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Recycle Experience of Dismantled Cask Handling Crane by Surface Removal Sampling at Kori No. 1.

DE2004827907

Publication Date	2002
Personal Author	Kim, K. D.; Baeg, C. Y.; Son, J. K.; Kim, H. S.; Ha, J. H.; Song, M. J.
Page Count	12
Abstract	The Kori No.1, which began operation in 1978, replaced its cask handling crane in 2000. To prove the safety of recycling and reuse of crane scrap, a particular calculation method for surface contamination was used. Because surface radioactive contamination of steel is limited to a few-microns-thick layer, we can calculate the total (removable and fixed contamination) activity of the sample conservatively by this surface removal sampling means. If we multiply the ratio of total surface and the area of the selected surface by its activity, total activity of the scrap can be estimated. Conservatively, the sampled portion can be used as a representative sample of the scrap. Both the inner and outer part of the scrap was sampled separately, and gamma spectra were analyzed to check whether activation had occurred. Before sampling, the entire surface of the steel is scan surveyed by several kinds of GM and GP detectors. Contaminated parts were segregated, or decontaminated to the background. Almost one sample per one ton of steel was collected. Gamma spectra of 62 samples were analyzed by 100% efficiency HP Ge detector.
Keywords	Spent fuel casks Surface contamination Recycling Radioactive waste disposal Radioactive wastes Gamma spectra Isotopes Mixtures Safety Sampling Scrap Calculation methods Clearance Steels Radioactive waste management
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Nuclear Environment Technology Inst., Daejon (Republic of Korea).; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200509

Recycle Experience of Dismantled Cask Handling Crane by Surface Removal Sampling at Kori No. 1.

Recycle Experience of Dismantled Cask Handling Crane by Surface Removal Sampling at Kori No. 1.
DE2004827907

Publication Date	2002
Personal Author	Kim, K. D.; Baeg, C. Y.; Son, J. K.; Kim, H. S.; Ha, J. H.; Song, M. J.
Page Count	12
Abstract	The Kori No.1, which began operation in 1978, replaced its cask handling crane in 2000. To prove the safety of recycling and reuse of crane scrap, a particular calculation method for surface contamination was used. Because surface radioactive contamination of steel is limited to a few-microns-thick layer, we can calculate the total (removable and fixed contamination) activity of the sample conservatively by this surface removal sampling means. If we multiply the ratio of total surface and the area of the selected surface by its activity, total activity of the scrap can be estimated. Conservatively, the sampled portion can be used as a representative sample of the scrap. Both the inner and outer part of the scrap was sampled separately, and gamma spectra were analyzed to check whether activation had occurred. Before sampling, the entire surface of the steel is scan surveyed by several kinds of GM and GP detectors. Contaminated parts were segregated, or decontaminated to the background. Almost one sample per one ton of steel was collected. Gamma spectra of 62 samples were analyzed by 100% efficiency HP Ge detector.
Keywords	Spent fuel casks Surface contamination Recycling Radioactive waste disposal Radioactive wastes Gamma spectra Isotopes Mixtures Safety Sampling Scrap Calculation methods Clearance Steels Radioactive waste management
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Nuclear Environment Technology Inst., Daejon (Republic of Korea).; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200509