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Title: INTERIM REPORT FOR HANFORD TANKS AY-102 & AP-101 EFFECT OF CHEMISTRY & OTHER VARIABLES ON CORROSION & STRESS CORROSION CRACKING

Abstract

The objective of this work is to determine the range of conditions where the tank steel is susceptible to localized corrosion and SCC in simulants for waste in tanks AY-102 and AP-101.

Authors:
Publication Date:
Research Org.:
Hanford Site (HNF), Richland, WA
Sponsoring Org.:
USDOE - Office of Environmental Management (EM)
OSTI Identifier:
903344
Report Number(s):
RPP-RPT-31932 Rev 0
TRN: US200722%%111
DOE Contract Number:
DE-AC27-99RL14047
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMISTRY; CORROSION; STEELS; STRESS CORROSION; TANKS; WASTES

Citation Formats

HARTY, W.M.. INTERIM REPORT FOR HANFORD TANKS AY-102 & AP-101 EFFECT OF CHEMISTRY & OTHER VARIABLES ON CORROSION & STRESS CORROSION CRACKING. United States: N. p., 2007. Web. doi:10.2172/903344.
HARTY, W.M.. INTERIM REPORT FOR HANFORD TANKS AY-102 & AP-101 EFFECT OF CHEMISTRY & OTHER VARIABLES ON CORROSION & STRESS CORROSION CRACKING. United States. doi:10.2172/903344.
HARTY, W.M.. Sat . "INTERIM REPORT FOR HANFORD TANKS AY-102 & AP-101 EFFECT OF CHEMISTRY & OTHER VARIABLES ON CORROSION & STRESS CORROSION CRACKING". United States. doi:10.2172/903344. https://www.osti.gov/servlets/purl/903344.
@article{osti_903344,
title = {INTERIM REPORT FOR HANFORD TANKS AY-102 & AP-101 EFFECT OF CHEMISTRY & OTHER VARIABLES ON CORROSION & STRESS CORROSION CRACKING},
author = {HARTY, W.M.},
abstractNote = {The objective of this work is to determine the range of conditions where the tank steel is susceptible to localized corrosion and SCC in simulants for waste in tanks AY-102 and AP-101.},
doi = {10.2172/903344},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat May 05 00:00:00 EDT 2007},
month = {Sat May 05 00:00:00 EDT 2007}
}

Technical Report:

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  • Laboratory testing was performed to develop a comprehensive understanding of the corrosivity of the tank wastes stored in Double-Shell Tanks using simulants primarily from Tanks 241-AP-105, 241-SY-103 and 241-AW-105. Additional tests were conducted using simulants of the waste stored in 241-AZ-102, 241-SY-101, 241-AN-107, and 241-AY-101. This test program placed particular emphasis on defining the range of tank waste chemistries that do not induce the onset of localized forms of corrosion, particularly pitting and stress corrosion cracking. This document summarizes the key findings of the research program.
  • 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 report describes the results of testing sludge samples from Hanford tanks 241-AY-102 (AY-102) and 241-BX-101 (BX-101). These tests were conducted to characterize the sludge and assess the water leachability of contaminants from the solids. This work is being conducted to support the tank closure risk assessments being performed by CH2M HILL Hanford Group, Inc. for the U.S. Department of Energy. This is the first report of testing of BX-101 sludge and the second report of testing of AY-102. Lindberg and Deutsch (2003) described the first phase of testing on AY-102 material.
  • The proposed addition of the 7-in long, 4-in to 3-in cast iron reducer (Figures 1 thru 3) resulted in an elevation increase to the ENRAF assembly above the 3-in riser. The total weight of the above ground assembly is 3 17 Ihs. The center of gravity relative to grade and to the centerline of the stack are 0.93-in away from the centerline and 33.57-in above grade. The governing seismic load per UBC-97, Equation 30-5 was 126 lbf. This resulted in bending stresses in the 4-in to 3-in cast-iron reducer and the 3-in riser to he 870.7 psi and 2,455.3 psi,more » respectively. The allowable bending stresses on the 4-in to 3-in cast-iron reducer and the 3-in riser were determined to be 2,100 psi and 23,100 psi, respectively. A shear stress check was performed on the 4-in to 3-in cast-iron reducer due to its relatively high bending stress compared to its allowable bending stress. By inspection, the shear stress in the 3-in riser was low in comparison to the bending stresses and did not warrant evaluation. The maximum combined beam shearing stress on the 4-in to 3-in reducer was determined to be 81.4 psi as compared to the allowable shear stress of 1,400 psi.« less