Volume 5, Issue 1 (January 2008)

    Attenuation of Neutron Radiation Damage Through a Simulated RPV Wall

    (Received 24 July 2006; accepted 15 November 2007)

    Published Online: 2008

    CODEN: JAIOAD

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    Abstract

    An experiment has been conducted in which a 180-mm thick reactor pressure vessel (RPV) wall has been simulated using eighteen 10-mm slices and irradiated under test reactor conditions to investigate the through wall attenuation of neutron embrittlement. Attenuation of neutron radiation damage through the wall of an RPV is a process that involves a changing neutron flux spectrum. The effect of the changing spectrum has not been fully studied to define the change in fracture toughness properties through the RPV wall. One low copper content base metal and one high copper content Linde 80 weld metal have been irradiated in various positions through the simulated wall to allow quantification of an improved experimentally-based embrittlement attenuation model. Comparisons are made of predicted attenuation changes in toughness properties with measured fracture toughness and Charpy V-notch results for the high copper content weld metal and the low copper content plate. The predictions of through-wall attenuation follow the practice defined in ASTM E 900-02, in which the attenuation of high energy neutron fluence (E >1 MeV) is projected based upon displacements per atom (dpa) change through the wall thickness. The resultant degree of material damage (Charpy V-notch 41 J transition temperature, T41J) using this dpa-based fluence change is estimated also using the ASTM E 900-02 embrittlement model. The irradiation-induced shift in T41JT41J) is typically assumed to infer the shift in fracture toughness transition temperature to be used for structural integrity assessments for the reactor pressure vessel. This assumption will be checked by measuring Master Curve fracture toughness properties for the high copper content weld metal and the low copper content plate.


    Author Information:

    Server, William
    ATI Consulting, Pinehurst, NC

    Spanner, Jack
    EPRI, NC

    Rosinski, Stan
    EPRI, NC

    Brumovsky, Milan
    Nuclear Research Institute, Rěž, Czech Republic

    Kytka, Milos
    Nuclear Research Institute, Rěž, Czech Republic


    Stock #: JAI100728

    ISSN: 1546-962X

    DOI: 10.1520/JAI100728

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    Author
    Title Attenuation of Neutron Radiation Damage Through a Simulated RPV Wall
    Symposium 23rd Symposium on Effects of Radiation on Materials, 2006-06-15
    Committee E10