Development of training course on non-destructive assay of nuclear material for Asian region, 2; Development of lectures and exercises on gamma-ray measurement

Yamamoto, Masahiko; Kono, Soma; Saegusa, Yu; Kuno, Takehiko; Sekine, Megumi; Inoue, Naoko; Noro, Naoko; Rodriguez, D.; Yamaguchi, Tomoki; Stinett, J.*

Proceedings of INMM & ESARDA Joint Annual Meeting 2023 (Internet), 10 Pages, 2023/05

The gamma-ray measurement part of the Non-Destructive Assay (NDA) course of safeguards and nuclear material accountancy was developed to focus on gamma-ray measurement allotting two days out of five days. The lectures on the basic characteristics and detection methods and mechanism of gamma-ray detectors were provided as e-learnings which were developed. The part for hands-on exercises were implemented in JAEA facility. Participants have set up each gamma-ray detector, and performed measurements of uranium and the other gamma-ray emitting nuclides. Also, uranium-235 enrichment measurements have been performed. In addition, the participants trained with a handheld gamma-ray spectrometer, HM-5, that is popular for IAEA safeguards as the preparation in the measurement exercise of fresh fuel assemblies in JRR-3, a research reactor facility of JAEA. This paper reports on the development, implementation, and feedback from participants on gamma-ray measurement part of the NDA course.

Behavior of carbon-14 in the Tokai reprocessing plant

; ; ; Omori, Eiichi

JNC TN8410 2001-021, 33 Pages, 2001/09

JNC-TN8410-2001-021.pdf:4.37MB

Carbon-14 released from the nuclear facilities is an important radionuclide for the safety assessment, because it tends to accumulate in environment through food chain and has as a significant impact to personal dose. Carbon-14 has been monitored routinely as one of the main gaseous radionuclides exhausted from the Tokai Reprocessing Plant (TRP) since OCtober of 1991. Furthermore, behavior of carbon-14 in TRP has been investigated through the reprocessing operation and the literature survey. This report describes the result of investigation about the behavior of carbon-14 in TRP as followings. (1)Only a very small amount of carbon-14 in the fuel was liberated into the shear off-gas and most of it was liberated into the dissolver of-gass. Part of the carbon-14 was trapped at the caustic scrubber installed in the of-gas treatment process, and untrapped carbon-14 was released into the environment from the main stack. Amount of carbon-14 released from the main stack was about 4.16.5GBq every ton of uranium reprocessed. (2)Carbon-14 trapped at the caustic scrubbers installed in the dissolver off-gas and in the vessel off-gas treatment process is transferred to the low active waste vessel. Amount of carbon-14 transferred to the low active waste vessel was about 5.4 9.6GBq every ton of uranium reprocessed. (3)The total amount of carbon-14 input to TRP was summed up to about 11.915.5 GBq every ton of uranium reprocessed considering the released amount from the main stack and the trapped amount in the off-gas treatment devices. The amount of nitrogen impurity in the initial fuel was calculated about 1522ppm of uranium metal based on the measured carbon-14. (4)The solution in the low active waste vesselis concentrated at the evaporator.Most of the carbon-14 in the solution was transferred into concentrated solution. (5)Tokai vitrification Demonstration Facility (TVF) started to operate in 1994. Since then, carbon-14 has been measured in the ...

Annual report of JMTR, No.9; JMTR operation and technical development April 1, 1994 - March 31, 1995

Department of JMTR

JAERI-Review 95-023, 94 Pages, 1996/02

JAERI-Review-95-023.pdf:4.05MB

no abstracts in English

Annual report of JMTR, 1993

Department of JMTR

JAERI-Review 94-012, 83 Pages, 1994/12

JAERI-Review-94-012.pdf:2.75MB

no abstracts in English

Neutronic analysis on JRR-4 core by the use of low enriched uranium silicide fuels with several uranium densities

Nakano, Yoshihiro

JAERI-M 92-103, 67 Pages, 1992/07

JAERI-M-92-103.pdf:2.05MB

no abstracts in English

Demonstration of NDA and C/S techniques; Basis for NDA measurement

; R.Abedin-Zadeh*; K.Murakami*

3rd Regional Training Course on State Systems of Accounting for and Control of Nuclear Material, 15 Pages, 1991/00

no abstracts in English

Post-irradiation examination of LEU miniplates in the JMTR

; ; *; ; ; ; Okamoto, Yoshizo

ANL-RERTR-TM-9, P. 16, 1988/00

no abstracts in English

Critical Experiment for Power Flattening in Plutonium Fuel Lattice, 1; Measurement of Power Distribution

Murakami, Kiyonobu; ; ; Ono, Akio*; ; *; *; *

JAERI-M 9876, 83 Pages, 1982/01

JAERI-M-9876.pdf:3.09MB

no abstracts in English

Study on Critical Mass of UO Fuel by Calculation with a Transport Code XSDRN

*; ; ; Inabe, Teruo; ; *; ;

JAERI-M 7085, 19 Pages, 1977/05

JAERI-M-7085.pdf:0.7MB

no abstracts in English