A simple approach for pre-loca analysis of MTR type research reactors
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Date
2003
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
National Nuclear Center of the Republic of Kazakhstan / Institute of Nuclear Physics
Abstract
In this study, it is intended to analyze early phases of a protected loss of coolant accident (LOCA) for TR-2 Research Reactor at Istanbul, and to show the applicability of the presented model to the other similar types of research reactors. The transient situation since the time when coolant is beginning to be lost throughout one or more of the main coolant pipes which were supposed to be broken guillotine-like to the time when the core is totally uncovered is investigated. The modeling of the problem was separated into two phases; in the first
phase when the water level of the pool is being decreased in a pre-estimated timedependent way calculated by using Modified Bernoulli Equation, the conservation equations are solved by a usual implicit finite difference algorithm. The later phase, when water level reaches to the top level of fuel plates and begins to decrease until the bottom of the core, needs some modifications to the approach used for the first phase. Because, the coolant channels among fuel plates are filled with air when the level goes below, and the fuel plates are being cooled by air above the water level. This complexity is resolved using a moving boundary approach in the numerical solution. A Lagrange type interpolation approximation for the derivatives along with interface conditions in the neighborhood of the airwater interface was imported to the numerical algorithm. The analysis is performed for a nominal channel.
Description
TENMAK D.N.3326
Keywords
MTR type research reactors, MTR tipi araştırma reaktörleri
Citation
Yılmazer, A. ve Yavuz, H. (2003). A simple approach for pre-loca analysis of MTR type research reactors. The Second Eurasian Conference on Nuclear Science and Its Application : Presentations, 1.c., (s.33-40). 16-19 September 2002. Almaty : Kazakhstan.