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JAEA Reports

Measurement methods for the radioactive source distribution inside reactor buildings using a one-dimensional optical fiber radiation sensor (Contract research); FY2019 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Nagoya University*

JAEA-Review 2020-063, 44 Pages, 2021/01

JAEA-Review-2020-063.pdf:2.55MB

JAEA/CLADS had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project in FY2019. Among the adopted proposals in FY2019, this report summarizes the research results of the "Measurement methods for the radioactive source distribution inside reactor buildings using a one-dimensional optical fiber radiation sensor" conducted in FY2019.

JAEA Reports

Long-term monitoring of the stability of the gallery in Horonobe Underground Research Laboratory

Aoyagi, Kazuhei; Sakurai, Akitaka; Miyara, Nobukatsu; Sugita, Yutaka

JAEA-Research 2020-004, 68 Pages, 2020/06

JAEA-Research-2020-004.pdf:6.4MB
JAEA-Research-2020-004-appendix1(DVD-ROM).zip:636.84MB
JAEA-Research-2020-004-appendix2(DVD-ROM).zip:457.72MB
JAEA-Research-2020-004-appendix3(DVD-ROM).zip:595.19MB

In construction and operational phase of a high-level radioactive waste disposal project, it is necessary to monitor on mechanical stability of underground facility for long term. In this research, we measured the displacement of the rock around the gallery and the stress acting on support materials. Furthermore, we investigated the durability of measurement sensor installed in the rock mass and the support material such as concreate lining and steel support. As a result, optical fiber sensor is appropriate for measurement of the displacement of rock mass around the gallery, while it is enough to apply the conventional electric sensor for the measurement of stress acting on the support material in the geological environment (soft rock and low inflow). The result of the measurement in the fault zone in 350 m gallery, show that the stresses acting on both shotcrete and steel arch lib exceeded the value which will cause the instability of the gallery. However, as, we found no crack on the surface of the shotcrete. By observation on the surface of shotcrete, thus, it was concluded that careful observation of shotcrete around that section in addition to the monitoring the measured stress was necessary to continue. In other measurement sections, there was no risk for the instability of the gallery as a result of the investigation of the measurement result.

JAEA Reports

Poro-elastic parameter acquisition test using siliceous mudstone (Wakkanai formation)

Aoki, Tomoyuki*; Tani, Takuya*; Sakai, Kazuo*; Koga, Yoshihisa*; Aoyagi, Kazuhei; Ishii, Eiichi

JAEA-Research 2020-002, 83 Pages, 2020/06

JAEA-Research-2020-002.pdf:8.25MB
JAEA-Research-2020-002-appendix(CD-ROM).zip:6.63MB

The Japan Atomic Energy Agency (JAEA) has conducted with the Horonobe Underground Research Project in Horonobe, Teshio-gun, Hokkaido for the purpose of research and development related to geological disposal technology for high-level radioactive wastes in sedimentary soft rocks. The geology around the Horonobe Underground Research Laboratory (HURL) is composed of the Koetoi diatomaceous mudstone layer and the Wakkanai siliceous layer, both of which contain a large amount of diatom fossils. Since these rocks exhibit relatively high porosity but low permeability, it is important to investigate the poro-elastic characteristics of the rock mass. For this objective, it is necessary to measure parameters based on the poro-elastic theory. However, there are few measurement results of the poro-elastic parameters for the geology around HURL, and the characteristics such as dependence on confining pressure are not clearly understood. One of the reasons is that the rocks show low permeability and the pressure control during testing is difficult. Therefore, a poro-elastic parameter measurement test was conducted on the siliceous mudstone of the Wakkanai formation to accumulate measurement results on the poro-elastic parameters and to examine the dependence of the parameters on confining pressure. As a result, some dependency of the poro-elastic parameters on confining pressure was observed. Among the measured or calculated poro-elastic parameters, the drained bulk modulus increased, while the Skempton's pressure coefficient, and the Biot-Wills coefficient in the elastic region decreased with the increase in confining pressure. The measurement results also inferred that the foliation observed in the rock specimens might impact a degree of dependency of those parameters on confining pressure.

