Impact of makeup water system performance on PWR steam generator corrosion. Final report

Technical Report · Sat Jun 01 04:00:00 EDT 1985

OSTI ID:5510707

Bell, M J; Pearl, W L; Sawochka, S G; Smith, L A

The objectives of this project were to review makeup system design and performance and assess the possible relation of pressurized water reactor (PWR) steam generator corrosion to makeup water impurity ingress at fresh water sites. Project results indicated that makeup water transport of most ionic impurities can be expected to have a significant impact on secondary cycle chemistry only if condenser inleakage and other sources of impurities are maintained at very low levels. Since makeup water oxygen control techniques at most study plants were not consistent with state-of-the-art technology, oxygen input to the cycle via makeup can be significant. Leakage of colloidal silica and organics through makeup water systems can be expected to control blowdown silica levels and organic levels throughout the cycle at many plants. Attempts to correlate makeup water quality to steam generator corrosion observations were unsuccessful since (1) other impurity sources were significant compared to makeup at most study plants, (2) many variables are involved in the corrosion process, and (3) in the case of IGA, the variables have not been clearly established. However, in some situations makeup water can be a significant source of contaminants suspected to lead to both IGA and denting.

• Research Organization: NWT Corp., San Jose, CA (USA)
• OSTI ID: 5510707
• Report Number(s): EPRI-NP-4050; ON: TI85920832
• Country of Publication: United States
• Language: English

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