%A"Phythian, W J" %A"Dumbill, S" %A"Brown, P" %A"Sinclair, R [AEA Technology, Harwell (United Kingdom)]" %D1993 %I; Nuclear Energy Agency, 75 - Paris (France). Committee on the Safety of Nuclear Installations %2 %J[] %K36 MATERIALS SCIENCE, STEELS, COPPER, PHYSICAL RADIATION EFFECTS, AGE HARDENING, CHEMICAL COMPOSITION, EMBRITTLEMENT, MECHANICAL PROPERTIES, MICROSTRUCTURE, NEUTRON FLUENCE, PRECIPITATION, PRESSURE VESSELS, SMALL ANGLE SCATTERING, STABILITY, TRANSMISSION ELECTRON MICROSCOPY, WELDED JOINTS %PMedium: ED; Size: pp. 1-8 %TStability of thermally induced copper precipitates under neutron irradiation %XModel Fe 1.3%Cu and Fe 1.3%Cu 1.1%Ni alloys have been thermally aged at 550 C for 2 hours (peak) and 10 hours prior to irradiation at 288 C to a dose of 5.10{sup 22} n/m{sup 2}. Results of a microstructural investigation using dedicated field emission gun scanning transmission electron microscopy (FEGSTEM) and small angle neutron scattering (SANS) to assess precipitate stability in the binary alloy, are presented. These data are then used to predict a hardness change as a result of copper precipitation for comparison with the measured values obtained using standard 5 kg Vickers hardness tests on the SANS samples. Implications of these data to the re-embrittlement of the RPV by subsequent copper precipitation is discussed. (authors). 16 refs., 5 figs., 5 tabs. %0Conference %NNEA-CSNI-R-94-1; CONF-9309237-;Other: ON: DE97620233; TRN: XN9600151029676 %1 %CNEA %Rhttps://doi.org/ Other: ON: DE97620233; TRN: XN9600151029676 INIS %GEnglish