Journal Articles

Development of remote sensing technique using radiation resistant optical fibers under high-radiation environment

Ito, Chikara; Naito, Hiroyuki; Ishikawa, Takashi; Ito, Keisuke; Wakaida, Ikuo

JPS Conference Proceedings (Internet), 24, p.011038_1 - 011038_6, 2019/01

A high-radiation resistant optical fiber has been developed in order to investigate the interiors of the reactor pressure vessels and the primary containment vessels at the Fukushima Daiichi Nuclear Power Station. The tentative dose rate in the reactor pressure vessels is assumed to be up to 1 kGy/h. We developed a radiation resistant optical fiber consisting of a 1000 ppm hydroxyl doped pure silica core and 4 % fluorine doped pure silica cladding. We attempted to apply the optical fiber to remote imaging technique by means of fiberscope. The number of core image fibers was increased from 2000 to 22000 for practical use. The transmissive rate of infrared images was not affected after irradiation of 1 MGy. No change in the spatial resolution of the view scope by means of image fiber was noted between pre- and post-irradiation. We confirmed the applicability of the probing system, which consists of a view scope using radiation-resistant optical fibers.

Journal Articles

Laser-induced breakdown spectroscopy and related resonance spectroscopy for nuclear fuel cycle management and for decommissioning of "Fukushima Daiichi Nuclear Power Station"

Wakaida, Ikuo; Oba, Hironori; Miyabe, Masabumi; Akaoka, Katsuaki; Oba, Masaki; Tamura, Koji; Saeki, Morihisa

Kogaku, 48(1), p.13 - 20, 2019/01

By Laser Induced Breakdown Spectroscopy and by related resonance spectroscopy, elemental and isotope analysis of Uranium and Plutonium for nuclear fuel materials and in-situ remote analysis under strong radiation condition for melt downed nuclear fuel debris at damaged core in "Fukushima Daiichi Nuclear Power Station", are introduced and performed as one of the application in atomic energy research field.

Journal Articles

Development of a new fusion power monitor based on activation of flowing water

Verzilov, Y. M.; Nishitani, Takeo; Ochiai, Kentaro; Kutsukake, Chuzo; Abe, Yuichi

Fusion Engineering and Design, 81(8-14), p.1477 - 1483, 2006/02

 Times Cited Count:2 Percentile:18.25(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Laser pattern profile emitted through optical glass fiber bundle with load

Yamauchi, Toshihiko

Japanese Journal of Applied Physics, 43(9A), p.6473 - 6474, 2004/09

 Times Cited Count:0 Percentile:0(Physics, Applied)

The output pattern of He-Ne laser that passes through the optical glass fiber bundle used for free electron laser etc. depends on the weight of load (modulation of transverse mode). The increment of pattern radius exponentially increases with the load. It is considered that the micro bending causes this increment. Next, the estimated delay time also exponentially increases with the weight of load, and the estimated delay time is the extent of pico-second.

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

Development of seal technique for optical fiber; Soldering seal and silver alloy brazing seal

Matsui, Yoshinori; Kikuchi, Taiji; Kakuta, Tsunemi

JAERI-Tech 2002-060, 23 Pages, 2002/08

JAERI-Tech-2002-060.pdf:4.42MB

Recently, the number of in-situ tests using optical fibers as signal transmission lines is increasing in the JMTR, because of their noise-tolerant capability and recent development of irradiation proof type fibers. The convensional seal methods, however, have the problem of trust when they applied to the penetration of the irradiation capsule using optical fibers. As the solution of the problem, we selected soldering seal method that was already applied to the deep-sea optical fiber cables and, as its modification, the silver alloy brazing method. From the result of the out-of-pile test, it was confirmed that both soldering seal and silver alloy brazing seal would be applicable to the plug seal of irradiation capsules. Then the soldering seal was applied to a capsule with optical fibers and was irradiated for 5 operation cycles of the JMTR (about 3000 hours). No deterioration was found at the seal after irradiation. This suggested that in-core use of optical fiber was thought to be promising.

JAEA Reports

Irradiation effects on plasma diagnostic components, 2

Nishitani, Takeo; Shikama, Tatsuo*; Sugie, Tatsuo; Kasai, Satoshi; Ishitsuka, Etsuo; Kawamura, Hiroshi; Kakuta, Tsunemi; Yagi, Toshiaki; Tanaka, Shigeru; Narui, Makoto*; et al.

