SYMPOSIA PAPER Published: 01 January 1999

Comparison of Different Experimental and Analytical Measures of the Thermal Annealing Response of Neutron-Irradiated RPV Steels


The thermal annealing response of several materials as indicated by Charpy transition temperature (TT) and upper-shelf energy (USE), crack initiation toughness, KJc, predictive models, and automated-ball indentation (ABI) testing are compared. The materials investigated are representative reactor pressure vessel (RPV) steels (several welds and a plate) that were irradiated for other tasks of the Heavy-Section Steel Irradiation (HSSI) Program and are relatively well characterized in the unirradiated and irradiated conditions. They have been annealed at two temperatures, 343 and 454°C (650 and 850°F) for varying lengths of time. The correlation of the Charpy response and the fracture toughness, ABI, and the response predicted by the annealing model of Eason et al. for these conditions and materials appears to be reasonable. The USE after annealing at the temperature of 454°C appears to recover at a faster rate than the TT, and even “over-recovers” (i.e., the recovered USE exceeds that of the unirradiated material).

Author Information

Iskander, SK
Oak Ridge National Laboratory, Oak Ridge, TN
Sokolov, MA
Oak Ridge National Laboratory, Oak Ridge, TN
Nanstad, RK
Oak Ridge National Laboratory, Oak Ridge, TN
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Developed by Committee: E10
Pages: 403–420
DOI: 10.1520/STP13878S
ISBN-EB: 978-0-8031-5395-0
ISBN-13: 978-0-8031-2614-5