A course on Advanced Simulation in Thermal Hydraulics NPP System Code RELAP5/SCDAP

RELAP5 (Reactor Excursion and Leak Analysis Program) is the most widely used Nuclear Power Plant (NPP) system code for thermal and hydraulic analysis of Light Water Reactors (LWRs). The version RELAP/SCDAP with extended part on Severe Core Damage Analysis Program (SCDAP) developed by Innovative Systems Software (ISS) is used in more than 30 countries in the world for the design and safety analysis of power and research reactors, advanced fluid systems, and experiments. The capabilities and salient features of the software include: (a) it is a state-of-the-art tool to simulate wide range of design basis and severe accidents (b) its point reactor kinetic model enables coupled behavior of the reactor coolant system and reactor core during severe accidents as well as large and small break loss-of-coolant accidents, and (c) it offers the capability of addition of new coolants for advanced reactor and fluid systems by implementing fluid properties and correlations in the code. The course will focus on:

• General and advanced users tutorials for steady-state and transient analyses of research and power reactors
• Investigation of thermal-hydraulic response of the plant systems under anticipated transients and design basis accidents
• Modeling phenomenological problems and natural circulation passive safety system and its evaluation in removing decay heat in integral type PWRs
• Thermal-hydraulic coupling of containment and primary system during accidents
• Investigation of severe core damage, and sensitivity analysis of different core degradation parameters and models to study their effect on severe core damage progression
• Modeling new coolants in RELAP5 for thermal-hydraulics analysis of advanced SMRs and Gen-IV reactors

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