ICONE19-43888 NUMERICAL STUDY OF THE TOXIC ELEMENTS DETERMINATION METHOD FOR THE RADIOACTIVE WASTE

2011 ◽  
Vol 2011.19 (0) ◽  
pp. _ICONE1943-_ICONE1943
Author(s):  
Yunfei BAI ◽  
Dezhong WANG ◽  
Cheng LIU
Keyword(s):  
Radioactive Waste ◽  
Toxic Elements ◽  
Numerical Study ◽  
Determination Method

Bonding Material Containing Ashes After Domestic Waste Incineration for Cementation of Radioactive Waste

2007 ◽  
Author(s):  
S. A. Dmitriev ◽  
A. P. Varlakov ◽  
O. A. Gorbunova ◽  
A. E. Arustamov ◽  
A. S. Barinov
Keyword(s):  
Radioactive Waste ◽  
Toxic Elements ◽  
Waste Incineration ◽  
Heat Emission ◽  
Compound Structure ◽  
Domestic Waste ◽  
Bonding Material ◽  
Heat Quantity ◽  
Mineral Additives ◽  
Toxic Industrial Waste

It is known that cement minerals hydration is accompanied with heat emission. Heat of hardening influences formation of a cement compound structure and its properties. It is important to reduce the heat quantity at continuous cementation of waste and filling of compartments of a repository or containers by a cement grout. For reduction of heating, it is necessary to use cement of mineral additives (fuel ashes, slag and hydraulic silica). Properties of ashes after domestic waste incineration can be similar to ones of fly fuel ashes. However, ash after domestic waste incineration is toxic industrial waste as it contains toxic elements (As, Cd, Hg, Pb, Sb, Zn). Utilization of secondary waste (slag and ash) of combustion plants is an important environmental approach to solving cities’ issues. Results of the research have shown that ashes of combustion plants can be used for radioactive waste conditioning. Coprocessing of toxic and radioactive waste is ecologically and economically effective. At SIA “Radon”, experimental batches of cement compositions are used for cementation of oil containing waste.

scholarly journals Johnson–Holmquist-II(JH-2) Constitutive Model for Rock Materials: Parameter Determination and Application in Tunnel Smooth Blasting

2018 ◽  
Vol 8 (9) ◽  
pp. 1675 ◽  
Author(s):  
Jianxiu Wang ◽  
Yao Yin ◽  
Chuanwen Luo
Keyword(s):  
Constitutive Model ◽  
High Pressures ◽  
Numerical Study ◽  
Parameter Determination ◽  
Economic Losses ◽  
Large Strains ◽  
Determination Method ◽  
Rock Materials ◽  
Rock Tunnels ◽  
Smooth Blasting

The Johnson–Holmquist-II(JH-2) model is introduced as the constitutive model for rock materials in tunnel smooth blasting. However, complicated and/or high-cost experiments need to be carried out to obtain the parameters of the JH-2 constitutive model. This study chooses Barre granite as an example to propose a quick and convenient determination method for the parameters of the JH-2 model using a series of computational and extrapolated methods. The validity of the parameters is verified via comparing the results of 3D numerical simulations with laboratory blast-loading experiments. Subsequently, the verified parameter determination method, together with the JH-2 damage constitutive model, is applied in the numerical simulation of smooth blasting in Zigaojian tunnel, Hangzhou–Huangshan high-speed railway. The overbreak/underbreak induced by rock blasting and joints/discontinuities is well estimated through comparing the damage contours resulting from the numerical study with the tunnel profiles measured from the tunnel site. The peak particle velocities (PPVs) of the near field are extracted to estimate the damage scope and damage degree for the surrounding rock mass of the tunnel on the basis of PPV damage criteria. This method can be used in the excavation of rock tunnels subjected to large strains, high strain rates, and high pressures, thereby reducing safety risk and economic losses.

scholarly journals Calorimetric Non-Destructive Assay of Large Volume and Heterogeneous Radioactive Waste Drums

