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FP5

Irradiation Effects on the Evolution of the Microstructure, Properties and Residual Stresses in the Heat Affected Zone of Stainless Steel Welds (INTERWELD)

Project ID: FIKS-CT-2000-00103
Funded under: FP5-EAECTP C

Abstract

Test welds of SS type 304 and SS type 347 have been produced with weld residual stresses, microstructure and properties representative for core shroud application. These welds have been characterised for weld residual stress state prior to irradiation by destructive (ring core) and non-destructive (neutron and X-ray diffraction) methods. Stripes/slices and test specimens of the test weld were irradiated in two capsules to two relevant neutron dose levels: one under, 0.3 dpa, and one over, 1.0 dpa, the threshold value, about 0.5 dpa, indicated for irradiation assisted stress corrosion cracking in BWRs.
The in-service weld of the decommissioned BR-3 reactor is used to compare the results from the test weld with real internal component material. The irradiated materials have been distributed to the different partners to perform the post-irradiation test and examination. The weld residual stresses are measured by neutron diffraction on the low and high dose level test weld stripes and stripes from the unirradiated and irradiated in-service material. The corrosion behaviour of the material is determined by EPR tests (Note: EPR is not performed in BWR environment) and CERT in BWR and inert environment. The (micro) mechanical properties have been determined both on irradiated test specimens and specimens taken from the irradiated coupons and in-service material. The microstructure and microchemistry of the weld, heat affected zone and plate structure have been examined by optical, SEM, TEM, EPMA, STEM-EDX, SIMS and AUGER techniques.

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