Test Plan to Update SRS HLW Tank Material Properties Database by Determining Synergistic Effects of Dynamic Strain Aging and Stress Corrosion Cracking

摘要

The structural integrity of High Level Waste (HLW) tanks is defined by the demonstrated confinement of the waste by the tank structure under design basis conditions. The validity of a structural integrity assessment depends on the availability of a reliable mechanical and corrosion property database and require application of contemporary fracture analyses. In addition, accurate characterizations of the active degradation/corrosion mechanisms are necessary to ensure structural integrity throughout the intended life of the HLW tanks. A complete mechanical and corrosion property database will provide the foundation for a robust structural integrity assessment. The focus of the proposed work was to quantify the degradation mechanisms and the effect of dynamic strain aging (DSA) on the mechanical properties and degradation mechanisms, particularly stress corrosion cracking(SCC), in low carbon steel that is reflective of tank material. A comprehensive test plan is presented here to develop a mechanical and corrosion properties database to develop a fundamental understanding of the synergistic effects of DSA and SCC due to high temperature service of the HLW tanks.