High thermal efficiency of Compact Heat Exchangers (CHX) makes them distinctly utile for application to Next Generation Nuclear Plants (NGNPs). The high temperature application and transient conditions of NGNP operation induce stresses in CHX. These induced stresses can be categorized under different classifications based on their cause and modes of failure. ASME Sec III Div 5 has different analysis methodologies based on failure modes, failure criteria to be assessed, and constitutive relationship considered. Primary objective of this study is to provide a description of classification of stresses in CHX and conduct analysis to justify the classification. Further, evaluation of CHX design is conducted according to simplified analysis methodologies in ASME Sec III Div 5: Elastic and Simplified Inelastic Analysis. These simplified analysis are performed following the submodeling technique. At global level, channeled core is replaced by elastic orthotropic core. At local level, the stresses and strain for critical regions following the simplified analysis methods. For Elastic Analysis Method, stresses in critical sections in CHX are checked for thermomechanical cycle against the HBB-T-1320 of ASME Sec III Div 5 criteria. For Simplified Inelastic Analysis, critical sections are analyzed for strain limits, ratcheting strain and creep stress following HBB-T-1330 of ASME Sec III Div 5. The analysis outcomes are compared and results are discussed.


Assessment of Compact Heat Exchanger Design According to the Simplified Asme Analysis Methodologies

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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