Neutralization of tubesheet crevice corrosion. Final report

Technical Report · Sun May 01 04:00:00 EDT 1983

DOI:https://doi.org/10.2172/5871597· OSTI ID:5871597

Conner, W. M.; Aspden, R. G.; Hermer, R.; Pessall, N.

Alloy 600 intergranular attack (IGA) representative of that observed in operating plants has been produced in isothermal capsule tests. Uniform IGA occurred to a depth of 6 to 8 mil in 90 days at 650/sup 0/F in a test environment consisting of 40 wt % NaOH + 10 wt % KOH + 12 wt % Cr/sub 2/O/sub 3/. Lesser amounts of IGA (1 to 2 mil) were produced in the same environment without Cr/sub 2/O/sub 3/ in 90 days. In 40 wt % NaOH + 10 wt % KOH, sodium nitrate prevented all stress-corrosion cracking (SCC) and IGA in stressed C-ring and isothermal capsule tests. Other additives to this environment such as SiO/sub 2/, CuO + ZnO, SiO/sub 2/ + CuO + ZnO decreased IGA but increased the susceptibility of mill annealed Alloy 600 to SCC. Neither IGA nor SCC was produced in a single-tube model-boiler heat-transfer test operated on all-volatile chemistry plus hydrazine with continuous inleakage of simulated Lake Ontario water. Attempts to reduce the propensity for SCC and to simulate IGA by reducing the amount of oxidant in the sludge was apparently responsible for the absence of both SCC and IGA.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
• OSTI ID: 5871597
• Report Number(s): EPRI-NP-3040; ON: DE83902666
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CORROSION
DATA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INCONEL 600
INCONEL ALLOYS
INFORMATION
INTERGRANULAR CORROSION
IRON ALLOYS
MATERIALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUMERICAL DATA
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
PWR TYPE REACTORS
REACTOR MATERIALS
REACTORS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
STEAM GENERATORS
STRESS CORROSION
TEST FACILITIES
TESTING
TUBES
VAPOR GENERATORS
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS