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Evaluation Of Alternatives For Upgrading Double Shell Tank Corrosion Monitoring At Hanford
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Book Synopsis Evaluation of Alternatives for Upgrading Double Shell Tank Corrosion Monitoring at Hanford by :
Download or read book Evaluation of Alternatives for Upgrading Double Shell Tank Corrosion Monitoring at Hanford written by and published by . This book was released on 1996 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent discovery of low hydroxide conditions in Double Shell Tanks have demonstrated that the current corrosion control system of waste sampling and analysis is inadequate to monitor and maintain specified chemistries for dilute and low volume waste tanks. Moreover, waste sampling alone cannot provide adequate information to resolve the questions raised regarding tank corrosion. This report evaluates available technologies which could be used to improve on the existing corrosion control system. The evaluation concludes that a multi-technique corrosion monitoring system is necessary, utilizing ultrasonic and visual examinations for direct evaluation of tank liner condition, probes for rapid detection (alarm) of corrosive conditions, and waste sampling and analysis for determination of corrective action. The probes would incorporate electrochemical noise and linear polarization resistance techniques. When removed from the waste tank, the probe electrodes would be physically examined as corrosion coupons. The probes would be used in addition to a modified regimen of waste sampling and the existing schedule for ultrasonic examination of the tank liners. Supporting information would be obtained by examination of in-tank equipment as it is removed.
Book Synopsis Hanford Double Shell Tank Corrosion Monitoring Instrument Trees by :
Download or read book Hanford Double Shell Tank Corrosion Monitoring Instrument Trees written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hanford Double Shell Tank Corrosion Monitoring Instrument Tree Prototype by :
Download or read book Hanford Double Shell Tank Corrosion Monitoring Instrument Tree Prototype written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Final Report Technical Review Panel for Electrochemical Noise (EN) Based Corrosion Monitoring of Hanford Double Shell Tanks (DST). by :
Download or read book Final Report Technical Review Panel for Electrochemical Noise (EN) Based Corrosion Monitoring of Hanford Double Shell Tanks (DST). written by and published by . This book was released on 2001 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document provides evidence of the various engineering and environmental groups effort to validate that ORP, WDOE, WDOH, and RPP requirements have been incorporated into the operator rounds.
Book Synopsis Design of Second Generation Hanford Tank Corrosion Monitoring System by :
Download or read book Design of Second Generation Hanford Tank Corrosion Monitoring System written by and published by . This book was released on 1998 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Hanford Site has 177 underground waste tanks that store approximately 253 million liters of radioactive waste from 50 years of plutonium production. Twenty-eight tanks have a double shell and are constructed of welded ASTM A537-Class 1 (UNS K02400), ASTM A515-Grade 60 (UNS K02401), or ASTM A516-Grade 60 (UNS K02100) material. The inner tanks of the double-shell tanks (DSTS) were stress relieved following fabrication. One hundred and forty-nine tanks have a single shell, also constructed of welded mild steel, but not stress relieved following fabrication. Tank waste is in liquid, solid, and sludge forms. Tanks also contain a vapor space above the solid and liquid waste regions. The composition of the waste varies from tank to tank but generally has a high pH (>12) and contains sodium nitrate, sodium hydroxide, sodium nitrite, and other minor radioactive constituents resulting from plutonium separation processes. Leaks began to appear in the single-shell tanks shortly after the introduction of nitrate-based wastes in the 1950s. Leaks are now confirmed or suspected to be present in a significant number of single-shell tanks. The probable modes of corrosion failures are reported as nitrate stress corrosion cracking (SCC) and pitting. Previous efforts to monitor internal corrosion of waste tank systems have included linear polarization resistance (LPR) and electrical resistance techniques. These techniques are most effective for monitoring uniform corrosion, but are not well suited for detection of localized corrosion (pitting and SCC). The Savannah River Site (SRS) investigated the characterization of electrochemical noise (EN) for monitoring waste tank corrosion in 1993, but the tests were not conclusive. The SRS effort has recently been revived and additional testing is underway. For many years, EN has been observed during corrosion and other electrochemical reactions, and the phenomenon is well established. Typically, EN consists of low frequency (
Book Synopsis Tank Closure and Waste Management for the Hanford Site by :
Download or read book Tank Closure and Waste Management for the Hanford Site written by and published by . This book was released on 2012 with total page 1150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Engineering Evaluation of Alternatives: Technologies for Monitoring Interstitial Liquids in Single-shell Tanks by :
