States

Department of the Navy: Unauthorized Activity Codes Used to Requisition New and Excess DOD Property (open access)

Department of the Navy: Unauthorized Activity Codes Used to Requisition New and Excess DOD Property

Correspondence issued by the General Accounting Office with an abstract that begins "GAO examined Navy inventory management activities to determine whether any unauthorized activity codes had been used to requisition new and excess property. GAO found that as of June 2000, the Navy maintained 2,002 activity codes identified as unauthorized to requisition government property. However, during the last five years, 663 of these codes were used to requisition more than $2 billion in new and excess government property. In addition, there were no safeguards in the Defense Automatic Addressing System Center or the Defense Reutilization and Marketing Service to prevent these activity codes from being used. This has created a condition in which government property is vulnerable to waste, fraud, and abuse."
Date: January 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Best Practices: Better Matching of Needs and Resources Will Lead to Better Weapon System Outcomes (open access)

Best Practices: Better Matching of Needs and Resources Will Lead to Better Weapon System Outcomes

A chapter report issued by the General Accounting Office with an abstract that begins "This report examines how best practices offer improvements to the way the Department of Defense defines and matches weapon system requirements to available resources such as cost, schedule, and mature technologies. GAO identified three factors that were key to matching needs and resources before product development began. First, developers employed the technique of systems engineering to identify gaps between resources and customer needs before committing to a new product development. Second, customers and developers were flexible. Leeway existed to reduce or defer customer needs to future programs or for the developer to make an investment to increase knowledge about a technology or design feature before beginning product development. Third, the roles and responsibilities of the customer and the product developer were matched, with the product developer being able to determine or significantly influence product requirements. In cases where these factors were not present at program launch, product development began without a match between requirements and resources. Invariably, this imbalance favored meeting customer needs by adding resources, which resulted in increased costs and later deliveries."
Date: March 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Defense Trade: The Use of Intellectual Property Generated at Department of Energy's Laboratories to Satisfy Offset Requirements (open access)

Defense Trade: The Use of Intellectual Property Generated at Department of Energy's Laboratories to Satisfy Offset Requirements

Correspondence issued by the General Accounting Office with an abstract that begins "This report discusses the use of intellectual property generated at the Department of Energy's (DOE) laboratories to satisfy defense contractors' offset requirements. GAO found that DOE's laboratory offset requirements have been limited. GAO's discussions with DOE and laboratory management contractors uncovered only 14 instances in which the laboratories' intellectual property were involved in offset projects. GAO also found that management contractors have the right to intellectual property that they produce at DOE laboratories."
Date: January 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Defense Inventory: Navy Spare Parts Quality Deficiency Reporting Program Needs Improvement (open access)

Defense Inventory: Navy Spare Parts Quality Deficiency Reporting Program Needs Improvement

A letter report issued by the General Accounting Office with an abstract that begins "The Department of Defense (DOD) budgets billions of dollars each year to purchase and repair the spare parts needed to maintain its weapons systems and support equipment. The quality of the spare parts can greatly determine if the Department's investment of funds is effective, efficient, and economical. This report examines the Navy's Product Quality Deficiency Reporting Program and the extent to which the program has gathered the data needed for the analysis, correction, and prevention of deficiencies in spare parts. GAO found that data on parts defects identified at the time of installation were underreported. Data on parts that failed after some operation but before their expected design life were not collected as part of this program. In the quality reports GAO reviewed, some key information was omitted on the cause of the parts' failures and some reports did not identify who was responsible for the defects. To a large extent, the program's ineffectiveness can be attributed to lack of management, limited training and incentives to report deficiencies, and competing priorities for the staff resources needed to carry out the program."
Date: August 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Intercollegiate Athletics: Four-Year Colleges' Experiences Adding and Discontinuing Teams (open access)

Intercollegiate Athletics: Four-Year Colleges' Experiences Adding and Discontinuing Teams

