Abstract
The results of Charpy V-notch surveillance testing of ferritic steels from the High Flux Isotope Reactor pressure vessel revealed significant radiation-induced embrittlement in A212 grade B, A350 grade LF3, and A105 grade II steels. The steels were irradiated at about 50°C for about 17.5 effective full-power years at a neutron flux ( E > 1MeV) of 10 12 to 10 13 n m −2 s −1 to fluences of 10 21 to 10 22 n m −2. These fluences are only about one-tenth those required to cause the same embrittlement in the higher flux (~10 17 n m −2 s −1) environments of test reactors. The findings suggest that the degree of embrittlement per unit fast fluence is increased at low neutron flux. Changes in neutron energy spectrum may be involved, too. Potential mechanisms for effects of neutron flux and neutron spectrum on embrittlement are discussed.
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