Abstract
The condensation in horizontal tubes plays an important role in determining the operation mode of passive safety systems of modern nuclear power plants. In this paper, two different approaches for modelling of this phenomenon are compared and verified against experimental data. The first approach is based on the flow regime map developed by Tandon. Depending on the regime, the heat transfer coefficient is calculated according to corresponding semi-empirical correlation. The second approach uses a general, fully empirical correlation proposed by Shah. Both models are developed with utilization of the object-oriented, equation-based Modelica language and the open-source Open-Modelica environment. The results are compared with data obtained during a large scale integral test, simulating a Loss of Coolant Accident scenario performed at the dedicated Integral Test Facility Karlstein (INKA) which was built at the Components Testing Department of AREVA in Karlstein, Germany. The INKA facility was designed to test the performance of the passive safety systems of KERENA, the new AREVA boiling water reactor design. INKA represents the KERENA containment with a volume scaling of 1:24. Components heights and levels over the ground are in the full scale. The comparison of simulations results shows a good agreement.
Highlights
KERENA is a medium-capacity boiling water reactor developed by AREVA GmbH [1]
Experimental data for model validation was obtained during the simulation of the Main Steam Line Break (MSLB), taking into account heat decay
The test was performed at the Integral Test Facility Karlstein (INKA) test facility in the framework of the EASY Project
Summary
KERENA is a medium-capacity boiling water reactor developed by AREVA GmbH [1]. It utilizes several innovative passive safety systems that ensure safe depressurization and heat removal in case of an emergency or accidents, including a loss of coolant accident (LOCA). The main components of KERENA passive safety features are a Containment Cooling Condenser (CCC), Emergency Condenser (EC), Passive Pressure Pulse Transmitters (PPPT) and a Passive Core Flooding System. These systems utilize basic physical laws such as gravity and free convection. In order to operate them, there is no need for an external power supply and additional devices such as pumps. This in turn leads to a significant reduction of costs during construction of the plant
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