A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the performance of the information systems that the Internal Revenue Service (IRS) uses to process tax returns for individual taxpayers, focusing on: (1) IRS' tax processing systems performance in the 2000 filing season as reported by IRS compared to the 1999 filing season; and (2) whether IRS had taken actions to address problems affecting individual taxpayers."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Environmental Protection Agency's (EPA) paperwork burden, focusing on: (1) the general dimensions of EPA's paperwork requirements and the agency's progress toward reducing the burden that those requirements impose; (2) the process that EPA used to develop paperwork burden-hour estimates for its largest information collections as of September 30, 1998, and gauge the credibility of those estimates; (3) EPA's largest paperwork burden-hour reductions between September 30, 1995, and September 30, 1998, and gauge the credibility of those reductions; and (4) EPA's Reinventing Environmental Information initiative and the agency's new Office of Environmental Information."

A letter report issued by the General Accounting Office with an abstract that begins "GAO followed up on its previous report on the status of China's World Trade Organization (WTO) membership negotiations, focusing on the: (1) results of the November 1999 bilateral Agreement on Market Access between China and the United States; and (2) status of China's ongoing multilateral negotiations in the WTO."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Department of Veterans Affairs' (VA) efforts to address GAO's recommendations to improve VA's information technology (IT) program."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Department of Justice's (DOJ) policy and guidance for selecting structured settlement brokers, focusing on: (1) the policies and guidance for selecting structured settlement brokers used by DOJ and six selected agencies; and (2) a list of the structured settlement brokerage companies used by DOJ and the number of settlements awarded to each company since May 1997."

A letter report issued by the General Accounting Office with an abstract that begins "Some of the Environmental Protection Agency's (EPA) regulations set standards that limit environmental contaminants to levels that are determined, in large part, on the basis of the health risks they pose. When EPA assesses the health risks of contaminants, however, the agency is faced with uncertainties and gaps in scientific knowledge and data. This report summarizes GAO's findings on whether EPA's benefits estimates for major environmental regulations that establish health-based standards reflect precautionary assumptions about health risks. Three key factors influence EPA's use of precautionary assumptions in assessing health risks. First, EPA is influenced by its mission to protect human health and safeguard the natural environment. Second, EPA is influenced by the nature and extent of relevant data. Finally, EPA is influenced by the nature of the health risk being evaluated."

A letter report issued by the General Accounting Office with an abstract that begins "Under U.S. patent law, a patent must describe the subject invention in enough detail for someone skilled in that field to use or make it. In cases involving biological materials, the inventor may have to submit a sample. Some members of the biotechnology industry believe that biological deposits make patent infringement easier, reasoning that a person or organization can obtain a sample of the deposit and then reproduce the invention with minimal effort and expense. GAO found that access to biological deposits once a patent is granted has not increased the risk of patent infringement for the biotechnology industry. These concerns persist especially since the passage of the American Inventors Protection Act of 1999, which publishes the patent application 18 months from the date of filing and is made available to the public at that time rather than at the time the patent is granted."

A letter report issued by the General Accounting Office with an abstract that begins "This report discusses the Department of Housing and Urban Development's (HUD) efforts to resolve serious internal control weaknesses. During the past several years, serious internal control weaknesses and other deficiencies have plagued HUD's activities. In 1997, HUD announced its 2020 Management Reform Plan to overcome the agency's problems. HUD has made reasonable progress toward resolving material internal control weaknesses, but more remains to be done. Major steps that remain include bringing core financial systems into compliance with federal financial systems requirements, ensuring that rental subsidies are based on correct tenant income, improving the Federal Housing Administration's (FHA) multifamily project monitoring, improving budgetary and financial accounting controls, and enhancing support in the FHA business processes."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Internal Revenue Service's (IRS) use of nonaudit contacts with taxpayers, focusing on: (1) the frequency of use, variation in timing, and types of taxpayer responses for three major types of nonaudit contacts; and (2) analyzing the IRS' use of data from the three types of nonaudit contacts to improve compliance and service to taxpayers."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the status of the Federal Aviation Administration's (FAA) computer security efforts, focusing on: (1) FAA's history of computer security weaknesses, as described in GAO's May 1998 and December 1999 reports, and GAO's prior recommendations to address those weaknesses; (2) FAA's progress in implementing GAO's recommendations and its own personnel security policy, including GAO's assessment of the adequacy of these actions; and (3) the preliminary results of GAO's ongoing work."

