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Junlin Huang,Derek Lister,Shunsuke Uchida,Lihui Liu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
Clogging of sump strainers that filter the recirculation water in containment after a loss-of-coolant accident(LOCA) seriously impedes the continued cooling of nuclear reactor cores. In experiments examiningthe corrosion of aluminium alloy 6061, a common material in containment equipment, in boratedsolutions simulating the water chemistry of sump water after a LOCA, we found that Fe-bearing intermetallicparticles, which were initially buried in the Al matrix, were progressively exposed as corrosioncontinued. Their cathodic nature vis- a-vis the Al matrix provoked continuous trenching around themuntil they were finally released into the test solution. Such particles released from Al alloy components ina reactor containment after a LOCA will be transported to the sump entrance with the recirculation flowand trapped by the debris bed that typically forms on the strainer surface, potentially aggravatingstrainer clogging. These Fe-bearing intermetallic particles, many of which had a rod or thin strip-likegeometry, were identified to be mainly the cubic phase ac-Al(Fe,Mn)Si with an average size of about2.15 mm; 11.5 g of particles with a volume of about 3.2 cm3 would be released with the dissolution ofevery 1 kg 6061 aluminium alloy.
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Huang Junlin,Lister Derek,Zhu Xiaoliang,Uchida Shunsuke,Xu Qinglan 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
A method was proposed for in-situ evaluating the thickness and resistivity of the oxide/hydroxide film formed on the surface of aluminum alloy exposed to sump water formed in the containment after a loss-of-coolant accident. The evaluation entailed fitting a model for the film impedance, which has film thickness and other variables describing the resistivity profile of the film along its thickness direction as fitting parameters, to the practically measured electrochemical impedance data. The obtained resistivity profiles implied that the films formed at pHs25°C 7, 8, 9, 10, and 11 all had a duplex structure; compared to the outer layer in contact with the solution, the inner layer of the film had a much higher resistivity and was inferred to be denser and provide most of the protectiveness of the film. Both the thickness and the total resistance of the film decreased with the increasing solution pH25°C, suggesting that the films formed in more alkaline solutions had less protectiveness against corrosion, consistent with the increasing aluminum alloy corrosion rates previously identified.
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