Category Archives: Natural circulation data and methods for advanced water cooled nuclear power plant designs

Design basis accidents (DBAs)

Transients without a loss-of-coolant are part of the DBAs. With the exception of containments with a pressure suppression system no major interaction with the containment atmosphere exist. Steam injected into the water pool of the suppression system is condensed in the pool and creates thus some circulation in the pool. There is experimental and operational evidence that the mixing in […]

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Activities of passive cooling applications and simulation of innovative nuclear power plant design

F. Aglar, A. Tanrikut Turkish Atomic Energy Authority, Turkey Abstract. This paper gives a general insight on activities of the Turkish Atomic Energy Authority (TAEA) concerning passive cooling applications and simulation of innovative nuclear power plant design. The condensation mode of heat transfer plays an important role for the passive heat removal application in advanced water-cooled reactor systems. But it […]

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INTRODUCTION

The complex set of physical phenomena that occur in a gravity environment when a geometrically distinct heat sink and heat source are connected by a fluid flow path can be identified as natural circulation (NC). No external sources of mechanical energy for the fluid motion are involved when NC is established. In a number of publications, including textbooks, the term […]

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EXPERIMENTAL INVESTIGATION OF NATURAL CIRCULATION SYSTEMS

4.1. INTRODUCTION Although a large amount of thermal hydraulic data exist from the beginning of nuclear reactor development there is still some need for additional experimental data. This is on one hand due to the focus on an area not well studied in the past — in this case natural circulation in nuclear reactor application — and on the other […]

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FLOODING OF THE RPV FROM OUTSIDE IN A CORE MELT ACCIDENT

When the water inventory of the RPV decreases from about 400 Mg to 160 Mg, the drywell around the RPV is flooded from the core flooding pool when two valves in the flooding line are opened either actively or passively (see Fig. 7). The main aim of flooding the RPV from outside is to achieve long-term retention of even a […]

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. Wind channel test for passive containment cooling system

The wind channel test will research air flow resistance characteristic and effects of air channel shape and air inlet location on natural circulation flow. The influence of environment wind and surrounding buildings on the natural convection flow had been especially considered. Moreover, the velocity field at the lower turning of air baffle

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The calculations were performed with APROS version 4.06

The first pressure peak occurred too early in the APROS calculation and one additional pressure peak was observed after the pressure had already started to drop in the experiment. The code simulated the general trend of the downcomer flow behaviour well until the PSIS stagnated. During the PSIS stagnation period, between 10000 and 12000 seconds, the downcomer flow decreased and […]

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