A letter report issued by the General Accounting Office with an abstract that begins "The number of women participating in intercollegiate athletics at four-year colleges and universities increased substantially between school years 1981-82 and 1998-99, while the number of men participating increased more modestly. The total number of women's teams increased by 3,784 teams, compared to an increase of 36 men's teams. In all, 963 schools added teams and 307 discontinued teams since 1992-93. The two factors cited most often as greatly influencing the decision to add or discontinue teams were the need to address student interest in particular sports and the need to meet gender equity goals and requirements. Schools that discontinued men's teams also found the need to reallocate the athletic budget to other sports. Colleges and universities that discontinued a team typically took three months or less between originating the proposal and making the final decision. Most schools informed members of the campus community of the possibility that the team would be discontinued, and most held meetings with campus groups before making the final decision. Most schools offered to help affected athletes transfer to other schools, and students receiving athletics-related financial aid continued to receive financial aid …
Date: March 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Alternative Minimum Tax: Overview of Its Rationale and Impact on Individual Taxpayers (open access)

Alternative Minimum Tax: Overview of Its Rationale and Impact on Individual Taxpayers

Testimony issued by the General Accounting Office with an abstract that begins "This testimony focuses on the Alternative Minimum Tax (AMT), its interaction with the regular tax system, and its projected growth in coverage. GAO found that (1) AMT was designed to ensure that high-income individuals do not avoid significant income tax liabilities--for tax year 1997, about 14,000 taxpayers would not have paid any income taxes absent AMT, (2) AMT operates as a separate tax system that parallels the regular individual income tax system but with different rules for determining taxable income, different tax rates for computing tax liability, and different rules for allowing the use of tax credits, (3) AMT affected about one percent of taxpayers in 2000 and accounted for about $5.8 billion in additional tax revenue; by 2010, it is expected to increase the tax liabilities of about one out of six taxpayers and account for about $189 billion in tax revenues over the period, (4) the projected increase in AMT coverage is, for the most part, attributable to inflation and to the scheduled expiration of legislation temporarily excluding some tax credits from AMT rules, and (5) AMT's impacts include increased taxpayer compliance burden; increased Internal Revenue …
Date: March 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
DOD Financial Management: Integrated Approach, Accountability, and Incentives Are Keys to Effective Reform (open access)

DOD Financial Management: Integrated Approach, Accountability, and Incentives Are Keys to Effective Reform

Testimony issued by the General Accounting Office with an abstract that begins "The results of the Defense Department (DOD) financial audit for fiscal year 2000 highlight long-standing financial management weaknesses that continue to plague the military. These weaknesses not only hamper the department's ability to produce timely and accurate financial management information but also unnecessarily increase the cost of carrying out its missions. Although DOD has made incremental improvement, it has a long way to go to overcome its long-standing, serious financial management weaknesses as part of a comprehensive, integrated reform of the department's business support operations. Such an overhaul must include not only DOD's financial management and other management challenges but also its high-risk areas of information technology and human capital management. Personnel throughout the department must share the common goal of reforming the department's business support structure. Without reengineering, DOD will have little chance of radically improving its cumbersome and bureaucratic processes."
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
IRS Modernization: Continued Improvement in Management Capability Needed to Support Long-Term Transformation (open access)

IRS Modernization: Continued Improvement in Management Capability Needed to Support Long-Term Transformation

Testimony issued by the General Accounting Office with an abstract that begins "This testimony discusses (1) how well the Internal Revenue Service (IRS) is providing service to taxpayers and ensuring compliance with tax laws, and (2) IRS' progress in its long-term effort to modernize. GAO found that IRS posted mixed results in 2001 in collecting revenues, providing taxpayer service, and enforcing tax laws. On the plus side, IRS processed millions of tax returns and issued refunds without significant problems, taxpayers had an easier time getting through to telephone assistors, and IRS said that it made progress in correcting weaknesses that threatened the security of electronically filed tax information. On the down side, the quality of service provided to taxpayers who visited taxpayer assistance centers, trends in audit rates and enforcement programs, and productivity all experienced troubling declines. With respect to modernization, IRS is making incremental progress in overhauling its organization, performance management system, business processes, and information technology. IRS is also making important progress in implementing its new organizational structure, developing a blueprint for modernizing its business processes and information systems, and more fully defining its strategic direction. However, IRS progress has fallen short of expectations. For example, IRS is …
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Pediatric Drug Research: Substantial Increase in Studies of Drugs for Children, But Some Challenges Remain (open access)

