Abstract

The primary objective of this paper is to determine the channel flow stability map using RETRAN02/MOD5 code under natural circulation conditions for Kuosheng Nuclear Power Plant (KNPP). Meanwhile, two transient loci of KNPP recirculation pump trip (RPT) with decreasing feedwater enthalpy are also drawn on the stability map to assess whether similar power oscillation phenomena as LaSalle-2 event may occur at KNPP. To avoid numerical oscillation of flow stability in time domain analysis, several sensitivity studies are also carried out. The results indicate that both transient loci have enough stability margins to unstable boundary and reveal that KNPP's operations will be stable under such RPT with decreasing feedwater enthalpy transients.

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