Download or read book Engineering Evaluation of Alternatives: Technologies for Monitoring Interstitial Liquids in Single-shell Tanks written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Process Test Plan for 4TH Generation Hanford Corrosion Monitoring System by :
Download or read book Process Test Plan for 4TH Generation Hanford Corrosion Monitoring System written by and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instrumentation and cabinets for the 241-AN-107 and 241-AN-102 corrosion monitoring systems will be upgraded in FY 2000. The bulk of the field work involved in this task will involve placement of the corrosion monitoring data collection hardware closer to the risers that house the existing corrosion probes. This will be accomplished by placing a new climate controlled cabinet by the risers containing corrosion probes on these two tanks (one cabinet per tank). Once installed the systems will feed data back to a centralized corrosion monitoring station in the 241-AN-271 instrument building. The upgraded systems will be operated under the bounds of this Process Test Plan (PTP) for six principle reasons. These reasons were established prior to installing the original systems in 1997 (241-AN-107) and 1998 (241-AN-102). They are as follows: (1) Acquire corrosion data on the waste in 241-AN-107 and 241-AN-102. (2) Provide supporting data to the site's Integrity Assessment program. (3) Demonstrate that corrosion monitoring by evaluation of electrochemical noise data is possible in waste tank systems, particularly with regard to the detection of general corrosion and (if present) pitting and stress corrosion cracking. (4) Demonstrate the durability of the design of the corrosion monitoring equipment. (5) Extend tank life and reduce annual operations cost. (6) Provide basis to control corrosion in double shell tanks though the use of direct corrosion monitoring rather than waste sampling and analysis. The designs of the existing corrosion probes in 241-AN-107 and 241-AN-102 were reviewed and documented prior to the original installation activities in 1997 and 1998. Initial programmatic documentation for Hanford's corrosion monitoring program was also established prior to the original installation activities.
Book Synopsis Chemical Species in the Vapor Phase of Hanford Double-Shell Tanks by :
Download or read book Chemical Species in the Vapor Phase of Hanford Double-Shell Tanks written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of corrosive and inhibiting chemicals on the tank walls in the vapor space, arising from the waste supernatant, dictate the type and degree of corrosion that occurs there. An understanding of how waste chemicals are transported to the walls and the affect on vapor species from changing supernatant chemistry (e.g., pH, etc.), are basic to the evaluation of risks and impacts of waste changes on vapor space corrosion (VSC). In order to address these issues the expert panel workshop on double-shell tank (DST) vapor space corrosion testing (RPP-RPT-31129) participants made several recommendations on the future data and modeling needs in the area of DST corrosion. In particular, the drying of vapor phase condensates or supernatants can form salt or other deposits at the carbon steel interface resulting in a chemical composition at the near surface substantially different from that observed directly in the condensates or the supernatants. As a result, over the past three years chemical modeling and experimental studies have been performed on DST supernatants and condensates to predict the changes in chemical composition that might occur as condensates or supernatants equilibrate with the vapor space species and dry at the carbon steel surface. The experimental studies included research on both the chemical changes that occurred as the supernatants dried as well as research on how these chemical changes impact the corrosion of tank steels. The chemical modeling and associated experimental studies were performed at the Pacific Northwest National Laboratory (PNNL) and the research on tank steel corrosion at the Savannah River National Laboratory (SRNL). This report presents a summary of the research conducted at PNNL with special emphasis on the most recent studies conducted in FY10. An overall summary of the project results as well as their broader implications for vapor space corrosion of the DST's is given at the end of this report.
Book Synopsis Hanford Double Shell Waste Tank Corrosion Studies - Final Report FY2014 by :
Download or read book Hanford Double Shell Waste Tank Corrosion Studies - Final Report FY2014 written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: SRNL tasks for FY14 included studies to evaluate the susceptibility of carbon steel to vapor space corrosion (VSC), liquid-air interface (LAI) corrosion, and pitting corrosion. Additionally, SRNL evaluated the susceptibility of carbon steel to pitting corrosion under buffered waste conditions, with the objective of determining the adequate amount of inhibitor (e.g., nitrite) necessary to mitigate pitting corrosion. Other CPP experiments were performed in historical waste simulants and the results were compared to previously gathered results. The results of these activities were utilized to assess the robustness of the standardized CPP protocol.
