Examination of Kewaunee steam generator tubes R4C81 and R11C9
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
Two mill annealed Alloy 600 steam generator tubes were pulled from the hot leg side of Steam Generator B at the Kewaunee Nuclear Power Plant to investigate eddy current indications at and just above the tubesheet top for Tube R4-C81 and within the unexpanded tubesheet crevice region of Tube R11-C9. The tubes were examined by nondestructive and destructive examination techniques. Both tubes had a long, axial crack within the tubesheet crevice region. The cracking was caused by secondary side intergranular stress corrosion (IGSCC). The crack morphology also had some three dimensional grain boundary degradation or intergranular attack (IGA) characteristics. In addition, Tube R4-C81 had a large network of predominately axial IGSCC with some minor circumferential IGSCC at and just above the tubesheet top region. The IGSCC had strong IGA characteristics. From analyses performed on OD deposits and crack fracture face oxide films, it was concluded that an alkaline crevice environment was associated with the stress corrosion. 4 refs., 5 figs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Westinghouse Electric Corp., Pittsburgh, PA (United States)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 5651610
- Report Number(s):
- EPRI-NP-7370-M
- Country of Publication:
- United States
- Language:
- English
Similar Records
Remedial methods for intergranular attack of Alloy 600 tubing. Volume 1. Plant corrosion morphologies and remedial methods. Final report
Alkaline intergranular corrosion and stress corrosion cracking of Alloy 600
Related Subjects
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOY-NI76CR15FE8
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
BOILERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COOLING SYSTEMS
CORROSION
CORROSION RESISTANT ALLOYS
DIAGRAMS
ENERGY SYSTEMS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 600
INCONEL ALLOYS
INTERGRANULAR CORROSION
IRON ALLOYS
KEWAUNEE REACTOR
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIMONIC
NONDESTRUCTIVE TESTING
PHASE DIAGRAMS
POWER REACTORS
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
SECONDARY COOLANT CIRCUITS
STEAM GENERATORS
STRESS CORROSION
TESTING
TITANIU
TITANIUM ADDITIONS
TUBES
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS