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ISBN : 978-1-56700-497-7 (Flash Drive)

ISBN : 978-1-56700-496-0

Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)
2019, 28-31 December , IIT Roorkee, Roorkee, India


DOI: 10.1615/IHMTC-2019.1660
pages 989-994


A computational model is developed for natural circulation (NC) based Canada deuterium uranium (CANDU) supercritical water reactor (SCWR). The computational model is designed to have non-dimensional parameters which are closely equal to those of a typical supercritical water natural circulation loop (SCWNCL). The NC based CANDU SCWR using supercritical water properties to identify the reactor steady-state operating conditions where maximum mass flow rate and heat transfer coefficient can be achieved. It is observed that, the steady-state mass flow rate significantly increases when the non-dimensional riser length increases and core length decreases. Apart from the stable steady state operation, unstable transient operating conditions are not desirable, which leads to density wave oscillations (DWOs) at supercritical condition. Nonlinear stability analysis with extensive numerical simulations is performed to obtain the marginal stability boundary in the operating regime of the reactor. Several parametric studies are performed to forecast the marginal stability boundary. The parametric studies include the effect of operating pressure, inlet temperature, core length and height of the chimney.