Download or read book Review of Corrosion Inhibition in High Level Radioactive Waste Tanks in the DOE Complex written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radioactive waste is stored in underground storage tanks at the Department of Energy (DOE) Savannah River Site (SRS). The waste tanks store supernatant liquid salts, consisting primarily of sodium nitrate, sodium nitrite, sodium hydroxide, and sludge. An assessment of the potential degradation mechanisms of the high level waste (HLW) tanks determined that nitrate- induced pitting corrosion and stress corrosion cracking were the two most significant degradation mechanisms. Controls on the solution chemistry (minimum nitrite and hydroxide concentrations) are in place to prevent the initiation and propagation of pitting and stress corrosion cracking in the tanks. These controls are based upon a series of experiments performed using simulated solutions on materials used for construction of the tanks. The technical bases and evolution of these controls is presented.
Download or read book Proceedings of The 20th Pacific Basin Nuclear Conference written by Hong Jiang and published by Springer. This book was released on 2017-01-10 with total page 951 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first in a series of three proceedings of the 20th Pacific Basin Nuclear Conference (PBNC). This volume covers the topics of Safety and Security, Public Acceptance and Nuclear Education, as well as Economics and Reducing Cost. As one in the most important and influential conference series of nuclear science and technology, the 20th PBNC was held in Beijing and the theme of this meeting was “Nuclear: Powering the Development of the Pacific Basin and the World”. It brought together outstanding nuclear scientist and technical experts, senior industry executives, senior government officials and international energy organization leaders from all across the world. The book is not only a good summary of the new developments in the field, but also a useful guideline for the researchers, engineers and graduate students.
Download or read book Corrosion Monitoring of High level Waste Tanks written by and published by . This book was released on 1993 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-level nuclear wastes are currently being stored in carbon steel tanks at the Hanford Site. The wastes are stored in both single-shell tanks (SSTs) and double-shell tanks (DSTs). The SSTs have already exceeded their design life and some of these tanks have already leaked waste into the surrounding soil. The DSTs, on the other hand, were fabricated and put into operation more recently and have not been observed to show any leakage of wastes. One of the objectives at the Hanford Site is to monitor the degradation of the DSTs with the aid of in-tank corrosion probes. Outside the nuclear industry, electrochemical and resistance corrosion probes are in common use. The application of these probes to nuclear waste storage is generally complicated by the high radiation and complexed caustic environment. This paper deals with the details of a proposed development of commercial probes to monitor corrosion of the DSTs at the Hanford Site. Once the corrosion probes are successfully developed, the technology can be applied to SSTs and also transferred to other US Department of Energy (DOE) Sites.
Download or read book Corrosion and Failure Processes in High level Waste Tanks written by and published by . This book was released on 1992 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large amount of radioactive waste has been stored safely at the Savannah River and Hanford sites over the past 46 years. The aim of this report is to review the experimental corrosion studies at Savannah River and Hanford with the intention of identifying the types and rates of corrosion encountered and indicate how these data contribute to tank failure predictions. The compositions of the High-Level Wastes, mild steels used in the construction of the waste tanks and degradation-modes particularly stress corrosion cracking and pitting are discussed. Current concerns at the Hanford Site are highlighted.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Performance written by and published by . This book was released on 2003-07 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vapor Corrosion Response of Low Carbon Steel Exposed to Simulated High Level Radioactive Waste written by B. Wiersma and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A program to resolve the issues associated with potential vapor space corrosion and liquid/air interface corrosion in the Type III high level waste tanks is in place. The objective of the program is to develop understanding of vapor space (VSC) and liquid/air interface (LAIC) corrosion to ensure a defensible technical basis to provide accurate corrosion evaluations with regard to vapor space and liquid/air interface corrosion. The results of the FY05 experiments are presented here. The experiments are an extension of the previous research on the corrosion of tank steel exposed to simple solutions to corrosion of the steel when exposed to complex high level waste simulants. The testing suggested that decanting and the consequent residual species on the tank wall is the predominant source of surface chemistry on the tank wall. The laboratory testing has shown that at the boundary conditions of the chemistry control program for solutions greater than 1M NaNO{sub 3}{sup -}. Minor and isolated pitting is possible within crevices in the vapor space of the tanks that contain stagnant dilute solution for an extended period of time, specifically when residues are left on the tank wall during decanting. Liquid/air interfacial corrosion is possible in dilute stagnant solutions, particularly with high concentrations of chloride. The experimental results indicate that Tank 50 would be most susceptible to the potential for liquid/air interfacial corrosion or vapor space corrosion, with Tank 49 and 41 following, since these tanks are nearest to the chemistry control boundary conditions. The testing continues to show that the combination of well-inhibited solutions and mill-scale sufficiently protect against pitting in the Type III tanks.
