NDLI: The Brittle Strength Assessment of WWER-1000 Reactor Pressure Vessel Nozzle With Cladding

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Oryniak, Andrii Radchenko, Sergii Orynyak, Igor
Copyright Year	2013
Abstract	Brittle strength calculation of RPV nozzle is the central point of the integrity assessment of the reactor pressure vessel when extending its life. The important part of this calculation is a determination of the stress intensity factor, SIF, for the postulated crack of partly elliptical form in a nozzle under inner pressure, bending moments (from the main circulating pipe) and difference of temperatures. In this paper we use method of influence functions as the most convenient one for solution of similar tasks. Eight basic laws of the crack surface loading are introduced which account for real stress distribution in the depth and length direction of a crack including the jump of stress between cladding and main metal due to the difference in the thermal expansion factors. To determine the dimensionless SIF under chosen laws of loading were developed the FEM models of nozzle with crack of different ratios of axes. For all possible modes (regimes) of operation were carried the detailed calculations of the temperature field in the nozzle, which were used later for determining the stress state at each time point. The stress field defined in 120 discrete points of the crack surface was treated by the method of least squares for the presention as a linear combination of eight basic load laws with defined coefficients. The procedure for determination of the temperature brittle strength margin which employs the presentation of critical values of SIF (fracture toughness) in the exponential function form is described.
Sponsorship	Pressure Vessels and Piping Division Nondestructive Evaluation Engineering Division
File Format	PDF
ISBN	9780791855676
DOI	10.1115/PVP2013-97561
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2013 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2013-07-14
Publisher Place	Paris, France
Access Restriction	Subscribed
Subject Keyword	Stress concentration Temperature Reactor vessels Metals Fracture (materials) Brittleness Finite element methods Pressure Stress Fracture toughness Thermal expansion Finite element model Nozzles Pipes Cladding systems (building)
Content Type	Text
Resource Type	Article

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