Parallelization of a Large Scale Hydrocarbon Pool Fire in the Uintah PSE

2002 ◽  
Author(s):  
Rajesh Rawat ◽  
Jennifer P. Spinti ◽  
Wing Yee ◽  
Philip J. Smith
Keyword(s):  
Time Scales ◽  
Large Scale ◽  
National Laboratory ◽  
Pool Fire ◽  
Massively Parallel ◽  
Turbulent Reacting Flows ◽  
Dynamic Features ◽  
Complex Flow ◽  
Los Alamos National Laboratory ◽  
Hydrocarbon Pool

Realistic simulation of complicated systems such as large-scale pool fires requires the representation of relevant physical processes such as turbulent reacting flows, convective and radiative heat transfer, and fundamental gas-phase chemistry. Resolution of the length and time scales responsible for controlling the dynamic features of fire are also required to capture important fire physics. Resolving these length and time scales, however, requires massively parallel computations. To achieve coupling of these complicated processes in a massively parallel environment, software components that reuse physics-based, legacy fire codes (written in Fortran) are developed and integrated with Uintah, a component-based, visual Problem Solving Environment (PSE) [1]. Uintah provides the framework for large-scale parallelization for different applications. The integration of the new fire code in Uintah is built on three principles: 1) Develop different, reusable, physics-based components that can be used interchangeably and interact with other components, 2) reuse the legacy fire code as much as possible, and 3) use components developed by third parties, specifically non-linear and linear solvers designed for solving complex-flow problems. The simulation of a 10-m heptane pool fire illustrates the parallel scalability obtained with the integrated fire code. Linear scalability to 1000 processors is obtained on the SGI Origin 2000 at Los Alamos National Laboratory.

Improved Technologies for Decontamination and Reuse of Plutonium Contaminated Gloveboxes

2003 ◽  
Author(s):  
John McFee ◽  
Kevin Barbour
Keyword(s):  
Nitric Acid ◽  
Large Scale ◽  
National Laboratory ◽  
Electrochemical Techniques ◽  
Decontamination Factor ◽  
Activity Level ◽  
Department Of Energy ◽  
Contamination Level ◽  
Los Alamos ◽  
Los Alamos National Laboratory

The Los Alamos Large Scale Demonstration and Deployment Project (LSDDP), in support of the US Department of Energy (DOE) Deactivation and Decommissioning Focus Area (DDFA), has been identifying and demonstrating technologies to reduce the cost and risk of management of transuranic element contaminated large metal objects, i.e. gloveboxes. DOE must dispose of hundreds of gloveboxes from Rocky Flats Environmental Technology Site (RFETS), Los Alamos National Laboratory (LANL), and other DOE sites. This paper reports on the results of four technology demonstrations on decontamination of plutonium-contaminated gloveboxes with each technology compared to a common baseline technology, wipedown with nitric acid. The general objective of the demonstrations was decontamination to an alpha-emitting nuclide disintegration rate of less than 50,000 disintegrations per minute per 100 square centimeters (dpm/100 cm2), the surface activity level desired for re-application of these particular gloveboxes to a new mission. The technologies demonstrated include: • A LANL-developed electrochemical decontamination system (EDS) technique utilizing a recycled electrolyte solution to contact the glovebox surface via a small electrode fixture, which is moved from location to location until the entire metal surface is decontaminated. • A commercial three-step decontamination technology marketed by Environmental Alternatives Inc. (EAI) was demonstrated to quantify its performance relative to the baseline technology. • Cerium (IV) nitrate decontamination, previously utilized at other DOE sites and developed for application to gloveboxes at RFETS, was demonstrated to quantify its performance in this application. • A Russian-developed electrochemical decontamination (ECD) technology was monitored by the Los Alamos LSDDP for potential application in DOE. Although this decontamination activity was not an LSDDP “demonstration,” it was planned, monitored, and reported using LSDDP methodologies. Generally, the experience from these demonstrations shows that all innovative technologies perform better than the baseline, nitric acid wipedown. The goal of meeting 50,000 dpm/100 cm2 was not achieved by the baseline technology or cerium nitrate decontamination at all measured locations with the number of decontamination technologies used in the demonstration. Additional decontamination cycles were estimated for achievement of the targeted activity for cost estimating purposes. However, the actual decontamination achieved may be acceptable for LLW status at some facilities. Both electrochemical techniques are capable of decontaminating surfaces to the targeted contamination level and, if desired, can decontaminate to very low levels. The EAI technology is the best performing of the wipedown techniques, but is more costly. Table I summarizes the number of cycles the various technologies required to achieve the desired decontamination level and the associated decontamination factor.

Automated mineral analysis in TASK8

1990 ◽  
Vol 48 (2) ◽  
pp. 212-213
Author(s):  
William F. Chambers ◽  
Arthur A. Chodos ◽  
Roland C. Hagan
Keyword(s):  
National Laboratory ◽  
Control Program ◽  
Mineral Analysis ◽  
Alamos National Laboratory ◽  
Mineral Phase ◽  
Los Alamos National Laboratory ◽  
California Institute Of Technology ◽  
Mineral Phases ◽  
Letter Code ◽  
Institute Of Technology

TASK8 was designed as an electron microprobe control program with maximum flexibility and versatility, lending itself to a wide variety of applications. While using TASKS in the microprobe laboratory of the Los Alamos National Laboratory, we decided to incorporate the capability of using subroutines which perform specific end-member calculations for nearly any type of mineral phase that might be analyzed in the laboratory. This procedure minimizes the need for post-processing of the data to perform such calculations as element ratios or end-member or formula proportions. It also allows real time assessment of each data point.The use of unique “mineral codes” to specify the list of elements to be measured and the type of calculation to perform on the results was first used in the microprobe laboratory at the California Institute of Technology to optimize the analysis of mineral phases. This approach was used to create a series of subroutines in TASK8 which are called by a three letter code.

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