Five commercial reactor criticals (CRCs) for the LaSalle Unit 1 boiling-water reactor have been analyzed using KENO V.a, the Monte Carlo criticality code of the SCALE 4 code system. The irradiated fuel assembly isotopics for the criticality analyses were provided by the Waste Package Design team at the Yucca Mountain Project in the United States, who performed the depletion calculations using the SAS2H sequence of SCALE 4. The reactor critical measurements involved two beginning-of-cycle and three middle-of-cycle configurations. The CRCs involved relatively low-cycle burnups, and therefore contained a relatively high gadolinium poison content in the reactor assemblies. This report summarizes the data and methods used in analyzing the critical configurations and assesses the sensitivity of the results to some of the modeling approximations used to represent the gadolinium poison distribution within the assemblies. The KENO V.a calculations, performed using the SCALE 44GROUPNDF5 ENDF/B-V cross-section library, yield predicted k{sub eff} values within about 1% {Delta}k/k relative to reactor measurements for the five CRCs using general 8-pin and 9-pin heterogeneous gadolinium poison pin assembly models.

During the 1990s, sport utility vehicles (SUVs) became the fastest growing segment of the auto industry, especially those in the medium-size category. In 1999, SUV sales reached almost 19% of the total light vehicle market and the mix of SUVs on the road, as measured by registration data, was about 8.7%. This immense popularity has been called by some a passing fad--vehicle purchases based on the SUV ''image''. But the continued yearly increases in SUV sales seem to indicate a more permanent trend. Additional explanations for SUV popularity include the general economic well being in the United States, a perception of safety, and ''utility''. Generally larger and heavier than the typical automobile, SUVs require more fuel per mile to operate and produce greater amounts of pollutants. They are also driven further annually than are automobiles of the same vintage, a fact that exacerbates the fuel-use and emission problems. Although buyers believe that SUVs are safer than automobiles which they are in some cases, SUVs are more prone to roll-overs than are automobiles. In addition, SUVs, with their higher bumpers and greater weight, may be a threat to other vehicles on the highway, especially in side-impact crashes. With sales projected to …

This report documents the technical support for the ATS provided by the Center for Transportation Analysis (CTA) in Oak Ridge National Laboratory (ORNL), which included the estimation of trip distances as well as daa quality editing and checking of variables required for the distance calculations.

We are attempting to characterize and model the micromechanical response of highly-filled polymers. In this class of materials, the continuous plastic binder used to bond the highly-filled material dominates the observed viscoelastic response. As a result, realistic lifetime analysis of these materials will require a thorough understanding of the contribution of the plastic binder. Laboratory applications of these materials include plastic bonded explosives, propellants, a variety of specialized filled organic materials for stockpile systems, and highly filled epoxy dielectric materials for the National Ignition Facility. We have explored numerous techniques to characterize the local microstructure of plastic bonded explosives. However, insufficient funding was obtained to bring these technologies to maturity, nevertheless our present tool set is significantly better than 2 years ago. We have also made some progress in developing an appropriate micromechanical constitutive modeling framework, based on a finite element method incorporating a cohesive zone model to represent the binder contribution within a Voronoi tesselation mesh structure for the PBX grains. A second modeling approach was used to incorporate analytical micromechanics (generalized self-consistent schemes). However, preliminary theoretical analysis strongly suggested that this approach would be invalid for such extremely high-filled systems like PBX.

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The objective of this calculation is to provide in-drift physical properties required by the drift-scale models (both two- and three-dimensional) used in total system performance assessments (TSPA). The physical properties include waste package geometry, waste package thermal properties, emplacement drift geometry including backfill and invert geometry and properties (both thermal and hydrologic), drip shield geometry and thermal properties, all tabulated in a single source.

