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JAEA Reports

Re-evaluation of a method for monitoring airborne radioiodine discharge and its contribution to development of an advanced method

Koarashi, Jun; Mikami, Satoshi; Miyauchi, Toru; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Nakada, Akira; Akiyama, Kiyomitsu; Momose, Takumaro

JAEA-Technology 2010-039, 34 Pages, 2010/12

JAEA-Technology-2010-039.pdf:1.13MB
JAEA-Technology-2010-039(errata).pdf:0.08MB

The current methodology for monitoring airborne radioiodine at the Tokai reprocessing plant (TRP) was reviewed, and some investigations were made to re-evaluate collection and measurement techniques in the methodology. The investigations focused particularly on: (1) in situ collection efficiency of an iodine sampler for $$^{129}$$I and its dependence on sampling flow rate; (2) evaluation of $$^{129}$$I and $$^{131}$$I activities collected in an activated charcoal cartridge; (3) $$^{129}$$I collection capacity of an activated charcoal cartridge under reprocessing off-gas conditions; and (4) real-time monitoring system for $$^{129}$$I in airborne effluent. The results obtained gave not only the validity of the TRP's monitoring method, but also technical aspects required for establishing a more reliable and effective monitoring method for radioiodine isotopes.

Journal Articles

Recent progress in the energy recovery linac project in Japan

Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.

JAEA Reports

Radioactive airborne effluent discharged from Tokai reprocessing plant; 1998-2007

Nakada, Akira; Miyauchi, Toru; Akiyama, Kiyomitsu; Momose, Takumaro; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Otomo, Hiroyuki*

JAEA-Data/Code 2008-018, 134 Pages, 2008/10

JAEA-Data-Code-2008-018.pdf:3.23MB

This report provides the data set of atmospheric discharges from Tokai reprocessing plant in Tokai-mura, Japan over the period from 1998 to 2007. Daily and weekly data are shown for $$^{85}$$Kr that is continuously monitored and for the other nuclide (Alpha emitters, Beta emitters, $$^{3}$$H, $$^{14}$$C, $$^{129}$$I, $$^{131}$$I) whose activities are evaluated based on weekly batch-samplings, respectively. The data contained in this report are expected to apply for studying the behavior of the radioactive airborne effluent in the environment.

Journal Articles

Performance of the H$$_{p}$$(10) and H$$_{p}$$(0.07) measurable electronic pocket dosimeter for $$gamma$$- and $$beta$$-rays

Takahashi, Masa; Sekiguchi, Masato; Miyauchi, Hideaki; Tachibana, Haruo; Yoshizawa, Michio; Kato, Toru*; Yamaguchi, Akihito*

Journal of Nuclear Science and Technology, 45(Suppl.5), p.225 - 228, 2008/06

 Times Cited Count:1 Percentile:87.16(Nuclear Science & Technology)

Journal Articles

Airborne radioiodine monitoring at Tokai reprocessing plant

Mikami, Satoshi; Koarashi, Jun; Miyauchi, Toru; Akiyama, Kiyomitsu; Kobayashi, Hirohide

Proceedings of 2nd Asian and Oceanic Congress Radiological Protection (AOCRP-2) (CD-ROM), p.308 - 312, 2006/10

As airborne radioiodine effluent monitoring in Tokai reprocessing plant (TRP), not only a weekly evaluation of exact discharged amount of radioiodine ($$^{129}$$I) for assessing environmental impact, but also continuous monitoring of radioiodine being discharged are performed for quick recognition of unexpected effluent tendency. Furthermore, to enhance effluent monitoring activity corresponding to features reprocessing plant, sequential radioiodine monitoring system without interference by the mingled $$^{85}$$Kr has been developed and effectively functioned as an assist during plant operation. The systematic configurations having these functions for airborne radioiodine monitoring corresponding to nuclear fuel reprocessing plant have been established.

Oral presentation

Temporal variation in performance of iodine-129 collecting media for a long-term and large-volume sampling

Miyauchi, Toru; Koarashi, Jun; Mikami, Satoshi; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu

no journal, , 

no abstracts in English

Oral presentation

Airborne radioiodine monitoring technique without interference of Krypton-85 in nuclear fuel reprocessing operation

Mikami, Satoshi; Miyauchi, Toru; Koarashi, Jun; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu

no journal, , 

no abstracts in English

Oral presentation

Airborne radioiodine monitoring in Tokai reprocessing plant

Mikami, Satoshi; Koarashi, Jun; Miyauchi, Toru; Akiyama, Kiyomitsu; Kobayashi, Hirohide

no journal, , 

For airborne radioiodine effluent monitoring in Tokai reprocessing plant (TRP), not only a weekly evaluation of exact discharged amount of radioiodine (I-129) for assessing environmental impact, but also continuous monitoring of radioiodine being discharged are performed for quick recognition of unexpected effluent tendency. Furthermore, to enhance effluent monitoring activity corresponding to features of reprocessing plant, continuous radioiodine monitoring system without interference by the mingled Kr-85 has been developed and effectively functioned as an assist during plant operation. The systematic configurations having these functions for airborne radioiodine monitoring corresponding to nuclear fuel reprocessing plant have been established.

Oral presentation

An Experience of alpha-radioactivity monitoring aiming at $$gamma$$-rays from Am-241 in airborne effluent

Ito, Yasuhisa; Mikami, Satoshi; Miyauchi, Toru; Akiyama, Kiyomitsu; Kobayashi, Hirohide; Kozawa, Tomoyasu*; Yokota, Tomokazu*

no journal, , 

no abstracts in English

Oral presentation

The Emergency safety system of radiation control equipment at the time of all AC-power-supply loss at the Tokai reprocessing plant

Kanazawa, Nobuyuki; Nakamura, Keisuke; Miyauchi, Toru; Chikazawa, Tatsuya*; Kurosawa, Hideaki*; Shiba, Kozo

no journal, , 

no abstracts in English

10 (Records 1-10 displayed on this page)
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