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Title: ELECTROCHEMICAL CORROSION STUDY FOR TANK 241-AY-102 SLUDGE

Abstract

The report describes the analyses performed on core samples from the sludge region of the waste in Tank 241-AY-102 to determine the electrochemical corrosion potential.

Authors:
Publication Date:
Research Org.:
Hanford Site (HNF), Richland, WA
Sponsoring Org.:
USDOE Assistant Secretary for Environmental Management (EM)
OSTI Identifier:
940008
Report Number(s):
RPP-12077 Rev 0
TRN: US0807066
DOE Contract Number:
DE-AC27-99RL14047
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ELECTROCHEMICAL CORROSION; SLUDGES; STORAGE FACILITIES; HANFORD RESERVATION; RADIOACTIVE WASTE STORAGE; CORROSIVE EFFECTS

Citation Formats

DUNCAN JB. ELECTROCHEMICAL CORROSION STUDY FOR TANK 241-AY-102 SLUDGE. United States: N. p., 2002. Web. doi:10.2172/940008.
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DUNCAN JB. ELECTROCHEMICAL CORROSION STUDY FOR TANK 241-AY-102 SLUDGE. United States. doi:10.2172/940008.
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DUNCAN JB. Tue . "ELECTROCHEMICAL CORROSION STUDY FOR TANK 241-AY-102 SLUDGE". United States. doi:10.2172/940008. https://www.osti.gov/servlets/purl/940008.
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@article{osti_940008,
title = {ELECTROCHEMICAL CORROSION STUDY FOR TANK 241-AY-102 SLUDGE},
author = {DUNCAN JB},
abstractNote = {The report describes the analyses performed on core samples from the sludge region of the waste in Tank 241-AY-102 to determine the electrochemical corrosion potential.},
doi = {10.2172/940008},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 24 00:00:00 EDT 2002},
month = {Tue Sep 24 00:00:00 EDT 2002}
}
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Technical Report:
View Technical Report (14.52 MB)
DOI:  10.2172/940008
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  • Corrosion rates using supernatant samples retrieved from near the top of the liquid layer were determined for the tanks. Corrosion rates using settled solids (saltcake) were determined. The supernatant samples were tested as received without argon sparging. The settled solid sample segments were extruded under anaerobic condition and kept under a sweep of humidified argon gas during 'the electrochemical corrosion testing. The class of steel used to construct the tank in question was used, and test coupons were allowed to equilibrate for a minimum of 18 hours before a Tafel scan was initiated. The coupons were scanned from -250 mVmore » to +250 mV from the rest or open circuit potential. The corrosion rate is reported along with the corrosion current measurement, open circuit potential, and a chi-square statistic generated by the instrument controlling and analysis algorithm.« less

  • ;
    This document reports the results of electrochemical corrosion tests on AS1S Grade 60 carbon steel coupons exposed to tank 241-AY-102 sludge under conditions similar to those near the bottom of the tank. The tests were performed to evaluate the corrosive behavior of the waste in contact with sludge that does not meet the chemistry control limits of Administrative Control (AC) 5.15, Corrosion Mitigation Program.

  • Corrosion product from the annulus side of the double-shell tank 241-AY-102 primary wall was retrieved and analyzed. The analyses indicated that the tank wall was wetted with water leading to corrosion. The water source was quite likely the ingress of water from an external source and condensation of moisture during the long annulus ventilation system shutdowns. Corrosion of the primary tank wall in the annulus of double-shell tank (DST) 241-AY-102 was observed during the review of annulus videos of the tank in year 2001. This resulted in the issuance of an occurrence report, RP-CHG-TANKFARM-2001-0106. The occurrence report required collection andmore » evaluation of the corrosion product to determine the cause of such corrosion. Therefore, a corrosion product sample was collected from the annulus side of the primary wall through Riser 80 in February 2003. The sample was scanned by Operational Health Physics and found to contain no radioactivity. The sample was then released and transmitted to ChemMet, Ltd , PC, for analyses. The present report discusses the types of analyses performed and the results of these analyses from ChemMet, Ltd , PC (Divine 2003) along with conclusions and recommendations. The letter report from ChemMet, Ltd, PC is attached.« less

  • This report documents the chemical compatibility of waste types within tanks 241-C-106, 241-AY-101, and 241-AY-102. This information was compiled to facilitate the transfer of tank 241-C-106 waste to tank 241-AY-102 utilizing supernatant from tank 241-AY-101 as the sluicing medium. This document justifies that no chemical compatibility safety issues currently understood, or theorized from thermodynamic modeling, will result from the intended sluice transfer operation.

  • This report documents the chemical compatibility of waste types within tanks 241-C-106, 241-AY-101, and 241-AY-102. This information was compiled to facilitate the transfer of tank C-106 waste to tank AY-102 utilizing supernatant from AY-101 as the sluicing medium. This document justifies that no chemical compatibility safety issues currently understood, or theorized from thermodynamic modeling, will result from the intended sluice transfer operation.