engleski

ASSESSMENT OF THE MSLB ACCIDENT SAFETY MARGINS FOR NPP KRŠKO

This paper presents the comparison between the 3-D neutronics (coupled code RELAP5/QUABOX/CUBBOX) and point kinetics (RELAP5/mod3.2.2) calculations of MSLB accident for NPP Krško (NEK) after steam generator (SG) replacement and at uprated conditions (6% power increase). The main steam line break (MSLB) accident in pressurized water reactors (PWR) is overcooling accident characterized by large variations in primary coolant conditions, asymmetric core inlet and outlet conditions and strongly localized reactivity disturbance due to assumed stuck control rod. The characteristics and phenomena related to the MSLB accident for best-estimate calculations can be accurately analyzed through the use of coupled code.

MSLB; NPP Krško; safety margins

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