Metal scrap is a major waste generated from the decommissioning of nuclear facilities. Through a decontamination process, most of the metal scraps can be cleaned to meet the clearance levels, which can then be reused or released according to the regulatory procedure. Usually, chemical processes will be used in the cleaning step. Phosphoric acid and fluoroboric acid are the typical chemicals used for decontamination. Although the decontaminant could be reused multiple times after regeneration, its decontamination efficiency would decrease after 3 to 5 cycles. In addition, the radioactive nuclides such as Cs-137 are not easily removed during the regeneration process; it tends to accumulate slowly in the decontaminant. According to the ALARA principle, decontaminant must be replaced if its radioactive activity exceeds the regulatory levels. As a result, a significant amount of spent strong acid solution would be generated. The conventional way of treatment is to neutralize the acid solution with an alkaline solution. However, such method will produce a large amount of sludge that requires further stabilization, which offsets the advantages of metal decontamination by use of the decontaminant. A high-efficiency solidification method has been developed and used to treat the spent phosphoric acid and fluoroboric acid solution in Institute of Nuclear Energy Research (INER). The self-polymerization nature of highly concentrated phosphoric acid is adopted to immobilize the radioactive nuclides. The volume of solidified form is almost equal to that of the treated acid solution. The waste form demonstrates its quality by compression test and leaching test. This cementation process is an excellent method to minimize the secondary waste, which is generated from chemical decontamination for treating metal waste.
Skip Nav Destination
ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management
September 25–29, 2011
Reims, France
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5498-3
PROCEEDINGS PAPER
Treatment of Spent Acidic Decontaminants With a High-Efficiency Cementation Method
Kou-Ming Lin,
Kou-Ming Lin
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Ching-Tu Chang,
Ching-Tu Chang
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Ming-Shin Wu,
Ming-Shin Wu
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Wen-Chen Lee,
Wen-Chen Lee
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Jen-Chieh Chung,
Jen-Chieh Chung
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Tsong-Yang Wei
Tsong-Yang Wei
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Search for other works by this author on:
Kou-Ming Lin
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Ching-Tu Chang
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Ming-Shin Wu
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Wen-Chen Lee
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Jen-Chieh Chung
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Tsong-Yang Wei
Institute of Nuclear Energy Research, Lungtan, Taoyuan, Taiwan
Paper No:
ICEM2011-59063, pp. 1521-1524; 4 pages
Published Online:
August 17, 2012
Citation
Lin, K, Chang, C, Wu, M, Lee, W, Chung, J, & Wei, T. "Treatment of Spent Acidic Decontaminants With a High-Efficiency Cementation Method." Proceedings of the ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Reims, France. September 25–29, 2011. pp. 1521-1524. ASME. https://doi.org/10.1115/ICEM2011-59063
Download citation file:
13
Views
Related Proceedings Papers
Related Articles
Handling and Conditioning Techniques of Activated Swarfs for the Decommissioning of the E. Fermi Nuclear Power Plant
ASME J of Nuclear Rad Sci (April,2018)
Mold Surface Wavelength Effect on Gap Nucleation in Solidification
J. Appl. Mech (March,2000)
Critical Wavelengths for Gap Nucleation in Solidification— Part I: Theoretical Methodology
J. Appl. Mech (March,2000)
Related Chapters
Dismantling
Decommissioning Handbook
NRC Requirements for Decommissioning
Decommissioning Handbook
Characterization
Decommissioning Handbook