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¡ÖTransient Heat Source Treatment for CANDU Moderator Analysis by Using Junction Box Routines¡×
Korea Atomic Energy Research Institute
Churl Yoon¡¡ÍÍ
¥­¡¼¥ï¡¼¥É CANDU¡¢Moderator¡¢CFD¡¢Loss of Coolant Accident(LOCA)¡¢Junction Box
³µÍ× A CFD moderator analysis model based on ANSYS CFX-10 has been developed for the CANDU moderator analysis. The transient heat source that is also a function of spatial coordinates was implemented by using Junction Box routines. For Wolsong Units 2/3/4, a steady-state moderator circulation under operating conditions and local moderator subcooling during a LOCA transient were calculated. Compared to former studies, the current analysis gives well matched and reasonable results. This new CFD model based on a coupled solver shows dramatic increase of computing speed, compared to that based on a segregated solver (CFX-4).
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¡ÖStudy on flow behavior and separation efficiency in watersteam separator¡×
Doosan Heavy Industries & Construction
Chae-Soo Lee¡¡ÍÍ
¥­¡¼¥ï¡¼¥É Water-Steam Separator¡¢Cyclone Separator¡¢Once through HRSG
³µÍ× Recently, innovation trends on extensive cycling operation and gas turbine capacities have shown improved technologies on their higher exhaust gas temperatures and flow rates. Thus, once-through boiler technologies had fostered application to heat recovery steam generators (HRSG) for combined cycle power plants. One of the biggest constructional differences between drum type HRSG and once-through HRSG is that water-steam separator substitutes the drum. The principal function of separator is to separate the water from water-steam mixture during start-up and shut down, whereas to keep the pressure loss as low as possible. In order to improve separation efficiency and decrease pressure loss simultaneously, study on flow behavior in the existing separator should be preceded. PIV(Particle Image Velocimetry) measurement system has been used to measure the velocity profile using a constructed scaled-test model. Water-air test facility also evaluated further the separation efficiency. CFD studies were simulated using the commercially available ANSYS CFX 10.0. Results from CFD studies were compared with experimental test results. Two important parameters, depth and diameter of outlet nozzle had been chosen for the investigation of the separator¡Çs performance. Optimum depth and diameter of outlet nozzle were etermined by CFD analysis.
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