Reaction of corroded steel coupons with radionuclides (KM)

PI: Katherine Morris, University of Manchester.

Iron metal is an inherent component within the nuclear fuel cycle and over extended timescales, it will corrode to produce both reducing conditions and a range of iron (II/III) bearing oxides. In radioactive waste storage and disposal steel containers will be used to store a range of wastes which will contain heterogeneous materials and may be grouted. In addition, iron metal or “zero valent iron (ZVI)” is proposed as a treatment for radioactively contaminated land. Here, nanoparticulate ZVI is introduced to the contaminated subsurface and allowed to corrode and react with mobile radionuclides such as U(VI) and Tc(VII). Here, we will explore reaction of U(VI) and Np(V) with corroded steel coupons under a range of solution chemistries to explore: (i) the nature of the corrosion products; (ii) the distribution of radionuclides on the corroded steel surface; and (iii) the relationship between radionuclide distribution and speciation and  the different iron corrosion products.