[PDF] Top 20 Application of a Finite Element Method to Leak Before Break(LBB) of a Heat Exchanger (G587)

... The leak before break(LBB) concept is difficult to apply to a structure with a thin tube that is immersed in a water ...an application of the LBB concept to a heat exchanger in a nuclear power ... See full document

... fuel element assembly is inserted and through which the coolant ...and application of leak before break (LBB) for these tubes with DHC was ... See full document

... A finite element model which utilizes the extended finite element method (XFEM) to model leaks through cracks is presented in this ...in Leak-before-Break analysis. ... See full document

... Smoothed Finite Element Method (SFEM) was introduced by application of the stabilized conforming nodal integration in the conventional nite element ...this method, integration is ... See full document

... Structure of this paper can be summarized as follows. Section  overviews some related methods briefly. In Section  we express the model problem as an inequality and Laplacian constrained variational optimization ... See full document

... that leak detection systems installed at the CANDU plants are more sensitive compared to those at other types of nuclear plants as a result of the costs associated with upgrading of heavy water and the presence of ... See full document

... The finite element method is a numerical solution ...This method becomes popular over the last ...the finite element method (FEM) for the modeling of the complex ...This ... See full document

... The limitation of the two flux model is that only the propagation of diffuse intensities, but not of a collimated source can be described, because the loss of intensity of the collimated beam due to scattering will not ... See full document

... The LBB concept was used for the Main Vessel (MV) and pipings of the SPX ([12] to [14]) and PHENIX plants. As far as the MV is concerned, the LBB approach has been applied to verify the absence of risk as regards the ... See full document

... The test specimen is filled with water introducing a cover gas space in the upper portion of the straight vertical pipe attached with the Tee. By connecting the cover gas space to the constant nitrogen pressure tanks, ... See full document

... If the piping system fails to satisfy either the Level 1 acceptance criteria or all of the elements of the Level 1 specific screening criteria, the applicant’s next logical step would be to try to demonstrate LBB using ... See full document

... The leak-before-break (LBB) analysis of pressurized piping and vessels, which is developed during the past three decades, is an important rule for assessing pressure vessels,especially nuclear ...of ... See full document

... Leak-before-break (LBB) has been widely accepted as a technical approach to eliminate pipe- whip restraints and jet-impingement shields in many nuclear power plants (NPPs). Concerns related to the ... See full document

... dam- break problem is ...(CBS) finite element ...the finite difference method for the incompressible Navier-Stokes ...the finite element discretization in introducing ... See full document

... Abstract: Finite element method is a popular computer aided numerical method based on the discretisation of the domain, structure or continuum into number of elements and obtaining the ...a ... See full document

... The use of Leak Before Break (LbB) arguments is well established in the nuclear industry. A 'detectable leakage' LbB procedure, similar to that of NUREG 1061, is commonly used. Such a procedure is ... See full document

... assessment method applicable to thin wall pipes with large diameter made of modified 9Cr-1Mo steel [4] based on the conventional GE/EPRI method ...Parametric finite element analyses (FEA) were ... See full document

... Further improvements are foreseen in order to calculate thoroughly the COA, at internal and external sides, and by considering inelastic deformations. Recent development of eXtended Finite Element ... See full document

... characteristic method in time was analyzed. As for higher order characteristic method in time, Rui and Tabata 12 used the second order Runge-Kutta method to approximate the material derivative term ... See full document

... (leading to mass conservation and flux continuity) and in particular the approach from [39] for a posteriori error estimates in mixed methods without flux continuity. We first build a flux reconstruction that is globally ... See full document