Book Synopsis Engineering Evaluation of Alternatives: Managing the Assumed Leak from Single-shell Tank 241-T-101 by :
Download or read book Engineering Evaluation of Alternatives: Managing the Assumed Leak from Single-shell Tank 241-T-101 written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hanford Review of Double-Shell Tank Construction by :
Download or read book Hanford Review of Double-Shell Tank Construction written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technology Review of Nondestructive Methods for Examination of Water Intrusion Areas on Hanford's Double-Shell Waste Tanks by :
Download or read book Technology Review of Nondestructive Methods for Examination of Water Intrusion Areas on Hanford's Double-Shell Waste Tanks written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Under a contract with CH2M Hill Hanford Group, Inc., PNNL has performed a review of the NDE technology and methods for examination of the concrete dome structure of Hanford's double-shell tanks. The objective was to provide a matrix of methodologies that could be evaluated based on applicability, ease of deployment, and results that could provide information that could be used in the ongoing structural analysis of the tank dome. PNNL performed a technology evaluation with the objective of providing a critical literature review for all applicable technologies based on constraints provided by CH2M HILL. These constraints were not mandatory, but were desired. These constraints included performing the evaluation without removing any soil from the top of the tank, or if necessary, requesting that the hole diameter needed to gain access to evaluate the top of the tank structure to be no greater than approximately 12-in. in diameter. PNNL did not address the details of statistical sampling requirements as they depend on an unspecified risk tolerance. PNNL considered these during the technology evaluation and have reported the results in the remainder of this document. Many of the basic approaches to concrete inspection that were reviewed in previous efforts are still in use. These include electromagnetic, acoustic, radiographic, etc. The primary improvements in these tools have focused on providing quantitative image reconstruction, thus providing inspectors and analysts with three-dimensional data sets that allow for operator visualization of relevant abnormalities and analytical integration into structural performance models. Available instruments, such as radar used for bridge deck inspections, rely on post-processing algorithms and do not provide real-time visualization. Commercially available equipment only provides qualitative indications of relative concrete damage. It cannot be used as direct input for structural analysis to assess fitness for use and if necessary to de-rate critical components. There are currently no tools that automatically convert the NDE data to formats compatible with structural analysis programs. While radiographic techniques still provide significant advantages in spatial resolution, non-ionizing techniques are still preferred. Radar imagining in the 1-5 GHz has become the most useful. Unfortunately the algorithms and underlying assumptions used in these reconstructions are proprietary, and it is not possible to assess the quality and limitations of the analytical methods used to generate the derived structural data. The hypothesis that water intrusion may contribute to potential rebar corrosion of the tank domes provided the primary guidance in reviewing and evaluating available NDE technologies. Of primary concern is the need to employ technologies that provide the best opportunity for visualizing the rebar and providing quantitative data that can be integrated into structural analysis efforts to better understand and quantify the structural capacity of the domes. The conclusion is that an imaging system capable of locating and quantifying the distribution and conditions of the cement, aggregate, and rebar will provide the most valuable baseline upon which to build a case for the integrity of the structure. If successful, such a system would fulfill the need to incorporate valuable data into current structural load capacity analysis.
Author :United States. Congress. House. Committee on Science and Technology Publisher : ISBN 13 : Total Pages :1948 pages Book Rating :4.3/5 (121 download)
Book Synopsis Fiscal year 1983 Department of Energy budget review by : United States. Congress. House. Committee on Science and Technology
Download or read book Fiscal year 1983 Department of Energy budget review written by United States. Congress. House. Committee on Science and Technology and published by . This book was released on 1982 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Congressional Budget Request by : United States. Department of Energy
Download or read book Congressional Budget Request written by United States. Department of Energy and published by . This book was released on 1981 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis SUMMARY AND RECOMMENDATIONS OF THE EXPERT PANEL OVERSIGHT COMMITTEE MEETING ON DOUBLE-SHELL TANK CORROSION MONITORING AND TESTING HELD AUGUST 4-5 2008 by :
Download or read book SUMMARY AND RECOMMENDATIONS OF THE EXPERT PANEL OVERSIGHT COMMITTEE MEETING ON DOUBLE-SHELL TANK CORROSION MONITORING AND TESTING HELD AUGUST 4-5 2008 written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Expert Panel Oversight Committee (EPOC) on Double-Shell Tank Corrosion Monitoring and Testing has been overseeing the Fiscal Year FY 2008 experimental program being performed at CC Technologies (CCT) to optimize the chemistry control for corrosion limits in Double-Shell Tanks (DSTs). The EPOC met at the M & D Professional Services Conference Facility on August 4 and 5, 2008 to discuss various aspects of that responsibility including FY 2009 planning. Formal presentations were made to update the EPOC on the these subjects.
Book Synopsis The Office of Environmental Management Technical Reports by :
Download or read book The Office of Environmental Management Technical Reports written by and published by . This book was released on 1997 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
