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Projects / Programmes source: ARIS

Safety margins, thermalhydraulic, peak cladding temperature, two-phase flow, accuracy quantification

Research activity

Code Science Field Subfield
2.03.00  Engineering sciences and technologies  Energy engineering   

Code Science Field
T160  Technological sciences  Nuclear engineering and technology 
Keywords
safety margins, thermalhydraulic, peak cladding temperature, two-phase flow, accuracy quantification
Evaluation (rules)
source: COBISS
Researchers (7)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  04143  MSc Ljubo Fabjan  Energy engineering  Technical associate  2004 - 2007  177 
2.  24075  Tanja Klopčič    Technical associate  2004 - 2007 
3.  02852  PhD Borut Mavko  Energy engineering  Researcher  2004 - 2007  930 
4.  06631  PhD Iztok Parzer  Energy engineering  Researcher  2004 - 2006  194 
5.  21181  Zoran Petrič  Energy engineering  Researcher  2005 - 2007  15 
6.  08661  PhD Andrej Prošek  Energy engineering  Head  2004 - 2007  599 
7.  19725  Andrej Sušnik    Technical associate  2004 - 2007 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,664 
Abstract
A sufficient safety margin is a key issue for the economical operation of reactors using new fuel designs, high burn-up or new fuel management schemes. Especially important is the evaluation of the safety margin in relation to the Peak Cladding Temperature (PCT) during a hypothetical loss-of-coolant accident. Its accurate prediction is mostly connected to the cooling of the cladding. With the existing thermalhydraulic conservative codes it is not possible to assess the real safety margins for peak cladding temperature. The safety margins assessment with best estimate codes is influenced by uncertainties. The solution of this problem is development of thermalhydraulic codes based on physical models. The aims of the research are identification and development of methods for safety margin assessment, evaluation of system code results and of models controlling prediction of peak cladding temperatures, quantification of accuracy in the prediction and validation of newly proposed European NURESIM system code. The accuracy of models will be quantified using Fast Fourier Transform Based Method (FFTBM), which will be further improved in order to assess accuracy as a function of time. The models of existing RELAP5 and TRACE code will be evaluated on the base of experimental data. We will contribute to the development and validation of European NURESIM thermalhydraulic code. For validation the experiments dealing with core uncovery will be used (e.g. BETHSY data). The proposed aims are very challenging and are integrated in the EU 6 framework programme research. The proposed research contributes to assessment of safety margins, accuracy quantification of predictions, new simulation tools for thermal-hydraulics etc. The results of the proposed research are theoretical basis for safety analyses, related to safe operation of Krško nuclear power plant (NPP) and technical projects for Krško NPP and Slovenian Nuclear Safety Administration (SNSA). The research directly contributes to more flexible supply of electricity, environment protection and public health.
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