Download or read book Corrosion Considerations for Life Management of Hanford High level Waste Tanks written by and published by . This book was released on 1993 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential for corrosion-related aging mechanisms to be active in the Hanford Site waste tanks is frequently questioned and there are related uncertainties. This paper considers surveillance and analyses for evaluating the potential influence of corrosion processes such as stress corrosion cracking, pitting, crevice corrosion of the reinforced concrete steel on the useful life of Hanford radioactive waste tanks. There are two types of Hanford Site underground reinforced concrete, carbon steel lined waste tank structures. They primarily store caustic nitrate wastes, some at elevated temperatures, from defense reprocessing of spent nuclear fuels. Some of the Hanford waste tanks have leaked radioactive liquid waste to the soil. These leaks are possibly due to nitrate-induced stress corrosion cracking. Major efforts prescribed to avoid nitrate-induced stress corrosion cracking in newer tank designs appear successful. A potential for pitting and crevice corrosion cracking in the carbon steel liners exists. There has been no evidence of significant uniform corrosion of the carbon steel liners and there has been no evidence of waste tank degradation caused by corrosion of the concrete reinforcing steel. A waste tank life management program is being developed to qualify the Hanford waste tanks for continued safe storage of these wastes. Corrosion evaluations, structural analyses, and surveillance are required to qualify the tanks and to promptly detect evidence of possible distress.
Download or read book Evaluation of stainless steel tank corrosion in ICPP high level radioactive waste service written by T. L. Hoffman and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Waste Tank Corrosion Program at Savannah River Site written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Savannah River Site (SRS) has approximately 30 million gallons of high level radioactive waste stored in 51 underground tanks. SRS has maintained an active corrosion research and corrosion control and monitoring program throughout the operating history of SRS nuclear waste storage tanks. This program is largely responsible for the successful waste storage experience at SRS. The program has consisted of extensive monitoring of the tanks and surrounding environment for evidence of leaks, extensive research to understand the potential corrosion processes, and development and implementation of corrosion chemistry control. Current issues associated with waste tank corrosion are primarily focused on waste processing operations and are being addressed by a number of active programs and initiatives.
Download or read book Development and Deployment of Advanced Corrosion Monitoring Systems for High Level Waste Tanks written by and published by . This book was released on 2002 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the results of a collaborative technology development program, sponsored by the Tanks Focus Area, to use electrochemical noise (EN) for corrosion monitoring in underground storage tanks. These tanks, made of carbon or stainless steels, contain high-level radioactive liquid waste (HLW) generated by weapons production or radioactive liquid waste from nuclear fuel reprocessing activities at several Department of Energy (DOE) sites. The term EN is used to describe low frequency fluctuations in current and voltage measurements associated with corrosion. In their most basic form, EN-based corrosion monitoring systems measure and record these fluctuations over time from electrodes immersed in the environment of interest--in this case, radioactive tank waste. The resulting EN signals have characteristic patterns for different corrosion mechanisms. In recent years, engineers and scientists from several DOE sites, in collaboration with several private companies, have conducted laboratory studies and field applications to correlate the EN signals with corrosion mechanisms active in the radioactive waste tanks. The participating DOE sites are Hanford, Savannah River, Oak Ridge Reservation and the Idaho National Engineering and Environmental Laboratory. The commercial vendors have included HiLine Engineering and Fabrication, Inc., EIC Laboratories, Inc., and AEA Technologies. Successful deployment of the EN technology will yield improved information of waste tank corrosion conditions, better tank management, and lower overall cost.
Download or read book Investigation of the Corrosivity of the Vapor Phase Over High Level Radioactive Waste written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion in the vapor space and at the liquid/air interface of the Department of Energy high level waste tanks have emerged as a potentially aggressive degradation mechanism.
Download or read book New Challenges in the Safety Analysis of DOE s High level Waste Tanks written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Analysis of Inhibitor Concentrations for Radioactive Waste in Carbon Steel Tanks written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a logistic regression approach, a model was developed using the explanatory variables log([NO3−]), log([NO2−]), and temperature to estimate the probability of pitting in a carbon steel exposed to high-level radioactive waste. Pitting susceptibility data obtained by the two techniques of cyclic potentiodynamic polarization and coupon immersion were separately and jointly analyzed with the model. Similar predictive ability is seen for equations based on both electrochemical and coupon immersion data. Using the theory associated with the determination of confidence intervals for the estimated probability, a methodology was developed to provide a lower bound for the nitrite concentration which inhibits pitting, i.e., which holds the estimated probability of pitting to a reasonably low level of 0.05.
Download or read book A review of localized corrosion of high level nuclear waste container materials 1 written by G. Cragnolino and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book VAPOR SPACE AND LIQUID AIR INTERFACE CORROSION OF LOW CARBON STEEL IN COMPLEX HIGH LEVEL RADIOACTIVE WASTE SOLUTION written by KARTHIK. SUBRAMANIAN and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Criticality Safety Review of Hanford High level Radioactive Waste Tank Farms written by John M. Clark and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
