Measures of closing report of outside waste storage pits

; Ishibashi, Yuzo; Yoshida, Michihiro; Miyo, Hiroaki; Sukegawa, Yasuhiro*; *; Suzuki, Satoshi*

JNC TN8440 2000-020, 500 Pages, 2000/10

JNC-TN8440-2000-020.pdf:25.91MB

At outside waste storage pits, containers for storage of wastes corroded and were flooded, and it was confirmed on August 26, 1997. Confirmation of contamination of the pits outskirts, installation of sheets to prevent rainwater from flowing into the pits, drawing stay water were executed, promptly. Design and authorization works of the work house and waste treatment devices to take out wastes of the pits were executed too. After construction of the work house, taking out wastes of the pits started, and finished on April 10, 1998. Investigations of the inflow point of rainwater and leak of stay water were executed next. The results were reported to Science and Thechnology Agency (STA), adjoining authorities on December 21, 1998. After decontamination of the pits inner walls to background level of the radioactivity which included general concrete, control area was removed, and the pits were closed by concrete. Measures of closing of the pits were prepared from the middle of August, 1999, and dismantlement of unnecessary instruments started. Decontamination of the pits started from the begining of September, 1999. The above works finished on June 30, 2000. After decontamination of the pits, STA, adjoining authorities confirmed the circumstances. Work pouring concrete into the pits was executed three times (three levels), and finished on August 31, 2000. In addition t0 above, the amount of concrete poured into the pits was about 1,200 m.

None

; ; Ishibashi, Yuzo; Takeda, Seiichiro; *; Fujisaku, Kazuhiko*; *

PNC TN8410 98-116, 147 Pages, 1998/08

PNC-TN8410-98-116.pdf:8.42MB

None

None

; ; Fujisaku, Kazuhiko*; Ishibashi, Yuzo; Takeda, Seiichiro

PNC TN8410 98-060, 74 Pages, 1998/03

PNC-TN8410-98-060.pdf:4.25MB

None

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Kato, Toshihiro*; ; ; ; Ishibashi, Yuzo; Takeda, Seiichiro

PNC TN8410 98-070, 31 Pages, 1998/02

PNC-TN8410-98-070.pdf:0.99MB

None

Development of remote dismantling and removal of large components in Reprocessing Plant

Ishibashi, Yuzo; Kawata, Tomio; Tanaka, Yasumasa; ;

Proceedings of 3rd International Conference on Nuclear Engineering (ICONE-3), p.0 - 0, 1995/00

None

None

Ishibashi, Yuzo; Tanaka, Yasumasa; ; ; Kawata, Tomio

3rd International Conferece on Nuclear Engi, , 

None

None

Ishibashi, Yuzo; ; ; ;

Donen Giho, , 

None

Development of nondestructive measurement techniques for uranium-contaminated waste; Measurement of uranium-contaminated wastes in drum

Oki, Koichi; Omori, Koji; Ishibashi, Yuzo; Muto, Katsumi; Sukegawa, Yasuhiro*; Suzuki, Satoshi*

no journal, , 

no abstracts in English