Abstract
This paper presents the pin-by-pin thermal-hydraulic model of the fuel assembly (FA) developed with the KORSAR/GP code. Its application for simulation of separate fuel rods in the FA is demonstrated.Usually the safety margins are calculated using a «hot channel» model for NPP (Nuclear Power Plant) safety analysis. This approach is conservative. The pin-by-pin simulation provides more realistic results and wider safety margins.The new KORSAR/GP pin-by-pin model was cross-validated with the TIGR-SP code which is used by OKB «GIDROPRESS» for FA steady-state operation assessment. DNBR (departure from nucleate boiling ratio) difference between KORSAR/GP and TIGR-SP does not exceed 3%. Thus, the KORSAR/GP pin-by-pin model provides correct results.The nodalization of the developed model consists of parallel 1D hydraulic elements (channels). The cells of these channels are connected to each other by special elements – cross-junctions and turbulent mixing elements (CJ and TM). The paper also deals with the investigation of influence of these elements on DNBR calculation.
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