| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Microstructural Characterization of the Through-wall Thickness Pressure Vessel Weldment of the Zion NPP |
| Author(s) |
Philip Edmondson, Thomas M Rosseel, Mikhail Sokolov |
| On-Site Speaker (Planned) |
Philip Edmondson |
| Abstract Scope |
Recently, material from the decommissioned Zion nuclear power plant Unit 1reactor pressure vessel (RPV) has become available for microstructural characterization. This unit operated from 1973-1998 and was exposed to service irradiation for approximately 13.7 effective full power years (EFPYs). Of particular interest is the circumferential beltline weld – a high Cu, high Ni Linde-80 composition that was exposed to a peak neutron fluence of ~0.75x1019 n.cm-2. In this presentation, atom probe tomography of several samples taken from different placements throughout the thickness of the RPV weld ranging from the inside to outside walls to investigate the role of neutron energy attenuation on the formation of Cu-rich and Ni-Mn-Si precipitates. This characterization will focus on the variance in composition, size and number densities of the precipitates throughout the RPV wall and place these variances into the context of mechanical property changes especially the change in ductile to brittle transition temperatures (DBTT). |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |