The application of steam generator code CCM based on theoretical drift-flux

A coolant channel module (CCM) is presented to simulate, in a very general way, the thermal-hydraulic behavior of single-and two-phase flow along a heated (or cooled) vertical, inclined or horizontal coolant channel. It is based on a drift-flux model with governing equations describing mass, momentum and energy balances for both the steady-state and transient flows in such a general channel. A special time-dependent quadratic polygon approximation method using a modified finite volume algorithm is employed to establish a connection between nodal boundaries and nodal-mean parameters. By using the code CCM, the U-tube steam generator simulation program UTSG-3 has been assembled, which simulates the transient behavior when steam generator operates under either normal or accident conditions. The transient responses of operation parameters of a steam generator similar to that of Daya Bay NPP are studied by means of different operation parameter perturbations. The results show that the UTSG-3 is capable of simulating the dynamic behavior of U-tube steam generator. (authors)