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Experimental Studies of Copper, Phosphorus and Nickel Effect on RPV Model Alloys at two different fluences.

Funded under: FP5


The influence of Copper, Nickel and Phosphorus on the irradiation embrittlement of Reactor Pressure Vessel (RPV) steels can be qualitatively studied by using different Model Alloys containing parametric variations of the elements.

A joint project on RPV model alloys is currently undertaken by the Institute of Advance Materials of the Joint Research Centre (JRC IAM) of the European Commission in Petten, the Netherlands, and the Russian Research Centre "Kurchatov Institute" (RRC KI) in Moscow.

Up to 33 different model alloys, representing typical RPV steels chemical composition have been irradiated in the LYRA irradiation facility of the High Flux Reactor (HFR), Petten, and are presently under investigation. Some of the model alloys have been irradiated in surveillence channels of Russian Nuclear Power Plants (NPPs).

The analysis of the available results on 7 different model alloys Charpy specimens already irradiated at two difference fluences is reported in this paper. Additional non-destructive testing is also described.

The results are showing that the chemistry factor as defined by the Russian Guide, which only takes into account Copper and Phosphorus, is a good parameter which correlates well to the transistion temperature shift of Model Alloys for different Nickel contents.

The general conclusion is that it is feasible to extend the chemistry factor in order to account for Ni and as a consequence to improve the Russian Guide in order to predict RPV embrittlement for high Ni contained steels. d steels.

Additional information

Authors: DEBARBERIS L, IAM HFR Unit, Petten (NL);SEVINI F, IAM HFR Unit, Petten (NL);KRYUKOV A, IAM HFR Unit, Petten (NL);T÷RR÷NEN K, IAM Director, Petten (NL);ACOSTA B, JRC Petten, HFR Unit (NL);NIKOLAEV Y, KURCHATOV Institute, Russian Federation, Moscow (RU)
Bibliographic Reference: Article: Journal of Nuclear Materials
Availability: Journal of Nuclear Materials
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