Intergranular attack of alloy 600 tubing: Simulation tests: Interim report

Technical Report · Sat Aug 01 00:00:00 EDT 1987

OSTI ID:6238018

Daret, J

In some steam generators, intergranular attack (IGA) has been detected on alloy 600 tubes within or near the tube sheet crevice region. Refreshed autoclave tests were performed to simulate caustic or river water in-leakage. The objective of the caustic tests was to perfect the test methodology, in order to closely simulate IGA that occurs in an actual steam generator, to identify causes and to test countermeasures in future tests. Tests with caustic pollution succeeded in producing representative IGA, and the test method is now believed applicable for studying countermeasures. The continuation of a river water fault test already tested for 4500 hours was aimed at checking if IGA was producible with only fresh water in-leakage, or if other deleterious species were involved in the cause of phenomenon. IGA was not detected for this case, which tends to indicate that another (not yet identified) specie acts as either a depassivating agent or a corrosion initiator in actual steam generators.

• Research Organization: CEA Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Section d'Etude de la Corrosion Aqueuse; Framatome, 92 - Paris La Defense (France); Electric Power Research Inst., Palo Alto, CA (USA)
• OSTI ID: 6238018
• Report Number(s): EPRI-NP-5377; ON: TI87920572
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
INCONEL 600
INTERGRANULAR CORROSION
PWR TYPE REACTORS
STEAM GENERATORS
TUBES
CRACK PROPAGATION
CREVICE CORROSION
DESTRUCTIVE TESTING
EDDY CURRENT TESTING
ELECTROCHEMISTRY
PH VALUE
STRESS CORROSION
WATER CHEMISTRY
ALLOYS
BOILERS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CORROSION
ELECTROMAGNETIC TESTING
INCONEL ALLOYS
IRON ALLOYS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NONDESTRUCTIVE TESTING
REACTORS
TESTING
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
360105 - Metals & Alloys- Corrosion & Erosion