Effects of irradiation temperature on embrittlement of nuclear pressure vessel steels.

摘要

The effects of neutron irradiation on the steel reactor vessel for the modular high-temperature gas-cooled reactor (MHTGR) are being investigated, primarily because the operating temperatures are low (121 to 288(degrees)C (250--550(degrees)F)) compared to those for commercial light-water reactors (LWRs) ((approximately)288(degrees)C (550(degrees)F)). The need for design data on the reference temperature (RT(sub NDT)) shift necessitated the irradiation at different temperatures of A 533 grade B class 1 plates, A 508 class 3 forging, and welds used for the vessel shell, vessel closure head, and vessel flange. This paper presents regular- and mini-tensile, Automated Ball Indentation (ABI), and Charpy V-notch (CVN) impact test results from five irradiation capsules of this program.