Pediatric Drug Research: Substantial Increase in Studies of Drugs for Children, But Some Challenges Remain

Testimony issued by the General Accounting Office with an abstract that begins "Children fall ill with many of the same diseases as adults and are often treated with the same drugs. However, only about 25 percent of drugs used today have been labeled for pediatric patients. The lack of pediatric testing and labeling can place children at risk of under- or overdosing, and the lack of age-appropriate formulations, such as liquids or chewable tablets, can result in improper administration of drugs. The pediatric exclusivity provision of the Food and Drug Administration Modernization Act of 1997 has successfully encouraged drug sponsors to generate needed information on how drugs work in children. A wide range of drugs are being studied in many therapeutic areas. The infrastructure for conducting pediatric trials has also been greatly strengthened, which should help to support continued progress. Although several drug labels have been changed to incorporate findings from research done under the pediatric exclusivity provision, label changes typically occur long after the Food and Drug Administration has granted the extension of market exclusivity. In addition, there continues to be little incentive to conduct pediatric research on off-patent drugs."
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Nuclear Regulation: Challenges Confronting NRC In a Changing Regulatory Environment (open access)

Nuclear Regulation: Challenges Confronting NRC In a Changing Regulatory Environment

Testimony issued by the General Accounting Office with an abstract that begins "This testimony discusses the challenges facing the Nuclear Regulatory Commission (NRC) as it moves from its traditional regulatory approach to a risk-informed, performance-based approach. GAO found that NRC's implementation of a risk-informed approach for commercial nuclear power plants is a complex, multiyear undertaking that requires basic changes to the regulations and processes NRC uses to ensure the safe operation of these plants. NRC needs to overcome several inherent difficulties as it seeks to apply a risk-informed regulatory approach to the nuclear material licensees, particularly in light of the large number of licensees and the diversity of activities they conduct. NRC will have to demonstrate that it is meeting its mandate (under the Government Performance and Results Act) of increasing public confidence in NRC as an effective regulator. NRC also faces challenges in human capital management, such as replacing a large percentage of its technical staff and senior managers who are eligible to retire. NRC has developed a five-year plan to identify and maintain the core competencies it needs and has identified legislative options to help resolve its aging staff problem."
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
District of Columbia: Comments on Fiscal Year 2000 Performance Report (open access)

District of Columbia: Comments on Fiscal Year 2000 Performance Report

A letter report issued by the General Accounting Office with an abstract that begins "The District of Columbia's fiscal year 2000 performance report is an improvement in that it meets some of the statutory requirements that the previous year's report did not. However, the extensive changes that the District made to its fiscal year 2000 performance goals during the fiscal year undermine the report's usefulness because the District did not include critical information needed by Congress and other stakeholders. Such information, identifying how, when, and why specific goals were altered and the decision-making and accountability implications of those changes, is important to Congress and others so that they can have confidence in the validity and completeness of the reported performance data. Also, the report does not cover all significant activities of the District government. Sustained progress is needed to address the critical performance and other management challenges that the District faces. The District recognizes the shortcomings with its performance management efforts and has stated a commitment to addressing them. The effective implementation of the various initiatives underway in the District is vital to the success of the District's efforts to create a more focused, results-oriented approach to management and decision-making--an …
Date: June 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Federal Power: The Evolution of Preference in Marketing Federal Power (open access)

Federal Power: The Evolution of Preference in Marketing Federal Power

A letter report issued by the General Accounting Office with an abstract that begins "Congress has enacted many statutes that designate types of customers or geographic areas for preference and priority in purchasing electricity from federal agencies. In general, the preference has been intended to (1) direct the benefits of public resources--relatively inexpensive hydropower--to portions of the public through nonprofit entities, (2) spread the benefits of federally generated hydropower widely and encourage the development of rural areas, (3) prevent private interests from exerting control over the full development of electric power on public lands, and (4) provide a yardstick against which the rates of investor-owned utilities can be measured. The applications of various preference provisions have been challenged several times in the courts, which have directed a power marketing administration (PMA) to provide power to preference customers. In other instances, they have supported the denial of power to such customers. The characteristics of the electricity industry have changed. During the last 20 years, competition has been replacing regulation in major sectors of the U.S. economy. Several proposals have come before Congress to restructure the electrical industry, including some that would encourage the states to allow retail customers a choice in …
Date: February 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Quality Assurance: The Fastener Quality Act's Small-Lot Exemption (open access)