JAERI-Research 2002-007, 149 Pages, 2002/03

JAERI-Research-2002-007.pdf:8.08MB

no abstracts in English

JAEA Reports

An Investigation of methods for neutron dose measurement in high temperature irradiation fields

Kosako, Toshiso*; Sugiura, Nobuyuki*; Kudo, Kazuhiko*; Mori, Chizuo*; Iimoto, Takeshi*; Shikama, Tatsuo*; Katagiri, Masaki; Hayashi, Kimio; Aihara, Jun; Shibata, Taiju; et al.

JAERI-Review 2000-017, 78 Pages, 2000/10

JAERI-Review-2000-017.pdf:4.62MB

no abstracts in English

Journal Articles

Development of heat and radiation resistant optical fibers

Shikama, Tatsuo*; Ishihara, Masahiro; Hayashi, Kimio; Kakuta, Tsunemi; Shamoto, Naoki*; Ishino, Shiori*

Proceedings of 1st Information Exchange Meeting on Basic Studies on High-Temperature Engineering, p.379 - 386, 1999/09

no abstracts in English

JAEA Reports

Development of multi-channel optical-fiber feed through for ITER

Sugie, Tatsuo; *; Kasai, Satoshi

JAERI-Tech 98-036, 31 Pages, 1998/08

JAERI-Tech-98-036.pdf:2.5MB

no abstracts in English

Journal Articles

Performance of the US quench detection systems in the QUELL experiments

Takahashi, Yoshikazu; S.Pourrahimi*; S.P.Smith*; J.V.Minervini*; J.H.Schultz*; Anghel, A.*; Vecsey, G.*; S.Ezekiel*

IEEE Transactions on Applied Superconductivity, 7(2), p.447 - 450, 1997/06

 Times Cited Count:10 Percentile:61.2(Engineering, Electrical & Electronic)

no abstracts in English

JAEA Reports

Design of divertor impurity monitoring system for ITER

Sugie, Tatsuo; Ogawa, Hiroaki; *; *; Ando, Toshiro; Kasai, Satoshi

JAERI-Tech 96-055, 82 Pages, 1996/12

JAERI-Tech-96-055.pdf:2.07MB

no abstracts in English

Journal Articles

Application of optical fiber system for photoacoustic spectroscopy

Kihara, Takehiro; S.I.Sinkov*; Fujine, Sachio; Maeda, Mitsuru

Value Adding Through Solvent Extraction (Proc. of ISEC 96), 2, p.1603 - 1607, 1996/00

no abstracts in English

JAEA Reports

Study on the photoacoustic spectroscopy capabilities with remote detection for monitoring of actinide species in nuclear fuel reprocessing solutions

S.I.Sinkov*; Kihara, Takehiro; Fujine, Sachio; Maeda, Mitsuru

JAERI-Tech 95-016, 48 Pages, 1995/03

JAERI-Tech-95-016.pdf:1.7MB

no abstracts in English

Journal Articles

Application of multi-capillary fiber to neutron microguide tube

Soyama, Kazuhiko; Minakawa, Nobuaki; *; Kodaira, Tsuneo

Journal of Nuclear Science and Technology, 32(1), p.78 - 80, 1995/01

 Times Cited Count:4 Percentile:51.89(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Development of sensitive analytical technique by laser-induced photoacoustic spectroscopy

Kihara, Takehiro; *; Fujine, Sachio; Maeda, Mitsuru; *; *

JAERI-M 93-234, 47 Pages, 1993/12

JAERI-M-93-234.pdf:1.7MB

no abstracts in English

Journal Articles

Fiber-optics video probes for observation of high-pressure high-temperature two-phase flow

Nakamura, Hideo; Murata, Hideo; Ito, Hideo; Anoda, Yoshinari; Kumamaru, Hiroshige; Kukita, Yutaka

Kashika Joho Gakkai-Shi, 12(47), p.47 - 56, 1992/10

no abstracts in English

32 (Records 1-20 displayed on this page)