scholarly journals Lawrence Livermore National Laboratory and Sandia National Laboratory Nuclear Accident Dosimetry Support of IER 252 and the Dose Characterization of the Flattop Reactor at the DAF

2017 ◽  
Author(s):  
D. P. Hickman ◽  
K. L. Jeffers ◽  
R. P. Radev ◽  
L. I. Tai ◽  
D. C. Ward ◽  
...  
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Sandia National Laboratory ◽  
Nuclear Accident

Characterization of the Corrosion Behavior of Alloy 22 after Five Years Immersion in Multi-ionic Solutions

2002 ◽  
Vol 757 ◽  
Author(s):  
Lana L. Wong ◽  
David V. Fix ◽  
John C. Estill ◽  
R. Daniel McCright ◽  
Raúl B. Rebak
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Electrolyte Solutions ◽  
Underground Water ◽  
Localized Corrosion ◽  
General Corrosion ◽  
Uniform Corrosion ◽  
Waste Container ◽  
Alloy 22

ABSTRACTAlloy 22 (N06022) is the candidate material for the corrosion resistant, outer barrier of the nuclear waste container. Two of the potential corrosion degradation modes of the container are uniform corrosion and localized corrosion. A testing program is under way at the Lawrence Livermore National Laboratory to determine the susceptibility of Alloy 22 to these two forms of corrosion using immersion tests. Metallic coupons are being exposed to several electrolyte solutions simulating concentrated underground water from pH 3 to 10 at 60°C and 90°C. This paper describes the results obtained after more than a five-year exposure of 122 specimens to the testing electrolyte solutions. Results show little general corrosion and the absence of localized corrosion. The maximum general corrosion rate was 23 nm/yr.

scholarly journals Lawrence Livermore National Laboratory's activities to achieve ignition by X-ray drive on the National Ignition Facility

1999 ◽  
Vol 17 (2) ◽  
pp. 159-171 ◽  
Author(s):  
J.D. KILKENNY ◽  
T.P. BERNAT ◽  
B.A. HAMMEL ◽  
R.L. KAUFFMAN ◽  
O.L. LANDEN ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Sandia National Laboratory ◽  
Department Of Energy ◽  
Naval Research ◽  
Inertial Confinement ◽  
National Ignition Facility ◽  
X Ray ◽  
Omega Laser

The National Ignition Facility (NIF) is a MJ-class glass laser-based facility funded by the Department of Energy which has achieved thermonuclear ignition and moderate gain as one of its main objectives. In the summer of 1998, the project was about 40% complete, and design and construction was on schedule and on cost. The NIF will start firing onto targets in 2001, and will achieve full energy in 2004. The Lawrence Livermore National Laboratory (LLNL) together with the Los Alamos National Laboratory (LANL) have the main responsibility for achieving X-ray driven ignition on the NIF. In the 1990s, a comprehensive series of experiments on Nova at LLNL, followed by recent experiments on the Omega laser at the University of Rochester, demonstrated confidence in understanding the physics of X-ray drive implosions. The same physics at equivalent scales is used in calculations to predict target performance on the NIF, giving credence to calculations of ignition on the NIF. An integrated program of work in preparing the NIF for X-ray driven ignition in about 2007, and the key issues being addressed on the current Inertial Confinement Fusion (ICF) facilities [(Nova, Omega, Z at Sandia National Laboratory (SNL) and NIKE at the Naval Research Laboratory (NRL)], are described.

scholarly journals Characterization Of Physically Vapor Deposited Af2400 Thin Films

1993 ◽  
Vol 328 ◽  
Author(s):  
R. Chow ◽  
M. K. Spragge ◽  
G. E. Loomis ◽  
F. Rainer ◽  
R. L. Ward ◽  
...  
Keyword(s):  
Refractive Index ◽  
Morphological Changes ◽  
Amorphous Polymer ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Fused Silica ◽  
Deposition Parameters ◽  
Temperature Scanning ◽  
Normal Laboratory

ABSTRACTAnti-reflective optical coatings made with Teflon AF2400 had the highest laser damage thresholds recorded for physical vapor deposited coatings at the Lawrence Livermore National Laboratory damage facility. Physical vapor deposited layers of Teflon AF2400, a perfluorinated amorphous polymer, Maintained the bulk optical properties of a high transmittance from 200 nm to 1200 nm, and a low refractive index. In addition, the refractive index can be intentionally reduced by control of two common deposition parameters, deposition rate and substrate temperature. Scanning electron microscopy and nuclear magnetic resonance observations indicated that morphological changes caused the variations in the refractive index rather than compositional changes. The coatings adhered to fused silica and silicon wafers under normal laboratory handling conditions.

