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FEASIBILITY STUDY OF A SYSTEM FOR THE BWR CONTROL ROD PATTERN DESIGN BASED ON FUZZY LOGIC AND HEURISTICS

This paper presents the development of a fuzzy logic control and heuristic based system for the control rod pattern (CRP) design of Boiling Water Reactors (BWR). At this stage of the study, very simple membership functions and fuzzy rules are defined to control the neutron multiplication factor (K) and the maximum relative nodal power (MRNP) by acting over the control rods relative movement. The Mamdani implication process is used to evaluate the membership functions. The variable K is controlled in order to bring the reactor to the critical state, and the MRNP is controlled to maintain the main thermal limits in the core under their design values. Several heuristic rules are implemented to govern the control rods’ movement in the core. The system was tested with the cycle 5 of Laguna Verde Nuclear Power Plant using the CM-PRESTO simulator. The results obtained show that a very reasonable control rod programming can be achieved with a quite simple methodology. The obtained cycle length is comparable with that achieved with a Haling based simulation and the predicted by the cycle 5 design document.