scholarly journals On a System Approach to the Selection of Safety Barriers for the Disposal of Radioactive Waste Class 3 and 4

2020 ◽  
Vol 12 (3) ◽  
pp. 54-65
Author(s):  
D. I. Pavlov ◽  
◽  
O. A. Ilina ◽  

The article describes different designs and materials of engineered safety barriers (ESB) for radioactive waste disposal facilities, systematizes the functions and technical specifications of EBS and based on a system approach proposes safety barrier materials and designs for the disposal of radioactive waste class 3 and 4.

2013 ◽  
Vol 284-287 ◽  
pp. 1295-1299
Author(s):  
Mei Ling Chuang ◽  
Wei Hsing Huang

Reactive powder concrete (RPC) has been proposed as barrier materials for the construction of engineered barrier in a low-level radioactive waste disposal site. The durability characteristics of RPC in such applications become paramount for the success of the containment of the wastes. The adverse environmental conditions at the disposal site could attack concrete barrier material and result in degradation of the material. Laboratory tests were conducted on RPC with various compositions to investigate the physical and durability properties of RPC. The effects of the addition of cement, silica fume, quartz powder, silica sand, steel fiber, and 2 levels of water-to-binder ratio (W/B = 0.25 and 0.30) on the properties of RPC specimens were investigated. Experimental results indicate that the long-term durability of RPC is significantly improved with the hydration of pozzolanic materials, which produces a very dense structure and thus exhibiting improved durability. The coefficient of permeability of RPC matrix determined using gas permeability apparatus demonstrated that RPC has much lower permeability than that of ordinary concrete. Heat-treating of concrete at 80°C accelerates the hydration process of RPC and shows enhanced physical and durable characteristics, as demonstrated by the chloride penetration test results.


2021 ◽  
pp. 1-20
Author(s):  
Joanna McFarlane ◽  
Lawrence M. Anovitz ◽  
Michael C. Cheshire ◽  
Victoria H. DiStefano ◽  
Hassina Z. Bilheux ◽  
...  

2013 ◽  
Vol 807-809 ◽  
pp. 1207-1210 ◽  
Author(s):  
Hai Ying Chen ◽  
Chun Ming Zhang ◽  
Shao Wei Wang ◽  
Qiao Feng Liu ◽  
Jing Ru Han

Radioactive waste disposal is one of the most sensitive environmental problems. As the arriving of decommissioning of early period nuclear facilities in China, large amounts of very low-level radioactive waste will be produced inevitably. The domestic and abroad definitions about very low-level radioactive waste and its disposal were introduced, and then siting principles of near surface disposal of very low-level radioactive waste were discussed. The near surface disposal sites’ natural barriers were analyzed from the crustal structure and the radionuclide adsorption characteristics of natural barriers. The near surface disposal sites’ engineering barriers were analyzed from the repository design and the repository barrier materials selection. Finally, the improving direction of very low-level radioactive waste disposal was proposed, which would promote the study of very low-level radioactive waste disposal in China.


2020 ◽  
Vol 21 (1) ◽  
pp. 36-47
Author(s):  
Nikolai S. Pankratov ◽  
Vyacheslav V. Belov

The article deals with the selection of sites for the construction of nuclear installations, radioactive waste disposal sites and other facilities for the use of nuclear energy. The review of modern approaches to the selection of sites for placement of near-surface radioactive waste disposal points shows that the system research in this area is not fully presented, and is mainly aimed at solving problems of an engineering-geological nature for the location area, as well as the choice of materials for engineering protection barriers. In this paper, using the example of radioactive waste disposal sites, we review the requirements set by the regulatory documents of the Russian Federation and the International Atomic Energy Agency in the field of site selection. The authors proposed additions to the methodology for selecting sites for the construction of low-and medium-level waste disposal sites based on the system and GIS analysis of the ALARA principles, as well as the method of weighted evaluation of criteria and their pairwise comparisons. The multi-criteria nature of the site selection problem is proposed to be described by GIS analysis of data with drawing the corresponding limiting and preferred requirements directly on the map of the area, which is shown in the article by the example of selecting sites for radioactive waste disposal points. Taking into account the necessary requirements at various stages of the life cycle, as well as their significance, can be assessed by weighted estimates and pairwise comparisons, followed by their introduction into the GIS analysis. This approach allows to choose rational options for placing potential sites, taking into account the life cycle of the object, in a rational way, with compliance with all necessary regulatory requirements.


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