Irradiation and Temperature Effects on Anti-Foam Agent Performance in a Non-Newtonian Waste Slurry Simulant

2009 ◽  
Author(s):  
Hector N. Guerrero ◽  
Mark D. Fowley ◽  
David J. Sherwood
Keyword(s):  
High Temperature ◽  
Temperature Effects ◽  
Room Temperature ◽  
National Laboratory ◽  
Air Flow ◽  
Savannah River ◽  
Polydimethyl Siloxane ◽  
Air Velocity ◽  
Bench Scale ◽  
Savannah River National Laboratory

Foaming tests were performed in a bench-scale foam column and 1/9th-scale mechanically-agitated mixing system at the Savannah River National Laboratory (SRNL) for a simulant of waste slurry from the Hanford Tank 241-AZ-101. This featured additions of DOW Corning Q2-3183A antifoam agent (AFA) to prevent foaming, especially in the evaporators. These waste slurries (typically 15 wt% solids) are particularly prone to particle-stabilized foaming. Previous studies have shown that up to 20% of the polydimethyl siloxane (PDMS) portion of the AFA mixture is degraded by radiation. The high temperature (90°C) for 48 hrs of a caustic leaching process may have a similar effect on the polymer. The objective of this study was to determine how well degraded AFA works. Key results are that: • Without addition of this AFA, the 1/9th-scale system had about 100% foaming at 1 mm/s air velocity and the bench-scale system had over 400% foaming for an air flow of 10 mm/s. • The effect of irradiating 350 ppm AFA was to increase foaming from 6% to 30% in the foam column and 7.6% to 13.7% in the 1/9th-scale system at an air flow of 1 mm/s at room temperature. • The effect of heating the AFA to 90°C was to increase foaming by a factor of 1.6 in the foam column. But while the effectiveness of the irradiated AFA was reduced, it still provided a significant reduction in foaming. AFA additions required to mitigate the combined effects of high temperature and radiation were also determined.

Preshipment Leak Testing of 9977 Containment Vessels With the TM Electronics Solution Model S1A-L2-V Leak Tester

2010 ◽  
Author(s):  
Donald J. Trapp
Keyword(s):  
Pacific Northwest ◽  
National Laboratory ◽  
Pressure Rise ◽  
Pacific Northwest National Laboratory ◽  
Test Method ◽  
Savannah River ◽  
Leak Test ◽  
Testing Sequence ◽  
Leak Testing ◽  
Savannah River National Laboratory

Pacific Northwest National Laboratory (PNNL) is replacing its 6M nuclear shipping fleet with 9977 shipping packages, which were designed by Savannah River National Laboratory (SRNL). The new packages require PNNL to perform a preshipment leak test on the lid seals of the containment vessel before the package is shipped on public roads. Savannah River National Laboratory (SRNL) developed a preshipment leak test using a TM Electronics Solution leak tester for PNNL. The Solution is an automatic vacuum leak tester that uses the Gas Pressure Rise leak test method to check the O-ring lid seals and the test port plug seal. The two tests take three minutes each to perform. Because the Solution is fully automatic, the leak test can be done by operators after a few hours of training. This paper describes the test equipment and the testing sequence.

scholarly journals Thermal Aspects of Safety Analysis for Shipment of West Valley Melter

2017 ◽  
Author(s):  
James E. Laurinat ◽  
Matthew R. Kesterson ◽  
Jeffery L. England ◽  
Edward T. Ketusky ◽  
Charles A. McKeel ◽  
...  
Keyword(s):  
National Laboratory ◽  
Safety Analysis ◽  
Department Of Energy ◽  
Savannah River ◽  
The West ◽  
Heating Source ◽  
Savannah River National Laboratory ◽  
Set Up ◽  
High Level ◽  
Cellular Concrete

The thermal aspects of a safety analysis for shipment of the West Valley melter are presented. The West Valley melter was used from 1996 to 2002 to vitrify regionally sourced high level radioactive waste. The U.S. Department of Energy (DOE) set up the West Valley Demonstration Project to encase this melter and grout it in low density cellular concrete, for disposal. DOE-West Valley requested the Savannah River National Laboratory to prepare a Safety Analysis Report. The thermal portion of the safety analysis covers Normal Conditions of Transport (NCT) and Hypothetical Accidents Conditions (HAC), as defined in the Code of Federal Regulations. For NCT, it is assumed that the encased melter is stored in either shade or direct sunlight at an ambient temperature of 311 K (100 °F). The defining HAC is exposure to a 1075 K (1475 °F) fire for 30 minutes. Finite element computer models were used to compute temperature profiles for NCT and HAC, given the thermal properties of the melter and its contents and tabulated radiolytic heating source concentrations. The resulting temperature conditions were used to estimate the pressurization due to evaporation of water from the concrete. The maximum calculated gauge pressures were determined to be 81 kPa (12 psig) for NCT and 580 kPa (84 psig) for HAC.

