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Influence of Residual Stresses in the Cladding Zones of RPV WWER-1000 on Integrity Assessment

  • Oleh Makhnenko
  • Elena KostenevichEmail author
Conference paper
Part of the Structural Integrity book series (STIN, volume 8)

Abstract

One of the current problems of the structural integrity assessment of the reactor pressure vessel WWER-1000 is the determination of resistance to brittle fracture taking into account the residual stresses after cladding of the protective anticorrosion layer and heat treatment. Existing data on the residual stresses do not take into account possible microstructural transformations in the base material steel 2.5Cr-Mo-V (15H2NMFA). Mathematical modeling of residual stresses taking into account microstructural phase transformations determines a compression stress area in the heat affected zone of the base material as result of martensite formation. These results were confirmed by dilatometric analysis and metallography of the steel 15H2NMFA templates. The evaluation of resistance to brittle fracture under the thermal shock load showed, that calculated compression residual stresses in the base material HAZ reduce value SIF for cracks of a depth up to 7 mm.

Keywords

RPV Nozzle zone Cladding Thermal shock Brittle fracture SIF 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.The E. O. Paton Electric Welding InstituteKievUkraine

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