Abstract
The present work is a study of the corrosion susceptibility of steel drums in contact with cemented ion-exchange resins contaminated with different types and concentrations of aggressive species. A special type of specimen was manufactured to simulate the cemented ion-exchange resins in the drum. The evolution of the corrosion potential and the corrosion rate of the steel, as well as the electrical resistivity of the matrix were monitored over a time period of 900 days. The aggressive species studied were chloride ions (the main ionic species of concern) and sulphate ions (produced during radiolysis of the cationic exchange-resins after cementation). The work was complemented with an analysis of the corrosion products formed on the steel in each condition, as well as the morphology of the corrosion products. When applying the results obtained in the present work to estimate the corrosion depth of the steel drumscontaining the cemented radioactive waste after a period of 300 years (foreseen durability of the Intermediate Level Radioactive Waste facility in Argentina) , it is found that in the most unfavourable case (high chloride contamination), the corrosion penetration will be considerably lower than the thickness of the wall of the steel drums.
Highlights
IntroductionThe main wastes arising during the operation of a nuclear power plant are components which are removed during refuelling or maintenance (activated solids such as stainless steel containing cobalt and nickel-63) or operational wastes such as radioactive liquids, filters, and ion-exchange resins which are contaminated with fission products from circuits containing liquid coolant
The main wastes arising during the operation of a nuclear power plant are components which are removed during refuelling or maintenance or operational wastes such as radioactive liquids, filters, and ion-exchange resins which are contaminated with fission products from circuits containing liquid coolant
The present work is a study of the corrosion susceptibility of steel drums in contact with cemented ion-exchange resins contaminated with different types and concentrations of aggressive species
Summary
The main wastes arising during the operation of a nuclear power plant are components which are removed during refuelling or maintenance (activated solids such as stainless steel containing cobalt and nickel-63) or operational wastes such as radioactive liquids, filters, and ion-exchange resins which are contaminated with fission products from circuits containing liquid coolant. EPJ Web of Conferences matrixes and packed in 200-litre drums with an extra enclosure made of concrete to guarantee the radionuclides containment. The present work is a study of the corrosion susceptibility of steel drums in contact with cemented ion-exchange resins contaminated with different types and concentrations of aggressive species. To achieve this aim, a special type of specimen was manufactured to simulate the cemented ion-exchange resins in the drum [1]. The aggressive species studied were chloride ions (the main ionic species of concern) and sulphate ions (produced during radiolysis of the cationic exchange-resins after cementation [2,3]). The work was complemented with an analysis of the corrosion products formed on the steel in each condition, as well as the morphology of the corrosion process
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