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Title: Engineering Task Plan for Fourth Generation Hanford Corrosion Monitoring System

Abstract

This Engineering Task Plan (ETP) describes the activities associated with the installation of cabinets containing corrosion monitoring equipment on tanks 241-AN-102 and 241-AN-107. The new cabinets (one per tank) will be installed adjacent to existing corrosion probes already installed in riser WST-RISER-016 on both tanks. The corrosion monitoring equipment to be installed utilizes the technique of electrochemical noise (EN) for monitoring waste tank corrosion. Typically, EN consists of low frequency (4 Hz) and small amplitude signals that are spontaneously generated by electrochemical reactions occurring at corroding or other surfaces. EN analysis is well suited for monitoring and identifying the onset of localized corrosion, and for measuring uniform corrosion rates. A typical EN based corrosion-monitoring system measures instantaneous fluctuations in corrosion current and potential between three nominally identical electrodes of the material of interest immersed in the environment of interest. Time-dependent fluctuations in corrosion current are described by electrochemical current noise, and time-dependent fluctuations of corrosion potential are described by electrochemical noise. The corrosion monitoring systems are designed to detect the onset of localized corrosion phenomena if tank conditions should change to allow these phenomena to occur. In addition to the EN technique, the systems also facilitate the use of themore » Linear Polarization Resistance (LPR) technique to collect uniform corrosion rate information. LPR measures the linearity at the origin of the polarization curve for overvoltages up to a few millivolts away from the rest potential or natural corrosion potential. The slope of the current vs. voltage plot gives information on uniform corrosion rates.« less

Authors:
Publication Date:
Research Org.:
CHG (US)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (US)
OSTI Identifier:
803951
Report Number(s):
RPP-6399, Rev.0
EDT-629676; TRN: US0300805
DOE Contract Number:  
AC27-99RL14047
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; STORAGE FACILITIES; MONITORS; INSTALLATION; CORROSION PRODUCTS; MONITORING; ELECTRODES; POLARIZATION; RADIOACTIVE WASTE STORAGE; DESIGN

Citation Formats

NORMAN, E.C. Engineering Task Plan for Fourth Generation Hanford Corrosion Monitoring System. United States: N. p., 2000. Web. doi:10.2172/803951.
NORMAN, E.C. Engineering Task Plan for Fourth Generation Hanford Corrosion Monitoring System. United States. doi:10.2172/803951.
NORMAN, E.C. Tue . "Engineering Task Plan for Fourth Generation Hanford Corrosion Monitoring System". United States. doi:10.2172/803951. https://www.osti.gov/servlets/purl/803951.
@article{osti_803951,
title = {Engineering Task Plan for Fourth Generation Hanford Corrosion Monitoring System},
author = {NORMAN, E.C.},
abstractNote = {This Engineering Task Plan (ETP) describes the activities associated with the installation of cabinets containing corrosion monitoring equipment on tanks 241-AN-102 and 241-AN-107. The new cabinets (one per tank) will be installed adjacent to existing corrosion probes already installed in riser WST-RISER-016 on both tanks. The corrosion monitoring equipment to be installed utilizes the technique of electrochemical noise (EN) for monitoring waste tank corrosion. Typically, EN consists of low frequency (4 Hz) and small amplitude signals that are spontaneously generated by electrochemical reactions occurring at corroding or other surfaces. EN analysis is well suited for monitoring and identifying the onset of localized corrosion, and for measuring uniform corrosion rates. A typical EN based corrosion-monitoring system measures instantaneous fluctuations in corrosion current and potential between three nominally identical electrodes of the material of interest immersed in the environment of interest. Time-dependent fluctuations in corrosion current are described by electrochemical current noise, and time-dependent fluctuations of corrosion potential are described by electrochemical noise. The corrosion monitoring systems are designed to detect the onset of localized corrosion phenomena if tank conditions should change to allow these phenomena to occur. In addition to the EN technique, the systems also facilitate the use of the Linear Polarization Resistance (LPR) technique to collect uniform corrosion rate information. LPR measures the linearity at the origin of the polarization curve for overvoltages up to a few millivolts away from the rest potential or natural corrosion potential. The slope of the current vs. voltage plot gives information on uniform corrosion rates.},
doi = {10.2172/803951},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}