| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Progressive Solutions to Improve Corrosion Resistance for Nuclear Waste Storage
|
| Presentation Title |
Using Stress Modelling to Understand Effects of Pit Morphology on Stress Corrosion Cracking Initiation in Austenitic Stainless Steels |
| Author(s) |
Alana Parey, Jay Srinivasan, Rebecca F Schaller, Eric Schindelholz, Jenifer S. Locke |
| On-Site Speaker (Planned) |
Alana Parey |
| Abstract Scope |
During extended nuclear waste storage, chloride-containing brines may form on the surface of austenitic stainless-steel spent nuclear fuel canisters resulting in atmospheric corrosion and possibly stress corrosion cracking. Pit morphology and size depend on the chemistries of these brines which are a function of the local temperature and relative humidity (RH). Under low RH conditions, irregular pitting, crosshatching, and microcracking are present which may affect SCC initiation. This study aims to determine the stress concentration profile surrounding pits of various sizes and geometries, particularly pits with high radius of curvature fissures and microcracks. Through combining experimental data with modelling, pit size and morphology can be compared in terms of their potential to initiate SCC. SCC testing and modelling will be conducted at temperature and RH levels amenable to replicating relevant pit morphologies, gaining insight into crack initiation. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.SAND2021-2878A |