Community Research and Development Information Service - CORDIS

Abstract

The number of Reactor Pressure Vessels (RPVs) approaching designed end-of- life conditions have been annealed in recent years by means of thermal treatment. After the annealing, the RPV is subjected to re-embrittlement.

Re-embrittlement after annealing kinetics needs to be thoroughly understood in order to predict future component behaviours and plant life management.

Within the frame of the scientific co-operation between Kurchatov Institute and the JRC Institute for Advance Materials the evaluation of available WER-440 re- embrittlement data have been carried out.

The data have been analysed and compared to available prediction models: e.g. lateral shift, conservative model, etc. Such models are based on the assumption that the re-embrittlement kinetics after annealing can be predicted by similitude behavior with the primary embrittlement.

The data analysed in this paper are showing that none of such available models satisfactory explains the kinetics of re-embrittlement; in particular during the early re-embrittlement phase. In this phase in fact, the data, in terms of transition temperature shifts, are always much lower than prediction.

During the next phase, the data are rapidly increasing to align with lateral shift model.
From the mechanism point of view, there are several reasons that could explain such behavior. During the primary embrittlement in fact, Copper, together with other elements, is known to precipitate. Precipitation mechanism, inducing embrittlement, continue until saturation. aturation.

Additional information

Authors: KRYUKOV A, RRC-KI, Moscow (RU);ERAK D, RRC-KI, Moscow (RU);SHTROMBAKH Y, RRC-KI, Moscow (RU);DEBARBERIS L, JRC-IAM, Petten (NL);AHLSTAND R, JRC-IAM, Petten (NL);VALO M, JRC-IAM, Petten (NL);KOHOPAA J, VTT (FI);VODENICHAROV S, FORTUM (FI)
Bibliographic Reference: An oral report given at: IAEA Experts Meeting . Sponsored by: IAEA. Held in: Gloucester, 14-17 May 2001
Record Number: 200013613 / Last updated on: 2001-07-30
Category: PUBLICATION
Original language: en
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top