Moessbauer Spectroscopy on Nuclear Power Plant Materials

摘要

Experimental results of original irradiated reactor pressure vessel surveillance specimens are presented and discussed in the paper. In 1994, the new "Extended Surveillance Specimen Program for Nuclear Reactor Material Study" was started in collaboration with the nuclear power plant (NPP) Bohunice and NPP Research Institute Trnava (Slovakia). Three batches of special prepared "Moessbauer samples" (after 1, 2 and 3 years stay in irradiation channels) were measured and interpreted using the new four components approach of Moessbauer spectra evaluation with the aim to observe microstructural changes due to thermal and neutron treatment resulting from operating conditions in NPP. The systematic changes in the relative areas of Moessbauer spectra components were observed and discussed.