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1996 Feb. 1 BACKGROUND L L L L P P P P P RBOF RBOF RBOF RBOF RBOF Date Exposure (d) 25 CHAPTER 1 (a) (b) (c) (d) Standard alloy — circular disc; Welded alloy — circular disc; Galvanic couples — circular discs with a 4:1 cathode to anode area ratio; Crevice — pairs. On the basis of the current inventory of fuel in the RBOF and the information about incoming research reactor fuel, alloys 1100, 6061 and 5086 are the main fuel cladding alloys expected to be stored in the basin. The welded and galvanic coupons will be mainly 1100 and 6061.

The coupons were disassembled and photographed during the intermediate inspection. Unlike the coupons received at the Budapest RCM, which had only a machined surface finish, these highly polished coupons showed no deep pits or crevice corrosion. 5–16 µS/cm, with a chloride ion content of less than 2 ppm. The excellent corrosion resistance of these coupons was attributed primarily to the surface finish and the improved purity of the water. 6. Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan Rack 1 was inserted on 12 November 1996 and was withdrawn for a short time on a monthly basis for visual inspection.

No localized attack was observed in these passivated areas of the coupon. Additional coupons were withdrawn from the K and L Reactor basins and from the RBOF in January 2000. After more than four years of exposure, the coupons were generally oxidized and discoloured, but no unexpected pitting was observed. A few coupons from the RBOF showed shallow pits due FIG. 7. Possible biofilm passivation on aluminium top external surfaces. 28 BACKGROUND to embedded iron particles. As expected, the galvanic couples showed some crevice corrosion within the stainless steel–aluminium couples and a slight increase in corrosion products on the aluminium–aluminium crevice coupons.

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