Quality Assurance: The Fastener Quality Act's Small-Lot Exemption

A letter report issued by the General Accounting Office with an abstract that begins "This report reviews changes in fastener industry practice "resulting from or apparently resulting from" the small-lot exemption of the Fastener Quality Act. GAO found no evidence that the fastener industry changed any practices resulting from, or apparently resulting from, the small-lot exemption. The Customs Service's limited tests of imported fasteners in 2001 found no evidence of substandard fasteners and no evidence of any decline in the quality of fasteners from the results of tests Customs conducted in 1998."
Date: June 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Military Personnel: Actions Needed to Achieve Greater Results From Air Force Family Need Assessments (open access)

Military Personnel: Actions Needed to Achieve Greater Results From Air Force Family Need Assessments

A letter report issued by the General Accounting Office with an abstract that begins "To help military families adapt and function effectively in military life, the Department of Defense (DOD) funds a wide variety of personnel and family support programs. These programs use a combination of direct assistance and information and referral to help with crises, deployments, moves, child care, personal financial management, parenting, and transition out of the service. To efficiently distribute funds to those with the greatest need, DOD requires each service to assess the needs of military personnel and their families and their use of family support programs. This report examines (1) how the Air Force determines the needs of its military families, (2) what type of information about military family needs the Air Force obtains, and (3) how information from needs assessments affects the allocation of funding for Air Force family support programs. GAO found that the Air Force assesses the needs of its personnel every two years using a random sample survey. However, the Air Force process does not meet other DOD criteria generally recognized as important for needs assessments, including the use of benchmarks to determine if needs have changed or emerged. Additionally, the …
Date: March 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Olympic Games: Costs to Plan and Stage the Games in the United States (open access)

Olympic Games: Costs to Plan and Stage the Games in the United States

A letter report issued by the General Accounting Office with an abstract that begins "Since 1980, the Winter and Summer Olympic and Paralympic Games hosted in the United States have increased in size and magnitude, as have the total direct costs to plan and stage them. The reported direct costs to plan and stage the games discussed in this report ranged from $363 million to more than $2.4 billion. Although the total dollar amount of federal funding and support has increased, the total federal share of the reported total direct costs to plan and stage the games has decreased. Since 1980, the amount of funding and support provided by state and local governments has increased. Generally, federal funding and support for the total direct costs of each of these games was either specifically designated by Congress or approved by the federal agencies."
Date: November 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
District of Columbia: Oversight in the Post-Control Board Period (open access)

District of Columbia: Oversight in the Post-Control Board Period

Testimony issued by the General Accounting Office with an abstract that begins "Although the District of Columbia, the Financial Responsibility and Management Assistance Authority, and Congress have achieved an enormous accomplishment in restoring the District to financial viability, many of the challenges the District faced in the past continue. The District and Congress need current, reliable information about the District's financial condition and developing trends in order to promptly respond to any pressures or warning signs that could indicate that future difficulties lie ahead. Toward that end, the District must ensure that its new financial management system is effectively implemented and provides decision makers with reliable and timely data. In addition, since 1995, Congress has put in place a number of reporting requirements to help provide the financial, planning, and performance information that it needs to conduct effective oversight and make decisions. Congress may wish to consider additional mechanisms to ensure that it and the District have the information needed to help the District maintain its financial viability and address its current and emerging challenges. Such mechanisms must be considered and implemented within a context that seeks to balance two sets of values: the overriding importance of Home Rule and …
Date: June 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Social Security: Observations on Improving Distribution of Death Information (open access)

