|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||The ATR-2 RPV Steel Irradiation Hardening Data Base: An Overview and Some Major Findings
||Nathan Almirall, Peter Wells, Takuya Yamamoto, David Gragg, Kirk Fields, G. R. Odette, Randy Nanstad, Keith Wilford, Tim Williams
|On-Site Speaker (Planned)
The UCSB ATR-2 irradiation experiment has generated a new database on a large matrix of RPV steels to fill a critical gap in predicting high fluence embrittlement for plant operation up to 80 years. One focus is on high volume fractions of intermetallic Mn-Ni-Si precipitates (MNSP), dubbed late blooming phases, which make large and previously unexpected contributions high fluence embrittlement. Key new insight on dose rate effects is also provided by ATR-2, in conjunction with other UCSB and surveillance databases, that span a large range of flux, fluence and irradiation temperature conditions. Various mechanical property and microstructural characterization tools are used to map irradiation effects on the constitutive properties, as well as the volume fractions, number densities, sizes, compositions and structures of the precipitates that form under irradiation. The resulting database is serving as the foundation for the development of a physically based predictive model of high-fluence, low-flux embrittlement.
||Planned: Supplemental Proceedings volume