Embrittlement correlation methods metal

There are four main types of reactors in France CPO (900MWe), CPY (900MWe), P4 and P 4 (1300MWe) and N4 (1400MWe). The surveillance data from six CPO reactors and 26 CPY reactors as well as the test reactor data, including those obtained after the development of the FIS model, were used for the calibration of a new embrittlement correlation method. The surveillance database includes 139 pieces of base metal data, 130 weld metal data, 131 heat-affected zone (HAZ) data and 93 standard reference material (SRM) data, while the test reactor database contains 36 pieces of... 

In the development of a new correlation method, microstructural characterization of the surveillance materials of some PWR plants was also performed in order to understand the embrittlement mechanism of RPV steels with different Cu contents. At the same time, another test reactor irradiation project, the PLIM project, was also conducted by Japan Nuclear Energy Safety (JNES), where extensive microstructural characterization of base metals and weld metals with a wide range of chemical compositions in terms of Cu and Ni was performed using APT, transmission electron microscopy and positron annihilation to obtain new insights with the embrittlement mechanism at high fluences.The mechanism of embrittlement identified or confirmed in these projects was summarized as follows ... 

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