2020 ◽  
Vol 225 ◽  
pp. 06003
Author(s):  
W. R. Kubinski ◽  
C. Carasco ◽  
D. Kikola ◽  
C. Mathonat ◽  
D. Ricard ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Large Volume ◽  
Energy Deposition ◽  
Particle Flux ◽  
Background Radiation ◽  
Numerical Study ◽  
High Energy ◽  
Beta Emitters ◽  
Non Destructive ◽  
Waste Drums

The EU-CHANCE project aims at the issue of the characterization of conditioned radioactive waste (CRW) and one objective of CHANCE is to focus on: Calorimetry as a comprising non-destructive technique to reduce uncertainties on the inventory of radwaste containing shielded and hidden material difficult to be measured by other means. A MCNP6-based numerical study comprising the particle flux out of a 200L mock-up drum in a Large Volume Calorimeter (LVC) currently manufactured by KEP Nuclear (France) will be presented and discussed. For the analyses, the particle flux and energy deposition in each layer of the calorimeter were determined. The results yield that a significant fraction of the radiation would leave the system and not contribute to the measurable heat deposition. The expected energy deposition is obtained and cumulated for each layer over the whole energy range revealing the fraction of particles actually escaping the LVC calorimeter. While this escape fraction needs and can be determined, the LVC is a very suitable apparatus for the anticipated experiments on large and heterogeneous waste drums that possibly contain deeply buried beta-emitters (e.g. Sr/Y-90) or shielded alpha-sources hidden inside the drum with a significant level of gamma and neutron radiation background radiation. The high-energy part of this gamma and neutron flux may even reach the reference chamber of the calorimeter and deposit some energy there, compromising the calibration and may cause a double-bias.

Use of Poisoned Land/Inland Seas for Low Level Radioactive Waste Disposal

1982 ◽  
Vol 15 ◽  
Author(s):  
Douglas G. Brookins ◽  
Herbert A. Vogler ◽  
J. J. Cohen
Keyword(s):  
Heavy Metals ◽  
Radioactive Waste ◽  
Waste Disposal ◽  
Toxic Elements ◽  
Radioactive Waste Disposal ◽  
Basin And Range Province ◽  
The Earth ◽  
Toxic Materials ◽  
High Concentrations ◽  
Low Level Radioactive Waste

It is widely known that certain areas of the earth are characterized by such high concentrations of toxic elements that their use by plants or animals is precluded. A water hole whose water contains potentially toxic quantities of As is a common example of such a naturally poisoned area. The dry salt basins of the Basin and Range Province in Nevada and western Utah are largely relict inland salt seas and, because many of the salt basins have total interior drainage of both surface and ground water, these basins represent unique geochemical environments for the entrapment and concentration of mobile elements. Through leaching, transport, and ultimate deposition from throughout the water shed, the closed salt basins are hydrologic sinks in which toxic materials such as As, Sb, Hg, and other heavy metals become concentrated in a relatively confined area.

Prompt gamma neutron activation analysis of toxic elements in radioactive waste packages

2012 ◽  
Vol 70 (7) ◽  
pp. 1261-1263 ◽  
Author(s):  
J.-L. Ma ◽  
C. Carasco ◽  
B. Perot ◽  
E. Mauerhofer ◽  
J. Kettler ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Radioactive Waste ◽  
Toxic Elements ◽  
Prompt Gamma ◽  
Gamma Neutron Activation

Removal of mercury from water using pottery

2006 ◽  
Vol 94 (1) ◽  
Author(s):  
Abd-Allah A. Helal
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Radioactive Waste ◽  
Water Purification ◽  
Toxic Elements ◽  
Metal Removal ◽  
Low Cost ◽  
Liquid Radioactive Waste ◽  
Heavy Metal Removal ◽  
Immobilization Matrix

SummaryIn a previous study, the sorption of radiocobalt by powdered pottery materials was investigated. The use of these materials as immobilization matrix for liquid radioactive waste requires the employment of pottery vessels. Therefore, the present study aims to give detailed investigations of the decontamination of radionuclides and toxic elements using pottery containers. These investigations are equally useful to elucidate how far these vessels can be utilized for water purification through decontamination of toxic and heavy metals.The radionuclide or heavy metal removal capability using pottery pots, as low cost sorbents, has been investigated for both radioactive (

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