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A radiation-sensitive reactor pressure vessel (RPV) weld with intentionally enhanced copper, nickel, and manganese content, designated KS-Ol, is characterized in terms of static initiation (Ki,, KJ,) and Charpy impact toughness in the unirradiated and irradiated conditions. After neutron irradiation to a fiuence ofO.8 x 1Oi9 neutronlcm-2 (E > 1 MeV) at a temperature of288 OC, this weld exhibited a large Charpy T4iJ shift of 169 K, a large shift ofthe fracture toughness transition temperature of 165 K, a decrease in upper shelfenergy (USE) from 118J to t-78 J, and an increase in the yield strength from 600 to 826 MPa, Atom probe tomography revealed a high number density (-"3 × 1024 m'3) of Cu-, Mn-, Ni-, Siand P-enrichedprecipitates and a lower number density (・-1 × l 023 m-3) ofP clusters,

ICONE11-36490 EFFECT OF RADIATION ON FRACTURE TOUGHNESS AND MICROSTRUCTURE OF A HIGH-Cu RPV WELD