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Abstract

The affect of fluence rate on irradiation embrittlement is a key issue for the correct extrapolation of accelerated tests to surveillance program results. The results obtained are sometimes contradictory due to the large differences of materials used and the large variations of other field parameters, including spectrum, fluence, temperature and their gradients.

The Model alloys project was defined to study the influence of chemical composition on embrittlement. And the results obtained can also be investigated to evaluate the effect of fluence rate.

A systematic parametric study of the response to neutron irradiation of 32 different model alloys with parametric variation of elements (Ni from 0.004 to almost 2 wt%, P from 0.001 to 0.039 wt%, Cu from 0.005 to almost 1 wt%) has then recently been completed in the frame of the European Network AMES and the related European Commission institutional project. The irradiation of the 32 model alloys took place in the LYRA rig at the High Flux Reactor (HFR) of the Joint Research Centre, Petten (NL).

Six of the model alloys were also irradiated at different fluence rates in commercial reactors, namely in Rovno Nuclear Power Plant (NPP), Ukraine, and Kola NPP in Russia. The comparison among the results obtained is presented in this paper. aper.

Additional information

Authors: SEVINI F, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);DEBARBERIS L, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);ACOSTA B, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);VALO M, VTT Manufacturing Technology (FI);KRYUKOV A, RRC-KI, Moscow (RU);BALLESTEROS A, Tecnatom, Madrid (ES)
Bibliographic Reference: An oral report given at: Workshop on Dose Rate Effects in Reactor Pressure Vessel Materials. Organised by: Electric Power Research Institute (EPRI) (US). Held in: Squaw Creek (US), 12-14 November 2001.
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