Development of high-pressure dry ice blasting method for decontamination (III); Barrel type- and vacuum type- dry ice blasting methods

; ; ; Tanimoto, Kenichi

PNC TN9410 97-061, 73 Pages, 1997/05

PNC-TN9410-97-061.pdf:6.11MB

In order to decrease radioactivity of high-level radioactive wastes to low-level (lower than 500 Sv/h), the dry-ice blasting method has been developing. This method can decontaminate radioactive wastes up to 10 in decontamination factor, and can minimize the secondary generated wastes. However, the method was not applicable to smaller and lighter objects because the objects scatter with the blasting flow. Two types of decontamination method, which are a barrel type- and a vacuum type- dry ice blasting methods, therefore, were planned. The barrel type method can decontaminate smaller solid wastes with preventing the scattering of the wastes by blast pressure. The vacuum type method has advantages to localize and collect the removed contamination from larger wastes. In this work, their basic efficiency on decontamination were investigated experimentally using painted specimens simulating contaminated wastes. Results are as follows. (1)In the experiment on the barrel type method, distance between blast nozzle and specimens, blast pressure, blast duration and rotational speed of barrel were changed within a range of 70250 mm, 715kgf/cm, 90300 second and 530 r.p.m. respectively. Decontamination efficiencies were determined with measuring differential weight of specimens between before and after the experiment. As the result, it was clarified that the suitable distance was 150mm, that the efficiency wasn't improved in the pressure more than 10kg/cm, that the rotational speed was not so dominant, and that the dominant parameter on the efficiency was the duration. The decontamination efficiency rose up with the duration within 300 sec. (2)In the experiment on the vacuum type method, blast pressure and blast duration were changed within a range of 46kgf/cm, and 60180 second, respectively. Top of a vacuum cover was also opened or closed. Decontamination efficiencies were determined with measuring area of ...

Design of an electrostatic magnetic quadrupole accelerator

Mizuno, Makoto; Ohara, Yoshihiro

Review of Scientific Instruments, 64(2), p.477 - 480, 1993/02

https://doi.org/10.1063/1.1144218

no abstracts in English

High heat flux experiment on BC-overlaid C/C composites for plasma facing materials of JT-60U

Nakamura, Kazuyuki; Akiba, Masato; ; ; Dairaku, Masayuki; Ando, Toshiro; *; Saido, Masahiro; Fukaya, Kiyoshi; H.Bolt*; et al.

Journal of Nuclear Materials, 196-198, p.627 - 632, 1992/00

https://doi.org/10.1016/S0022-3115(06)80112-1

no abstracts in English

Election Beam Irradiation Effects on Carbon Fiber Rain Forced PEEK Composite

Sasuga, Tsuneo; Hagiwara, Miyuki; *; *; *; *

JAERI-M 87-048, 29 Pages, 1987/03

JAERI-M-87-048.pdf:1.51MB

no abstracts in English

Effect of Channel Width on Inviscid Flow Past a Bluff Body (Pt.2 Circular Cylinder)

JAERI-M 85-155, 24 Pages, 1985/10

JAERI-M-85-155.pdf:0.6MB

no abstracts in English

Carbon and Titanium Carbide Coating on Molybdenuum Substrate in JT-60 First Wall

Nakamura, H.; ; *; *; *

JAERI-M 85-022, 52 Pages, 1985/03

JAERI-M-85-022.pdf:2.88MB

no abstracts in English

The Characteristics of TiC Coating and Oxidation Resistance and Mechanical Properties of TiC coated Graphite under Corrossive Enviroment

; ; ; *

JAERI-M 82-089, 23 Pages, 1982/07

JAERI-M-82-089.pdf:1.46MB

no abstracts in English

In-situ coating of JFT-2 tokamak

; ; ; ; ;

Shinku, 24(4), p.173 - 177, 1981/00

https://doi.org/10.3131/jvsj.24.173

no abstracts in English