U.S. Department of EnergyOffice of Scientific and Technical Information
Microstructural and Microchemical Characterization of Primary-Side Cracks in an Alloy 600 Nozzle Head Penetration and its Alloy 182 J-Weld from the Davis-Besse Reactor Vessel
Abstract
Cracks in Alloy 600 and Alloy 182 upper-head-penetration welded components from the Davis-Besse pressurized-water reactor were characterized by high-resolution analytical transmission electron microscopy. Axial cracks in the Alloy 600 nozzle and both axial and circumferential cracks in the weld metal were examined at scales ranging from mm to less than 1 nm. Despite different metallurgical structures in the wrought nozzle and weld alloys, the observations in both materials revealed characteristic penetrative intergranular attack and corrosion products indicating that the degradation occurred by intergranular stress corrosion cracking (IGSCC) during service. Sulfur impurities and sulfide particles found near crack tips in the Alloy 600 nozzle also indicated that the IGSCC in this material was assisted by impurities from the primary-water environment.
- Authors:
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 948776
- Report Number(s):
- PNNL-SA-45694
AF3510000; TRN: US0901708
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Conference
- Resource Relation:
- Conference: 12th International Conference on Environmental Degradation in Materials in Nuclear Systems - Water Reactors, 567-578
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ALLOYS; CORROSION PRODUCTS; IMPURITIES; NOZZLES; PWR TYPE REACTORS; REACTOR VESSELS; STRESS CORROSION; SULFIDES; SULFUR; TRANSMISSION ELECTRON MICROSCOPY; WATER
Citation Formats
Thomas, L, Johnson, Bradley R, Vetrano, John S, and Bruemmer, Stephen M. Microstructural and Microchemical Characterization of Primary-Side Cracks in an Alloy 600 Nozzle Head Penetration and its Alloy 182 J-Weld from the Davis-Besse Reactor Vessel. United States: N. p., 2005.
Web.
Thomas, L, Johnson, Bradley R, Vetrano, John S, & Bruemmer, Stephen M. Microstructural and Microchemical Characterization of Primary-Side Cracks in an Alloy 600 Nozzle Head Penetration and its Alloy 182 J-Weld from the Davis-Besse Reactor Vessel. United States.
Thomas, L, Johnson, Bradley R, Vetrano, John S, and Bruemmer, Stephen M. 2005.
"Microstructural and Microchemical Characterization of Primary-Side Cracks in an Alloy 600 Nozzle Head Penetration and its Alloy 182 J-Weld from the Davis-Besse Reactor Vessel". United States.
@article{osti_948776,
title = {Microstructural and Microchemical Characterization of Primary-Side Cracks in an Alloy 600 Nozzle Head Penetration and its Alloy 182 J-Weld from the Davis-Besse Reactor Vessel},
author = {Thomas, L and Johnson, Bradley R and Vetrano, John S and Bruemmer, Stephen M},
abstractNote = {Cracks in Alloy 600 and Alloy 182 upper-head-penetration welded components from the Davis-Besse pressurized-water reactor were characterized by high-resolution analytical transmission electron microscopy. Axial cracks in the Alloy 600 nozzle and both axial and circumferential cracks in the weld metal were examined at scales ranging from mm to less than 1 nm. Despite different metallurgical structures in the wrought nozzle and weld alloys, the observations in both materials revealed characteristic penetrative intergranular attack and corrosion products indicating that the degradation occurred by intergranular stress corrosion cracking (IGSCC) during service. Sulfur impurities and sulfide particles found near crack tips in the Alloy 600 nozzle also indicated that the IGSCC in this material was assisted by impurities from the primary-water environment.},
doi = {},
url = {https://www.osti.gov/biblio/948776},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 23 00:00:00 EDT 2005},
month = {Thu Jun 23 00:00:00 EDT 2005}
}