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[en] In the paper the results of the RELAP5/MOD 3.3 analysis of the Reactor Coolant Pump (RCP) Trip event at NPP Krsko are presented. The event was initiated by an operator action aimed to prevent the RCP 2 bearing damage. The action consisted of a power reduction, that lasted for 50 minutes, followed by a reactor and a subsequent RCP 2 trip when the reactor power was reduced to 28 %. Two minutes after reactor trip, the Main Steam Isolation Valves (MSIV) were isolated and the steam dump flow was closed. On the secondary side the Steam Generator (SG) pressure rose until SG 1 Safety Valve (SV) 1 opened. The realistic RELAP5/MOD 3.3 analysis has been performed in order to model the particular plant behavior caused by operator actions. The comparison of the RELAP5/MOD 3.3 results with the measurement for the power reduction transient has shown small differences for the major parameters (nuclear power, average temperature, secondary pressure). The main trends and physical phenomena following the RCP Trip event were well reproduced in the analysis. The parameters that have the major influence on transient results have been identified. In the paper the influence of SG 1 relief and SV valves on transient results was investigated more closely. (author)
Source
Ravnik, M.; Zagar, T. (Nuclear Society of Slovenia (Slovenia)) (eds.); Nuclear Society of Slovenia, Ljubljana (Slovenia). Funding organisation: Inst. Jozef Stefan, Ljubljana (Slovenia); NUMIP, Krsko (Slovenia); Ministry of Education, Science and Sport of Slovenia, Ljubljana (Slovenia); Westinghouse Electric Systems Europe S.A., Brussels (Belgium); Framatome, Paris (France); Agency for Radwaste Management, Ljubljana (Slovenia); Inetec, Zagreb (Croatia); Elmont, Krsko (Slovenia); Slovenian Nuclear Safety Administration, Ljubljana (Slovenia); Inst. of Metals and Technology, Ljubljana (Slovenia); Inst. of Metal Constructions, Ljubljana (Slovenia); Q Techna, Krsko (Slovenia); Faculty of Mechanical Engineering, Univ. of Ljubljana (Slovenia); Graduate Program Nucelar Engineering, Univ. of Ljubljana (Slovenia); 827 p; ISBN 961-6207-21-0; 
; 2003; [9 p.]; International Conference Nuclear Energy for New Europe 2003; Portoroz (Slovenia); 8-11 Sep 2003; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 5 refs., 2 tabs., 7 figs.
; 2003; [9 p.]; International Conference Nuclear Energy for New Europe 2003; Portoroz (Slovenia); 8-11 Sep 2003; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 5 refs., 2 tabs., 7 figs.