Representing Operational Knowledge of PWR Plant by Using Multilevel Flow Modelling

Abstract: The aim of this paper is to explore the capability of representing operational knowledge by using Multilevel Flow Modelling (MFM) methodology. The paper demonstrates how the operational knowledge can be inserted into the MFM models and be used to evaluate the plant state, identify the current situation and support operational decisions. This paper will provide a general MFM model of the primary side in a standard Westinghouse Pressurized Water Reactor (PWR) system including sub-systems of Reactor Coolant System, Rod Control System, Chemical and Volume Control System, emergency heat removal systems. And the sub-systems' functions will be decomposed into sub-models according to different operational situations. An operational model will be developed based on the operating procedure by using MFM symbols and this model can be used to implement coordination rules for organize the utilization of different MFM models in different situation. Combining the operational model and different process models, MFM can be used to identify plant situation