Neutralization of Crevice Acids. Final Report (PWR)

摘要

Capsule, pot-boiler, and model steam-generator tests were conducted to develop chemical procedures for limiting dent growth in nuclear steam generators. Testing included isothermal soaks and on-line chemical additions. In the typical test procedure, denting was initiated in the test vehicle, a neutralizer was applied, and the subsequent course of denting followed. Non-destructive and destructive examinations were conducted at the conclusion of testing to investigate the mechanism and side effects of each neutralization procedure. Soak environments included hydraxine-treated water, and solutions of sodium phosphate, sodium nitrite, calcium nitrite, sodium hydroxide, and boric acid. Chemicals used for on-line additions were calcium hydroxide and boric acid. (ERA citation 08:040678)