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[en] Results of two large load rejection cases: 100-15 % and 100-50 % for point kinetics (RELAP5 standalone code) and 3D coupled code RELAP5-QUABOX/CUBBOX are analyzed. A coupled code comprises the multidimensional neutron kinetics code model of QUABOX/CUBBOX and thermal hydraulic system code RELAP5. This coupled code version enables best-estimate analyses of dynamic behavior of nuclear power plant (NPP) due to two facts. First, a realistic simulation of the reactor core in three dimensions (3D) is performed. Secondly, a sophisticated thermal hydraulic code RELAP5 provides a respective thermal hydraulic analysis for all components in the plant on one side and on the other side its control variables and trips enable the realistic description of plant protection and control systems. A RELAP5/mod3 input data set for NPP Kriko at uprated conditions (1.06 PN) after steam generator (SG) replacement was extended with realistic feedwater system and all major control systems. (author)
Source
Croatian Nuclear Society, Zagreb (Croatia); 780 p; ISBN 953-96132-6-4; 
; 2000; p. 281-288; International conference: Nuclear Option in Countries with Small and Medium Electricity Grids; Dubrovnik (Croatia); 19-22 Jun 2000; 8 refs., 8 figs.
; 2000; p. 281-288; International conference: Nuclear Option in Countries with Small and Medium Electricity Grids; Dubrovnik (Croatia); 19-22 Jun 2000; 8 refs., 8 figs.