Refine your search:     
Report No.
 - 
Search Results: Records 1-4 displayed on this page of 4
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Separation/removal of steel surface coating film by laser cleaning

Yamane, Ikumi; Takahashi, Nobuo; Sawayama, Kengo; Nishiwaki, Hiroki; Matsumoto, Takashi; Ogawa, Jumpei; Nomura, Mitsuo; Arima, Tatsumi*

JAEA-Technology 2021-038, 18 Pages, 2022/02

JAEA-Technology-2021-038.pdf:1.61MB

We have dismantled uranium enrichment facilities in Ningyo-toge Environmental Engineering Center since their operation finished in 2001, and the total amount of metallic wastes is estimated to be about 130 thousand tons. Eighty percent of them can be disposed as nonradioactive waste (NR), but there are some steel parts possibly uranium-contaminated. We need removing painted surface of such steels and radiologically surveying to dispose them as NRs. Though painted surfaces have been conventionally removed through hand working with grinders, this manual work requires installation of green house, protective clothing, and full-face mask, in order to prevent dispersion and inhalation of airborne dusts. We desire further developments of surface cleaning techniques to reduce time, cost, workload, and secondary waste generation caused by excessive grinding. Therefore, in this study, we focused on the laser cleaning technology used for the separation and removal of paint films at construction sites. In order to improve the coating separation and removal technology for NR objects, we evaluated the coating separation and removal performance of NR steel surface by laser cleaning system, observed the coating scattering behavior by high-speed camera and investigated the coating recovery method, evaluated the laser separation and removal performance of steel surface powder, and thermodynamically evaluated the uranium compounds on steel surface. We additionally evaluated the feasibility of laser cleaning techniques in our works basing on these results, and discussed future work plans for further developments of laser cleaning techniques.

JAEA Reports

Design study of the low level Radioactive waste retrieval facility (II)

Asahina, Kiyoshi*; Soya, Masataka*; Ogawa, Hikaru*; Akasaka, Takayuki*; Iwata, Toshio*; Fukutome, Yutaka*; Nakayama, Jumpei*

PNC TJ4058 89-005, 178 Pages, 1989/06

PNC-TJ4058-89-005.pdf:27.12MB

None

Oral presentation

FP chemistry in a high temperature region of LWR under a severe accident, 2; Analysis of reaction product between Boron vapor species and stainless steel at high temperature

Takase, Gaku; Suzuki, Eriko; Imoto, Jumpei; Nakajima, Kunihisa; Miwa, Shuhei; Ogawa, Hiroaki; Osaka, Masahiko

no journal, , 

A chemical reaction experiment between boron vapor, which is from BWR control material, and stainless steel at high temperature was conducted under the condition in nuclear reactor cooling system during LWR severe accident. It was found from the analysis of reaction products that boron may chemically react with iron at the surface of stainless steel and adhere as Fe-B-O compounds over 940 K.

Oral presentation

Joint Sample Analysis Project on UOC with USA and Kazakhstan; Overview of project and validation of analytical methods on uranium isotope ratio

Matsui, Yoshiki; Kimura, Yoshiki; Ogawa, Jumpei; Umino, Yuji*; Matsumoto, Tetsuya*; Hosoi, Masaharu*; Shinohara, Nobuo

no journal, , 

no abstracts in English

4 (Records 1-4 displayed on this page)
  • 1