Yasuhiro Masuhara

Evaluation Model of Turbine Meter for Two-Phase Flow

An evaluation model of a turbine meter has been developed to predict two-phase liquid velocity. The model considers the effects of blade configuration and void fraction distribution. In order to verify its applicability, experiments in single-phase and two-phase flows were performed and the model was compared with existing theories. This report describes the model and the experimental results on single-phase and two-phase flows.

An on-line method to monitor bwr core stability based on an autocorrelation method

Abstract An on-line monitoring method is introduced for BWR core stability. The method utilizes only autocorrelation values for two delay time intervals. Its simplicity makes it suitable for an on-line monitor. Accuracy of the core decay ratio calculated by the method improves as the core condition approaches instability. The error in the decay ratio for regional limit cycle oscillations is 0.2% when calculated from local signals in the most unstable region, and 4% when calculated from core averaged signals.