Ya. Hassan et Dr. Moscalu, Simulation of two loss-of-flow transients in a VVER-1000 nuclear power plant with RELAP5/MOD3.2 system code, NUCL TECH, 129(1), 2000, pp. 82-92
A RELAP5/MOD3.2 model of a VVER-1000 (V-320 model) nuclear power plant was
updated, improved, and validated against actual power plant data. The data
included steady-state and operational transient results from unit 5 of the
Kozloduy nuclear power plant in Bulgaria. The first operational transient w
as initiated by a loss of flow at partial power conditions caused by the tr
ip of a main coolant pump without reactor scram. The second operational tra
nsient was a continuation of the first, with the trip of a second main cool
ant pump.
The assessment of the model has been performed in two stages: an initial va
lidation against steady-state plant data and then a transient validation by
comparison to operational transient data. The comparison between the plant
data and the results of the calculations proved the adequacy of the model
and demonstrated the capability of the code to reproduce the evolution of t
he main plant parameters.