Heavy-Section Steel Irradiation Program. Semiannual progress report, April--September 1990: Volume 1, No. 2
- Oak Ridge National Lab., TN (United States)
The primary goal of the Heavy-Section Steel Irradiation (HSSI) program is to provide a thorough, quantitative assessment of the effects of neutron irradiation on the material behavior, and in particular the fracture toughness properties, of typical pressure vessel steels as they relate to light-water reactor pressure-vessel integrity. The program includes the direct continuation of irradiation studies previously conducted within the Heavy-Section Steel Technology program augmented by enhanced examinations of the accompanying microstructural changes. Effects of specimen size, material chemistry, product form and microstructure, irradiation fluence, flux, temperature and spectrum, and post-irradiation annealing are being examined on a wide range of fracture properties. During this period detailed statistical analyses of the fracture data on K{sub lc} shift of high-copper welds revealed greater shifts in fracture toughness than in Charpy transition temperatures. Testing of the duplex specimens from the second phase of the irradiated crack arrest testing on high-copper welds was initiated. Short-term aging studies were conducted on stainless steel weld-overlay cladding. Additional determinations were made of chemistry and unirradiated RT{sub NDT}s of the low upper-shelf weld metal from the Midland reactor and fracture toughness testing begun. An initial model describing the evolution of radiation-induced self-defect/solute clusters and other microstructures was developed and experiments initiated to examine the effects of low-energy, low-temperature neutron irradiations.
- Research Organization:
- Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- Nuclear Regulatory Commission, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10106302
- Report Number(s):
- NUREG/CR-5591-Vol.1-No.2; ORNL/TM-11568-Vol.1-No.2; ON: TI94003646; TRN: 94:000257
- Resource Relation:
- Other Information: PBD: Nov 1993
- Country of Publication:
- United States
- Language:
- English
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