Verification of alternative dew point hygrometer for CV-LRT in Monju

Ichikawa, Shoichi; Chiba, Yusuke; Ono, Fumiyasu; Hatori, Masakazu; Kobayashi, Takanori; Uekura, Ryoichi; Hashiri, Nobuo*; Inuzuka, Taisuke*; Kitano, Hiroshi*; Abe, Hisashi*

JAEA-Research 2016-021, 32 Pages, 2017/02

JAEA-Research-2016-021.pdf:5.0MB

In order to reduce the influence on a plant schedule of the MONJU by the maintenance of dew point hygrometers, The JAEA examined a capacitance type dew point hygrometer as an alternative dew point hygrometer for a lithium-chloride type dew point hygrometer which had been used at the CV-LRT in the MONJU. As a result of comparing a capacitance type dew point hygrometer with a lithium-chloride type dew point hygrometer at the CV-LRT (Atmosphere: nitrogen, Testing time: 24 hours), there weren't significant difference between a capacitance type dew point hygrometer and a lithium-chloride type dew point hygrometer. As a result of comparing a capacitance dew point hygrometer with a high-mirror-surface type dew point hygrometer for long term verification (Atmosphere: air, Testing time: 24 months), the JAEA confirmed that a capacitance type dew point hygrometer satisfied the instrument specification (2.04C) required by the JEAC4203-2008.

Analysis of I by Accelerator Mass Spectrometry (AMS) and its application on earth and environmental sciences

Suzuki, Takashi; Muramatsu, Yasuyuki*

Radioisotopes, 54, p.51 - 53, 2005/00

https://doi.org/10.3769/radioisotopes.54.51

no abstracts in English

Characterization of 50L-scale solidified products yielded by melting treatment of miscellaneous solid wastes and evaluation of radioisotope tracer distribution

Nakashio, Nobuyuki; Nakashima, Mikio; Hirabayashi, Takakuni*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(3), p.279 - 287, 2004/09

https://doi.org/10.3327/taesj2002.3.279

Large-scale melting tests of simulated miscellaneous solid wastes were conducted to characterize solidified products (50L-drum size). Two heating modes were adopted in the tests: hybrid heating and induction heating modes. In the former, wastes were heated with both an induction furnace and a plasma torch, and in the latter, an electrically-conductive crucible was used with the induction furnace. Visual observation, chemical analysis and radioactivity measurements were conducted to the solidified products. It was found that the radioisotope distribution of solidified products was almost homogeneous. There was no remarkable deterioration in the solidified products subsequent to the leaching test.

Adsorption of radionuclides on silica and their uptake by rice plants from silica-maltitracer solutions

Ozaki, Takuo; Ambe, Shizuko*; Abe, Tomoko*; Francis, A. J.

Biological Trace Element Research, 90(1-3), p.273 - 281, 2002/12

https://doi.org/10.1385/BTER:90:1-3:273

no abstracts in English

Present status of FRS of JAERI

Yoshizawa, Michio; Saegusa, Jun; Tanimura, Yoshihiko; Yoshida, Makoto

Proceedings of 14th Meeting of Consultative Committee for Ionizing Radiation, 5 Pages, 2002/00

no abstracts in English

The data analysis of the single well injection-withdraw tracer experiment using the MACRO II

*; Kanazawa, Yasuo*;

JNC TN8400 2001-012, 69 Pages, 2001/04

JNC-TN8400-2001-012.pdf:6.87MB

On understanding the radionuclide transport in natural barrier in radioactive waste isolation research, the macroscopic dispersion in heterogeneous permeability field in the underground rock is regarded as an important process. Therefore, we have conducted lots of tracer experiments by the MACRO II facility with an artificially constructed heterogeneous permeability field. In order to study the scale dependence of dispersion coefficients in case of laboratory experiments, we placed the flow cell horizontally, and conducted injection-withdraw tracer experiment with a single well. We have conducted I5 cases experiments. These cases were prepared by changing a position of single well and the injection-withdraw time. At each position we have conducted 9 cases and 6 cases experiments. In this report, we evaluated the macroscopic dispersion coefficients by the fitting of analytical solution to breakthrough curve measured by the 15 cases pumping tracer experiment. Consequently, we could evaluate the dispersion coefficients for 12 cases of 15 cases. Then, we discussed the relation between a injection-withdraw flow rate and a property of heterogeneous media and dispersion coefficient. The conclusions obtained from the results of the evaluation are summarized as follows, (1)It was found that the macroscopic dispersion coefficients tend to be increased with increase of the average radius of tracer front spread around a single well. (2)We have conducted any experiments with s single well settled at two positions. In case of that there is low permeability around a single well, we found dispersion coefficients are large. In case of that there is high permeability around a single well, we found dispersion coefficients are small. (3)In three cases that we could not evaluate because of incorrect accuracy of fitting, we have found it possible that there is some points that dispersion coefficients were strikingly small in tracer front.

A Development of simulation and analytical program for through-diffusion experiments for a single layer of diffusion media

Sato, Haruo

JNC TN8410 2001-003, 40 Pages, 2001/01

JNC-TN8410-2001-003.pdf:1.13MB

A program (TDROCK1.FOR) for simulation and analysis of through-diffusion experiments for a single layer of diffusion media was developed. This program was made by Pro-Fortran language, which was suitable for scientific and technical calculations, and relatively easy explicit difference method was adopted for an analysis. In the analysis, solute concentration in the tracer cell as a function of time that we could not treat to date can be input and the decrease in the solute concentration as a function of time by diffusion from the tracer cell to the measurement cell, the solute concentration distribution in the porewater of diffusion media and the solute concentration in the measurement cell as a function of time can be calculated. In addition, solution volume in both cells and diameter and thickness of the diffusion media are also variable as an input condition. This simulation program could well explain measured result by simulating solute concentration in the measurement cell as a function of time for case which apparent and effective diffusion coefficients were already known. Based on this, the availability and applicability of this program to actual analysis and simulation were confirmed. This report describes the theoretical treatment for the through-diffusion experiments for a single layer of diffusion media, analytical model, an example of source program and the manual.

Present status of dosimetry for radiation application

Kojima, Takuji

Hoshasen To Sangyo, (89), p.4 - 7, 2001/01

http://ci.nii.ac.jp/naid/40004433181

This paper describes the present status of dosimetry as one of the useful technique for the process/quality control in radiation application and radiation research/testing. It introduces (a)activities in dose standardization of International Organization for Standardization(ISO) and International Atomic Energy Agency(IAEA) on publication of standards and organization of workshops, (b)recent efforts for consistency check in dose evaluation of electrons having energies above 4MeV, and (c)development status of dosimeter systems relevant to new requirements in dosimetry. It also comments on importance of planning for succession of high-dose dosimetry technology and education/training of dosimetry workers/researchers.

Irradiation facilities for calibrating radiation protection instruments in Japan Atomic Energy Research Institute

Murakami, Hiroyuki

Hokeikyo Nyusu, (26), p.2 - 5, 2000/07

http://www.irm.or.jp/news26.pdf

no abstracts in English

Analysis by fracture network modelling

WILLIAM S.DERSHO*; Yoshizoe, Makoto*

JNC TJ8440 2000-001, 408 Pages, 2000/02

JNC-TJ8440-2000-001.pdf:21.62MB

None