The objectives of the research program were to identify and determine the relative importance of various sources of dissolved organic matter to the continental shelf, and to estimate the net carbon balance for the Middle Atlantic Bight.

This document summarizes the analysis of 3 basic criteria for the sampling systems that will provide waste validation samples of tank waste feeds prior to delivery to the waste treatment and immobilization plant where the wastes will be converted to glass forms. The assessed criteria includes sampling through a 4-inch riser, sampling while a mixer pump is operating, and the deployment of an at-tank analysis system. The assessment, based on the Phase I, 3S6 waste feed scenario, indicated that for high level waste, sampling through a 4-inch riser is not required but sampling while mixer pumps are operating will be required. For low activity waste, sampling through a 4-inch riser will be required but sampling while mixer pumps are operating is not required. The assessment indicated that an at-tank analysis system to provide tank mixing/settling (homogeneity) status is not needed since the number of tanks providing LAW feed was expanded and the payment basis in the original privatization contract has been modified.

The system description of the Double-Shell Tank (DST) Monitor and Control Subsystem establishes the system boundaries and describes the interface of the DST Monitor and Control Subsystem with new and existing systems that are required to accomplish the Waste Feed Delivery (WFD) mission.

This study is based on previous evaluations/proposals for removing the floating organic layer in C-103. A practical method is described with assumptions, cost and schedule estimates, and risks. Proposed operational steps include bulk organic removal, phase separation, organic washing and offsite disposal, followed by an in-situ polishing process.

This interim report describes a DOE project currently underway to establish what is known about decontamination of buildings and people and the procedures and protocols used to determine when and how people or buildings are considered ''clean'' following decontamination. To fulfill this objective, the study systematically examined reported decontamination experiences to determine what procedures and protocols are currently employed for decontamination, the timeframe involved to initiate and complete the decontamination process, how the contaminants were identified, the problems encountered during the decontamination process, how response efforts of agencies were coordinated, and the perceived social psychological effects on people who were decontaminated or who participated in the decontamination process. Findings and recommendations from the study are intended to aid decision-making and to improve the basis for determining appropriate decontamination protocols for recovery planners and policy makers for responding to chemical and biological events.

The isotopic composition of mixed-oxide fuel (fabricated with both uranium and plutonium isotopes) discharged from reactors is of interest to the Fissile Material Disposition Program. The validation of depletion codes used to predict isotopic compositions of MOX fuel, similar to studies concerning uranium-only fueled reactors, thus, is very important. The EEI-Westinghouse Plutonium Recycle Demonstration Program was conducted to examine the use of MOX fuel in the San Onofre PWR, Unit I, during cycles 2 and 3. The data, usually required as input to depletion codes, either one-dimensional or lattice codes, were taken from various sources and compiled into this report. Where data were either lacking or determined inadequate, the appropriate data were supplied from other references. The scope of the reactor operations and design data, in addition to the isotopic analyses, was considered to be of sufficient quality for depletion code validation.

In this paper, we first present the status of our computational modeling study of the thermal expansion coefficient of Fe{sub 3}Al over a wide range of temperature and evaluate its dependence on selected additives. This will be accomplished by applying an isobaric Monte Carlo technique. The required total energy of the sample will be computed by using a tight-binding (TB) method that allows us to significantly increase the size of the computational data base without reducing the accuracy of the calculations. The parameters of the TB Hamiltonian are fitted to reproduce the band structure obtained by our quantum mechanical full-potential LMTO calculations. The combination of the three methods mentioned above creates an effective approach to the computation of the physical properties of the transition-metal aluminides and it can be extended to alloys with more than two components. At present, we are using a simplified approach for a first-round of results; and as a test of the simplified approach, have obtained excellent agreement with experiment for aluminum. Our previous experimental results showed that, because of their smaller grain size, FA-187 and FA-189 are extrinsically more susceptible to environmental embrittlement than FA-186 under low strain loading condition. To further investigate the grain …

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