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

Technical Report · Sat Aug 01 04:00:00 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

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ALLOYS
BOILERS
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