Defect Detective: An Expert System for the Detection and Evaluation of Fuel Defects in CANDU-600 Nuclear Power Reactors

Abstract

DEFECT DETECTIVE is an expert system computerprogram that is used by AECL to detect and evaluatefuel defects on the basis of data received from thefour operating CANDU-600s. By applying the rules of data interpretation, the program evaluates the condition of the fuel defect in each suspect channel and recommends the removal priority. The recommendations are designed to minimize the costs associated with premature refuellings and the occupational exposures associated with the buildup of gamma radiation fields. These fields are due to depositing fission products that are released from some defects. Since both factors can have an impact on station economics, it is important to routinely analyze all available data that provides clues on the number, the condition, and the location of fuel defects.This expert system is intended to speed up routine analysis of fuel defect detection . It is written entirely in the PROLOG programming language which offers several advantages beyond expert system shells.