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Hydrogen water chemistry to mitigate intergranular stress corrosion cracking: In-reactor tests: Final report

Technical Report ·
OSTI ID:5133010
; ;
In-reactor studies of intergranular stress corrosion cracking (IGSCC) in sensitized Type 304 stainless steel were performed during operation under hydrogen water chemistry (HWC) in the Swedish Ringhals-1 BWR. Techniques used were constant elongation rate tensile (CERT) tests and corrosion potential (ECP) measurements. Objective of the tests was to identify and investigate factors other than oxygen concentration in the water, which affect IGSCC. Results show that hydrogen peroxide and sulfate in the water severely enhance IGSCC, and thus need to be controlled to fully mitigate IGSCC by HWC. Hydrogen in recirculation water was mildly beneficial, and nitrate was fairly harmless. HWC arrests existing IGSCC cracks, but if HWC is stopped the cracks eventually become reactivated. No difference in IGSCC propensity was found between unfilmed steel and steel prefilmed in the HWC environment for eight weeks. 40 refs., 16 figs., 13 tabs.
Research Organization:
ASEA-ATOM AB, Vaesteraas (Sweden)
OSTI ID:
5133010
Report Number(s):
EPRI-NP-5800M; ON: TI88010465
Country of Publication:
United States
Language:
English

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