Social Security: Observations on Improving Distribution of Death Information

Testimony issued by the General Accounting Office with an abstract that begins "Congress, law enforcement, and others have expressed concern about the misuse of Social Security numbers (SSNs). Death information collected by the Social Security Administration (SSA), including the SSN, generally reaches financial institutions and other entities within one to two months of a person's death. SSA and the National Technical Information Service could improve the timeliness of the distribution of the Death Master File. Improving the timeliness of death information to the financial services industry would help to narrow the window of time that a criminal has to open new accounts using a deceased individual's identity. Additional education for the financial services industry about the availability and contents of the Death Master File would also be helpful. Providing timely death information and making financial institutions more aware of a reliable source of such information could deter criminals from using deceased individuals' social security numbers to obtain false identities for fraudulent activities."
Date: November 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Free Trade Area of the Americas: April 2001 Meetings Set Stage for Hard Bargaining to Begin (open access)

Free Trade Area of the Americas: April 2001 Meetings Set Stage for Hard Bargaining to Begin

Testimony issued by the General Accounting Office with an abstract that begins "The Free Trade of the Americas Agreement (FTAA) would eliminate tariffs and create common trade and investment rules within the 34 democratic nations of the Western Hemisphere. The trade ministers for FTAA faced an ambitious agenda at the April 2001 meetings. Accommodations reached by the ministers on controversial issues, such as labor and the environment, antidumping, and nations with small economies, allowed countries to set forth basic principles while keeping topics on the table for future resolution. As a result of the movement on these controversial issues, the trade ministers were able to set out clear objectives and deadlines to promote progress during the next 18 months of the negotiations. The trade ministers told negotiating groups to (1) eliminate material that is in dispute to the maximum extent possible; (2) develop recommendations by April 1, 2002, on the methods and ground rules for negotiation; and (3) develop, where appropriate, inventories of tariffs, nontariff barriers, subsidies, and other practices that distort trade. To build public support for the FTAA process, and to promote transparency in the negotiating process, the trade ministers agreed to publicly release the draft text of …
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Health Privacy: Regulation Enhances Protection of Patient Records but Raises Practical Concerns (open access)

Health Privacy: Regulation Enhances Protection of Patient Records but Raises Practical Concerns

Testimony issued by the General Accounting Office with an abstract that begins "Advances in information technology, along with an increasing number of parties with access to identifiable health information, have created new challenges to maintaining the privacy of medical records. Patients and providers alike have expressed concern that broad access to medical records by insurers, employers, and others may result in inappropriate use of the information. Congress sought to protect the privacy of individuals' medical information as part of the Health Insurance Portability and Accountability Act of 1996 (HIPAA). HIPAA included a timetable for developing comprehensive privacy standards that would establish rights for patients with respect to their medical records and define the conditions for using and disclosing identifiable health information. The final privacy regulation offers all Americans the opportunity to know and, to some extent, control how physicians, hospitals, and health plans use their personal information. At the same time, these entities will face a complex set of privacy requirements that are not well understood at this time. Some of the uncertainty expressed by stakeholder groups reflects the recent issuance of the regulation. With time, everyone will have greater opportunity to examine its provisions and assess their implications for …
Date: February 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Tax Administration: Status of IRS' Efforts to Develop Measures of Voluntary Compliance (open access)

Tax Administration: Status of IRS' Efforts to Develop Measures of Voluntary Compliance

A letter report issued by the General Accounting Office with an abstract that begins "The U.S. tax system is based on voluntary reporting. The Internal Revenue Service (IRS) reviews all tax returns after they are filed to ensure compliance with tax laws governing this voluntary system. Despite these efforts, each year billions of dollars in taxes owed are not voluntarily reported and paid, which could result in reduced revenue to fund federal programs, higher tax rates, or both. There are three types of voluntary compliance measures: filing compliance, which measures the percent of taxpayers who file returns in a timely manner; payment compliance, which measures the percent of tax payments that are paid in a timely manner; and reporting compliance, which measures the percent of actual tax liability that is reported accurately on returns. This report reviews the status of IRS' plans to measure voluntary reporting compliance as well as six other federal programs that currently measure voluntary compliance. GAO found that IRS has tried to develop an approach for measuring voluntary compliance. It has established objectives and guiding principles for developing this measure as well as developed database software to collect and analyze data. As of March 2001, IRS' …
Date: June 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
International Monetary Fund: Few Changes Evident in Design of New Lending Program for Poor Countries (open access)

