Original scientific paper

NPP Krško Post-UFC Transient Response during MSLB

Štefica Vlahović ; Faculty of Electrical Engineering and Computing Unska 3, 10000 Zagreb, Croatia
Davor Grgić ; Faculty of Electrical Engineering and Computing Unska 3, 10000 Zagreb, Croatia
Vesna Benčik ; Faculty of Electrical Engineering and Computing Unska 3, 10000 Zagreb, Croatia

Abstract

UpFlow Conversion (UFC) was implemented in NPP Krško during the last outage in order to
reduce the pressure differential across baffle plates and the possibility of the fuel damage caused by
flow induced vibration. The paper describes the coupled code calculation (RELAP5 and PARCS) of
MSLB accident at power for pre and post-UFC configuration of reactor vessel. In the calculation,
the split model of the reactor vessel was used to better describe asymmetric conditions in loops. It
has been demonstrated that the basic parameters (pressure, temperatures) stayed unchanged and
there was little change in the flow rates except in baffle-barrel region of the vessel where both flow
direction and amount of flow were changed.

Keywords

upflow conversion; MSLB; coupled code; reactor vessel model

Hrčak ID:

199629

URI

https://hrcak.srce.hr/199629

Publication date:

15.10.2017.

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