(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Analysis of current distribution in multi-strand cable using distributed model circuit

Koizumi, Norikiyo; Takahashi, Yoshikazu; Tsuji, Hiroshi; Shimamoto, Susumu*

Teion Kogaku, 34(8), p.395 - 403, 1999/00

no abstracts in English

Journal Articles

Stability and heat removal characteristics of a cable-in-conduit superconductor for short length and short period perturbation

Koizumi, Norikiyo; Takahashi, Yoshikazu; Okuno, Kiyoshi; Isono, Takaaki; Tsuji, Hiroshi; Nishi, Masataka

Cryogenics, 37(9), p.487 - 495, 1997/00

 Times Cited Count:2 Percentile:17(Thermodynamics)

no abstracts in English

Journal Articles

Ramp-rate limitation due to current imbalance in a large cable-in-conduit conductor consisting of chrome-plated strands

Koizumi, Norikiyo; Takahashi, Yoshikazu; Nishi, Masataka; Isono, Takaaki; Tsuji, Hiroshi; *; *; Fujioka, T.*

Cryogenics, 37(8), p.441 - 452, 1997/00

 Times Cited Count:28 Percentile:78.04(Thermodynamics)

no abstracts in English

Journal Articles

Analysis of the current imbalance in a Large CICC consisting of chrome plated strands

Koizumi, Norikiyo; Takahashi, Yoshikazu; Kato, Takashi; Tsuji, Hiroshi; *; *; *

Proc. of 15th Int. Conf. on Magnet Technology (MT-15), p.453 - 456, 1997/00

no abstracts in English

Journal Articles

Radiation aging and degradation mechanism of polymer insulation for electric cables

*; *; *; Seguchi, Tadao; Yagi, Toshiaki

Proc. of 46th Int. Wire and Cable Symp., p.1 - 5, 1997/00

no abstracts in English

Journal Articles

Development of radiation crosslinking process for high voltage power cable

; Hosoi, Fumio; Hagiwara, Miyuki; ; *; *; *

Radiation Physics and Chemistry, 14(3-6), p.821 - 830, 1979/00

no abstracts in English

Oral presentation

Corrosion properties of sheath materials for MI cables under various gas conditions containing iodine gas

Nakano, Hiroko; Takeuchi, Tomoaki; Hirota, Noriaki; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Research and development of high-heat temperature resistance type mineral insulated cables for severe accident in LWR

Nakano, Hiroko; Takeuchi, Tomoaki; Hirota, Noriaki; Ide, Hiroshi; Hanawa, Masashige*; Tsuchiya, Kunihiko

no journal, , 

Since the accident at the Fukushima Dai-ichi Nuclear Power Plants (NPPs), it has started a research and development which corresponds to the provisions to monitor NPPs situations during a severe accident (SA). Considering that reactor vessel might be exposed to high radiation at high temperature under SA, difficulties may arrear in the measurement of temperature and pressure in the reactor vessel for long time. Thus it is necessary for the measurements of them to develop mineral insulated (MI) cables with radiation- and heat-resistant. In this study, the electric and corrosion properties of the MI cables were evaluated in the conditions that may simulate SA to develop MI cables that can be used even in SA environment. Based on the experiments above, the prospect is obtained that MI cable using nickel alloy as a sheath material can be proposed as a high-temperature MI cable that can be used even in SA environment.

15 (Records 1-15 displayed on this page)
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