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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.

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.

JAEA Reports

Re-Evaluation of a Method for Monitoring Airborne$$^{14}$$C Discharge and its Contribution to Development of an Advanced Method

Koarashi, Jun; Isaka, Keisuke*; Yokota, Tomokazu*; Kozawa, Tomoyasu*; Mikami, Satoshi; Kiyomitsu, Akiyama,; Kobayashi, Hirohide

JNC-TN8410 2005-005, 55 Pages, 2005/05

JNC-TN8410-2005-005.pdf:2.0MB

Some investigations were made for re-evaluating collection and measurement techniques in an airborne $$^{14}$$C discharge monitoring at the Tokai reprocessing plant (TRP), which include (1)collection efficiency of CO$$_{2}$$ in a carbon sampler using monoethanolamine as CO$$_{2}$$ absorbent;(2)affect of incorporating tritiated water into the carbon sampler on quantitative estimation of $$^{14}$$C activity in airborne effluent; (3)affect of leakage in air sampling on evaluating airborne $$^{14}$$C discharge; and (4)determination of chemical forms of $$^{14}$$C in airborne release from the TRP. The results presented not only the validity of the TRP's monitoring method, but also the technical aspects required for establishing a more reliable and effective monitoring method.

JAEA Reports

Re-Evaluation of a Method for Monitoring Airborne$$^{3}$$H Discharge and its Contribution to Development of an Advanced Method

Koarashi, Jun; Yokota, Tomokazu*; Kozawa, Tomoyasu*; Isaka, Keisuke*; Mikami, Satoshi; Kiyomitsu, Akiyama,; Kobayashi, Hirohide

JNC-TN8410 2005-004, 73 Pages, 2005/05

JNC-TN8410-2005-004.pdf:2.48MB

Some investigations were made for re-evaluating collection and measurement techniques in an airborn $$^{3}$$H discharge monitoring at the Tokai reprocessing plant (TRP), which include (1)collection efficiency of water in a tritium sampler; (2)quench correction in $$^{3}$$H activity measurement by liquid scintillation counting; (3)affect of leakage in air sampling on evaluating airborne $$^{3}$$H discharge; and (4)determination of chemical forms of $$^{3}$$H in airborne release from the TRP. The results presented not only the validity of the TRP's monitoring method, but also the technical aspects required for establishing a more reliable and effective monitoring method.

JAEA Reports

Methods and Their Performances for Collecting Tritium, Carbon-14 and Radioiodine in Airborne Effluent from Tokai Reprocessing Plant

Koarashi, Jun; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Kiyomitsu, Akiyama,; Asano, Tomohiro

JNC-TN8410 2004-003, 49 Pages, 2004/07

JNC-TN8410-2004-003.pdf:1.45MB

Radioactive airborne effluent discharged from Tokai reprocessing plant (TRP) contains tritium, carbon-14 and radioiodine. These radionuclides are collected with appropriate methods, respectively, in stacks to monitor their concentrations and discharged amounts. This report describes (1) the methods for collecting these radionuclides in TRP; (2) evaluations of the concentrations and discharged amounts; and (3) investigations on estimating performances of the collecting methods. The investigations showed that the collecting methods used in TRP have collecting efficiencies of more than 90% for tritium and radioiodine, and almost 100% for carbon-14. Considerations concerning collection of radionuclides in airborne effluent, made in this study, provided some technical aspects required for establishing more reliable monitoring systems.

JAEA Reports

Chemical forms and discharge ratios to stack and sea of Tritium from Tokai reprocessing plant

Mikami, Satoshi; *; *; Kozawa, Tomoyasu*; *; *

JNC-TN8410 2002-005, 32 Pages, 2002/03

JNC-TN8410-2002-005.pdf:13.32MB

Chemical forms and discharge ratios to stack and sea of tritium from Tokai Reprocessing Plant of Japan Nuclear Cycle Development Institute (JNC) were investigated by analyzing monitoring data. It was ascertained that approximately 70-80% of tritium discharged from the main stack was tritiated water vapor (HTO) and approximately 20-30% was tritiated hydrogen (HT) as a result of analyzing the data taken from reprocessing campaigns in 1994, 1995, 1996, 1997, 2000 and 2001, and also that the amount of tritium released from the stack was less than 1% of tritium inventory in spent fuel and the amount of tritium released into sea was approximately 20-40% of inventory.

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

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

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