NSUF 24-5108: Microstructural Characterization of Pressurized Water Reactor Harvested Core Barrel Weld Materials

The objective of this work would be to perform detailed microstructural characterization of austenitic stainless-steel weld (ASSW) materials from the Ringhals 2 core barrel. Specimens of Type 308 stainless steel weld metal with doses 0, 2.4, and 4.1 dpa will be examined. Irradiation of these materials is expected to include microstructural features such as dislocations, radiation-induced segregation and precipitations with size ranging from few nanometers to few tens of nanometers. The detailed high-resolution characterization would help improve understanding of the microstructural evolution of ASSW materials as dose increases, and to understand the effects of thermal aging only versus thermal aging plus neutron irradiation, since a specimen with essentially no dose will be included. The methods used would include transmission electron microscopy (TEM) and atom probe tomography (APT). The results of this work will help to understand how microstructural changes relate to mechanical property changes, such as tensile properties and fracture toughness, that will be determined through macro-scale testing performed through the SMILE program. This work also complements work that would be performed under a separate RTE proposal using the same materials, which would perform micro-mechanical testing.

추가 정보

필드	값
Award Announced Date	2024-09-23T12:11:07.037
Awarded Institution	Nuclear Regulatory Commission
Facility Tech Lead	Alina Montrose
Irradiation Facility
PI	Jeffrey Poehler
PI Email	[email protected]
Project Type	RTE
RTE Number	None