An integrated on-line diagnostic system for the NORS process of halden reactor project: the design concept and lessons learned

During an extensive review made as part of the Integrated Diagnosis System project of the Halden Reactor Project, MOAS (Maryland Operator Advisory System) was identified as one of the most thorough systems developed thus far. MOAS is an integrated on-line diagnosis system that encompasses diverse functional aspects that are required for an effective process disturbance management: (1) intelligent process monitoring and alarming, (2) on-line sensor data validation and sensor failure diagnosis, (3) on-line hardware (besides sensors) failure diagnosis, and (4)real-time corrective measure synthesis. The MOAS methodology was used at the Halden Man-Machine Laboratory HAMMLAB of the OECD Halden Reactor Project. The performance of MOAS, developed in G2 real-time expert system shell for the high-pressure preheater of the NORS process in the HAMMLAB, was tested against a variety of transient scenarios, including failures of the control valves and sensors, and tube leakage of the preheater. These tests showed that MOAS successfully carried out its intended functions, i.e., quickly recognizing an occurring disturbance, correctly diagnosing its cause, and presenting advice on its control to the operator. The lessons learned and insights gained during the implementation and performance tests also are discussed. (author)