Weld region corrosion during chemical cleaning of PWR (pressurized-water reactor) steam generators: Volume 1, Overview and discussion: Final report
The potential for preferential corrosion of steam generator weld regions during chemical cleaning using the generic SGOG solvents was investigated. The investigations included development and use of a corrosion assessment test facility which measured corrosion currents in a realistic model of the steam generator geometry in the vicinity of a specific weld during a simulated chemical dissolution of sludge consisting of essentially pure magnetite. A corrosion monitoring technique was developed and qualified. In this technique free corrosion rates measured by linear polarization techniques are added to corrosion rates calculated from galvanic current measured using a zero resistance ammeter to give an estimate of total corrosion rate for a galvanically corroding material. An analytic modeling technique was developed and proved useful in determining the size requirements for the weld region mockup used in the corrosion assessment test facility. The test results obtained during this investigation indicated that chemical cleaning using the SGOG magnetite dissolution solvent can be performed with a small amount of corrosion of secondary side internals and pressure boundary welds.
- Research Organization:
- MPR Associates, Inc., Washington, DC (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6435203
- Report Number(s):
- EPRI-NP-5267-Vol.1; ON: TI87920521; TRN: 87-028095
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
INCONEL 600
CORROSION
PWR TYPE REACTORS
STEAM GENERATORS
WELDED JOINTS
CLEANING
RESEARCH PROGRAMS
TUBES
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
INCONEL ALLOYS
IRON ALLOYS
JOINTS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
REACTORS
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
360105 - Metals & Alloys- Corrosion & Erosion