AGR Cladding Corrosion:Investigation of the Effect of Temperature on Unsensitized Stainless Steel

Howett, Elizabeth and Boxall, Colin and Hambley, David (2017) AGR Cladding Corrosion:Investigation of the Effect of Temperature on Unsensitized Stainless Steel. MRS Advances, 2 (11). pp. 615-620. ISSN 2059-8521

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Abstract

The corrosion of unirradiated and unsensitized Advanced Gas-cooled Reactor cladding material, 20/25/Nb stainless steel, was studied as a function of temperature and [Cl-] typical of those found in interim spent fuel storage pond waters. With respect to preventing corrosion, it found to be advantageous to dose the ponds to pH≈11.4. At pH lower than 7, the initiation of pitting is observed at ∼0.4V vs Ag/AgCl, an undesirable condition as pits are considered to be initiators of stress corrosion cracking (SCC) which may contribute to loss of cladding integrity during storage. Such pits are not seen at a pH 11.4 for the expected and projected pond operating temperatures of 24-60°C. There generally appears to be no localised corrosion threat to cladding as the temperature is increased in this range, although substantial pit formation is observed at the extreme maloperation temperature of 90°C at pH 11.4 indicating a loss of protection.

Item Type:
Journal Article
Journal or Publication Title:
MRS Advances
ID Code:
129673
Deposited By:
Deposited On:
16 Dec 2019 14:00
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 05:35