Effect of neutron irradiation on the mechanical properties of an A508 CL2 and 15KH2NMFA irradiated in the NOMAD-3 rig in the BR2 cooling water

    Research outputpeer-review

    Abstract

    The typical operating temperatures of a nuclear reactor pressure vessel in a PWR are between 290°C and 300°C. However, many BWRs and some PWRs operate at slightly lower temperatures down to 260°C. Most of the literature and neutron
    irradiation damage is therefore focused on those irradiation temperatures. It is well-known that the lower the irradiation temperature, the more neutron irradiation damage occurs, because no appreciable annealing happens below approximately
    230°C. The NOMAD_3 irradiation consisted in total of 24 Charpy sized samples from an A508 Cl.2 forging and a 15Kh2NMFA material. They were irradiated to three various fluences between 1.55 and 7.90 x 1019 n/cm² (E>1MeV) at approximately 100°C. The hardening of the A508 Cl.2 was between 260 and 400 MPa which was much higher than the NOMAD_0 properties which
    were irradiated at approximately 280°C. The tensile tests of irradiated materials are all characterized by a significant loss of work hardening capacity leading to plastic flow localization promptly after the yield strength is reached. This affects also the shape of the Charpy impact transition curves. The radiation
    embrittlement derived from Charpy impact tests, ^T41J, is up to 156°C for the highest fluence. For this irradiation, the embrittlement to hardening ratio was also around 0.43 +/- 0.2°C/MPa as it was found in the previous campaign
    NOMAD_0.
    This paper discusses the tensile, hardness and impact properties of the NOMAD_3 irradiation campaign. It is compared to the NOMAD_0 with respect to effect of irradiation temperature and annealing recovery.
    Original languageEnglish
    Title of host publicationProceedings of the ASME 2021 Pressure Vessels & Piping Conference
    PublisherASME - The American Society of Mechanical Engineers
    ChapterV001T01A024
    Pages1-12
    Number of pages12
    EditionPVP2021
    ISBN (Print)9780791885314
    DOIs
    StatePublished - 12 Jul 2021

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