Abstract
AbstractHigh energy neutron radiation causes the embrittlement of reactor pressure vessel (RPV) materials. Magnetic parameter changes were measured by ferromagnetic resonance (FMR) and impedance spectroscopy for steel surveillance specimens of a Mn–Mo–Ni low alloy high copper weld which were irradiated for 5.08 and 15.49 effective full power years in a commercial light water reactor (LWR), respectively. Their dose levels were in the range of 1.23 × 1019 to 3.94 × 1019 n/cm2. The resonance field of FMR signal increased as the neutron dose is increased. Linewidth (ΔH) increased predominantly in the neutron irradiation. In the complex susceptibility spectra, the initial permeability decreased and the relaxation frequency of the permeability μ″ shifted to higher frequencies with an increase of the dose levels. Both magnetic methods show consistent results with each other for the assessment of radiation embrittlement. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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