VALIDATION OF ACE ANALYTICAL CRITERION FOR WARM PRE-STRESS EVALUATION IN RPV INTEGRITY ASSESSMENT

摘要

Numerous experimental and numerical studies have been conducted in France to demonstrate the beneficial effect of warm pre-stress (WPS) on the brittle fracture resistance of reactor pressure vessel (RPV) steels and take into account this effect in French RPV integrity assessment. A large panel of experimental data is available, obtained on small, medium and large scale specimens. These data have been included in a specific EDF WPS experimental database. An analytical criterion - ACE criterion - is proposed by French organizations (AREVA, CEA and EDF) for analytical evaluation of warm pre-stress effect on the brittle resistance of RPV steels. After a description of ACE criterion and the EDF WPS database, the validation of the criterion is shown - based on this database - by comparison between experimental results and predictions of the model.