International Monetary Fund: Few Changes Evident in Design of New Lending Program for Poor Countries

A chapter report issued by the General Accounting Office with an abstract that begins "The effectiveness and appropriateness of the International Monetary Fund's lending programs to poor countries have been widely debated, generally centering on whether the program has improved these countries' economies. In response to some of these concerns and as part of a concerted international effort to reduce poverty, the Fund expanded the goals of its lending program to its poorest members in 1999 to include an explicit focus on poverty reduction. To underscore this focus, the Fund renamed its concessional lending program the Poverty Reduction and Frowth Facility. GAO found that although the design of the facility does not differ significantly from the Fund's previous program, some elements of the new program are emphasized more now than in the past. The one major design change--getting countries to take ownership of their macroeconomic framework--is difficult to achieve for three reasons. First, many recipient governments have limited capacity to independently analyze and effectively negotiate the macroeconomic framework, which reduces the opportunity for country-specific elements to be addressed. Second, it is difficult to effectively engage nongovernmental organizations in a dialogue on these very complex matters. Finally, a national dialogue on …
Date: May 8, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Department of the Air Force: Unauthorized Activity Codes Used to Requisition New and Excess DOD Property (open access)

Department of the Air Force: Unauthorized Activity Codes Used to Requisition New and Excess DOD Property

Correspondence issued by the General Accounting Office with an abstract that begins "GAO examined the military's inventory management activities to determine if activity codes identified as unauthorized to requisition had been used to buy property for the Air Force. GAO found that as of June 2000, the Air Force maintained 4,239 activity codes identified as unauthorized to requisition government property. However, during the last five years, 193 of these codes were inappropriately used to requisition nearly $23 million in new and excess government property. In addition, safeguards established to prevent unauthorized activity codes from being used to requisition government property failed. This situation has created a condition in which government property is vulnerable to waste, fraud, and abuse."
Date: January 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
General Services Administration: Unauthorized Activity Codes Used to Requisition New and Excess Government Property (open access)

General Services Administration: Unauthorized Activity Codes Used to Requisition New and Excess Government Property

Correspondence issued by the General Accounting Office with an abstract that begins "As of June 2000, the General Services Administration (GSA) maintained 52 activity codes identified as unauthorized to requisition government property. During the last five years, four of these codes were inappropriately used to requisition about $3,000 in new and excess government property. Although this amount represents a small percentage of total GSA requisitions made during the five-year period, existing safeguards are inadequate to prevent the use of unauthorized activity codes to requisition government property. GSA is now tracing the various items."
Date: January 8, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Experimental Evaluation of Tude Support Plate Crevice Chemistry (open access)

Experimental Evaluation of Tude Support Plate Crevice Chemistry

A test methodology for measuring temperature, impedance, pH, and electrochemical potential distributions within a sludge-packed tube support plate crevice in a laboratory test is described. The method successfully showed that there were large concentration gradients between the tube and tube support plate sides of the crevice. The testing also showed that strong bases concentrated more effectively than strong acids, and that the crevice pH, when exposed to seawater-based solutions, increased with increasing superheat and decreasing bulk concentration. The large variations in the crevice chemistry observed under heat transfer were eliminated upon shutdown. These new test data suggest that it might be beneficial to evaluate the variation in the extent of stress corrosion cracking with tube support plate elevation found in some steam generators in light of local chemistry changes, as well as the variation in tubing temperature. Because of the large crevice chemistry gradients during boiling heat transfer and their subsequent homogenization upon test shutdown, the results suggest reassessing the use of hideout return measurements and tube deposit analyses in industry to infer the crevice chemistry under heat transfer conditions.
Date: May 8, 2001
Creator: Baum, Allen
Object Type: Report
System: The UNT Digital Library