By International Atomic Energy Agency
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Sample text
The water conductivity, pH, and chloride, nitrate, nitrite and sulphate contents will be recorded. 3. Results A total of six racks were withdrawn from the two basins during 1996–1997. These racks were withdrawn after six and 12 months of exposure. Out of the 360 individual coupons examined during the first year of exposure, pitting was observed on four coupons, as shown in Fig. 6. Further detailed investigations on these coupons using scanning electron microscopy showed iron filings embedded on the surface of the aluminium.
14]. There have been a number of cases related to jet aircraft fuel tanks and in petrochemical fuel environments. In these cases of microbiologically influenced pitting, the pits were crystallographic in nature, with faceted pit walls, even though the service environments were quite different. No faceted pits, or even a tendency towards faceted pits, were observed when metallography of pitted aluminium alloy coupons in the SRS corrosion surveillance programme was carried out. Pitting of the aluminium alloys in the SRS reactor basin water can be attributed to the conductivity and impurity concentration of the basin water and to the thickness of the oxide films on the aluminium components.
The corrosion rack was immersed in the RR-8 fuel storage basin, and interim inspections were conducted after 6 and 12 months. The basin is lined with stainless steel and has aluminium storage racks. The purification system uses ion exchange filters. A uniform surface oxide with no pitting corrosion was observed during these two inspections. Subsequently, rack 1 was withdrawn at periodic intervals, disassembled and photographed up to a total exposure time of 1254 days. The coupons were weighed, examined, reassembled and immersed again.