A Reduced Diesel Surrogate Mechanism for Compression Ignition Engine Applications

2012 ◽  
Author(s):  
Mandhapati Raju ◽  
Mingjie Wang ◽  
P. K. Senecal ◽  
Sibendu Som ◽  
Douglas E. Longman
Keyword(s):  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Sandia National Laboratory ◽  
Computational Time ◽  
Zone Model ◽  
Compression Ignition ◽  
Ambient Conditions ◽  
Compression Ignition Engine ◽  
Detailed Mechanism ◽  
Skeletal Mechanism

A skeletal mechanism with 117 species and 472 reactions for a Diesel surrogate i.e., n-heptane, was developed. The detailed mechanism for n-heptane created by Lawrence Livermore National Laboratory (LLNL) was employed as the starting mechanism. The detailed mechanism was then reduced with an enhancement of the Direct Relation Graph (DRG) technique called Parallel DRG-with Error Propagation and Sensitivity Analysis (PDRGEPSA). The reduction was performed for pressures from 20 to 80 atm, equivalence ratios from 0.5 to 2, and an initial temperature range of 600–1200 K, covering the compression ignition (CI) engine conditions. Extensive validations were performed against both 0-D simulations with the detailed mechanism and experimental data for spatially homogeneous systems. In order to perform three-dimensional turbulent spray-combustion and engine simulations, the mechanism was integrated with the multi-zone model in the CONVERGE CFD software to accelerate the calculation of detailed chemical kinetics. The Engine Combustion Network (ECN) data from Sandia National Laboratory was used for validation purposes along with single-cylinder Caterpillar engine data. The skeletal mechanism was able to predict various combustion characteristics accurately such as ignition delay and flame lift-off length (LOL) under different ambient conditions. The performance of the multi-zone solver with respect to the full cell-by-cell chemistry solver (SAGE) is compared for the Caterpillar engine simulation and a good match is obtained with significant speed-up of computational time for the multi-zone solver.

scholarly journals Characterization of short-pulse laser-produced plasmas at the Lawrence Livermore National Laboratory ultrashort-pulse laser

1993 ◽  
Author(s):  
Ronnie L. Shepherd ◽  
Dwight F. Price ◽  
William E. White ◽  
Albert L. Osterheld ◽  
Rosemary S. Walling ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Ultrashort Pulse ◽  
Short Pulse ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Ultrashort Pulse Laser ◽  
Short Pulse Laser

Characterization of a Plutonium-Bearing Zirconolite-Rich Synroc

1996 ◽  
Vol 465 ◽  
Author(s):  
E. C. Buck ◽  
B. Ebbinghaus ◽  
A. J. Bakel ◽  
J. K. Bates
Keyword(s):  
Oxidation State ◽  
Nuclear Weapons ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Waste Form ◽  
Ceramic Waste

ABSTRACTA titanate-based ceramic waste form, rich in phases structurally related to zirconolite (CaZrTi2O7), is being developed as a possible method for immobilizing excess plutonium from dismantled nuclear weapons. As part of this program, Lawrence Livermore National Laboratory (LLNL) produced several ceramics that were then characterized at Argonne National Laboratory (ANL). The plutonium-loaded ceramic was found to contain a Pu-Gd zirconolite phase but also contained plutonium titanates, Gd-polymignyte, and a series of other phases. In addition, much of the Pu was remained as PuO2-x. The Pu oxidation state in the zirconolite was determined to be mainly Pu4+, although some Pu3+ was believed to be present.

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