CFD Modeling of Solid Fluidization in a Column

2005 ◽  
Author(s):  
Si Y. Lee
Keyword(s):  
National Laboratory ◽  
Primary Objective ◽  
Cfd Modeling ◽  
Savannah River ◽  
Hydraulic Behavior ◽  
Savannah River National Laboratory ◽  
Computational Fluid Dynamics Cfd ◽  
Pass Through ◽  
River Site ◽  
Sedimentation Processes

Primary objective of the work is to model resin particles within the column during the particle fluidization and sedimentation processes and to understand hydraulic behavior for particles within column during the resin fluidization and sedimentation processes. The modeling results will assist in interpreting experimental results, providing guidance on specific details of testing design, and establishing a basic understanding of resin particle’s hydraulic behavior within the column. The model was benchmarked against the literature data and the test data conducted by Savannah River National Laboratory at Savannah River Site (SRS). A scoping analysis effort has been undertaken to address the feasibility of simulating the basic fluidization and sedimentation aspects pertinent to the resin addition/removal process considered here. The existing computational fluid dynamics (CFD) code Fluent was chosen for this effort. Both fluidization and sedimentation of granular particles (i.e., of varying sizes) were based on an Eulerian model for granular flow. A two-dimensional axial symmetrical cylindrical geometry was chosen to perform the solid-fluid simulations. The column consisted of a fluid region of 48” in diameter by 94” in height where at both the top and bottom boundaries liquid fluid could pass through, but resin particle could not (i.e., assuming screens at both ends).

scholarly journals Hydrogen Concentrations During Storage of 3013 Oxide Samples

2011 ◽  
Author(s):  
N. M. Askew ◽  
J. E. Laurinat ◽  
S. J. Hensel
Keyword(s):  
National Laboratory ◽  
Hydrogen Gas ◽  
Surveillance Program ◽  
Nuclear Materials ◽  
Savannah River ◽  
Shipping Containers ◽  
Savannah River National Laboratory ◽  
Hydrogen Accumulation ◽  
Lower Flammability Limit ◽  
River Site

As part of a surveillance program intended to ensure the safe storage of plutonium bearing nuclear materials in the Savannah River Site (SRS) K-Area Materials Storage, samples of these materials are shipped to Savannah River National Laboratory (SRNL) for analysis. These samples are in the form of solids or powders which will have absorbed moisture. Potentially flammable hydrogen gas is generated due to radiolysis of the moisture. The samples are shipped for processing after chemical analysis. To preclude the possibility of a hydrogen deflagration or detonation inside the shipping containers, the shipping times are limited to ensure that hydrogen concentration in the vapor space of every layer of confinement is below the lower flammability limit of 4 volume percent (vol%) [1]. This study presents an analysis of the rate of hydrogen accumulation due to radiolysis and calculation of allowable shipping times for typical K-Area materials.

scholarly journals Analysis of Thermally Controlled Poultry Housing Using CFD

2020 ◽  
pp. 40-48
Author(s):  
T. O. Tehinse ◽  
F. R. Falayi ◽  
T. O. Aduewa ◽  
M. O. Alatise ◽  
B. I. Osho
Keyword(s):  
Room Temperature ◽  
Solid Wall ◽  
Air Flow ◽  
Critical Time ◽  
Pressure Profile ◽  
Housing System ◽  
Data Logger ◽  
Air Velocity ◽  
External Temperature ◽  
Temperature Levels

Poultry industry’s development in the past two decades and the need for increased animal protein sources in the hot regions of the world, require the need to develop housing system that is thermally controlled for optimal production. The research was carried out at Federal University of Technology Akure, Ondo State, Nigeria. The facility consisted of a broiler house of 6 rooms enclosed by masonry sidewalls at the base and insulated plywood at the upper section of the house with each experimental room equipped with blower, suction fan and heater. The data were monitored at the most critical time of the day – 1 pm during the dry season. Experimental data were recorded using developed and calibrated data logger. The 5 experimental rooms are programed to 5 temperature levels (41, 38, 35, 32 and 29°C) characterizing extreme heat boundary conditions for broilers with fans programmed at 1.5 m/s air velocity. The aim of this study is to evaluate the thermal distribution in solid-wall broiler houses using computational fluid dynamics (CFD). The CFD technique allows visualizing air flow according to different running condition for each room for exhaust fans, as well as other parameters. The simulation was used to determine the air temperature variation, inner wall temperature, external temperature, air velocity distribution, external wall heat flux, pressure and wall heat transfer coefficient in all the experimental rooms of poultry house. The simulated air flow pattern and temperature distribution in the experimental rooms were analyzed and the result revealed increase room temperature as the preset room temperature increases. However, the velocity profile in all the room shows buildup of air at the outlet vent due to turbulence created by the suction fans. The pressure profile across the rooms was relatively the same.

Sign in / Sign up

Export Citation Format

Share Document