A Study on ATOPS Seung Jun Lee Dept

A Study on ATOPS Seung Jun Lee Dept. of Nuclear and Quantum Engineering KAIST August 12, 2002 Korea Advanced Institute Science and Technology

Contents Introduction 2. ATOPS 1. 2. 3. 4. 5. 6. 3. What is ATOPS? Human operator vs. ATOPS Benefits Prototype of ATOPS Role of ATOPS Architecture Further Study Korea Advanced Institute Science and Technology 2

Introduction (1/2) In large and complex machine systems, many operations have become more difficult for users, resulting in a greater potential for operation errors. n Especially, in complex and safety-critical machine systems such as NPPs, unexpected errors caused by human operators could be causes of serious accidents and heavy loss. n There have been many researches on the human cognition and HMI. n Various computerized procedure systems have been developed during the past decade. n Korea Advanced Institute Science and Technology 3

Introduction (2/2) The remote monitoring and control system is a network-based system, network accidents can isolate human operators in remote place from NPP. n If some accidents isolate human operators in local as well as in remote area from NPP, there will be no one who can manage the plant and it can cause serious accidents. Therefore, we need to develop ATOPS to cope with these emergency situations. n In normal and abnormal situations, operators are usually to handle lots of information. ATOPS, which is to monitor the plant status, to detect and diagnose the status, and to perform control actions, can act as an operation support system and it can reduce the human operator’s workload. n Korea Advanced Institute Science and Technology 4

ATOPS n n FCPN, which is a colored Petri nets added with fuzzy concept, is a kind of Petri nets and it has more expressive power than other Petri Nets. For flexible decision making capability, ATOPS has knowledge database. n n monitor the plant status detect anomalies diagnose the status perform control actions on the plant according to corresponding operating procedures ATOPS operates a NPP according to prescribed procedures using FCPN. n n What is ATOPS? ATOPS performs actions as main control room (MCR) operators do. n n (Automated Operating Procedure System) The knowledge database of ATOPS is for intelligent functions of ATOPS. The knowledge database has much information on various situations such as experiences of human operators. ATOPS can not only be used as the automation system against emergency situations, but also as the operator support system for normal and abnormal states. Korea Advanced Institute Science and Technology 5

Human Operator vs. ATOPS Human Operator ATOPS Advantage n. Reasoning n. Fast Disadvanta ge n. Human error n. Cannot Remark n. Human factor n. System calculation speed n. No error handle unexpected situations V/V Korea Advanced Institute Science and Technology 6

Benefits n n n ATOPS will enhance safety of NPP by maintaining it in a stable and safe state in emergency situations even when the operators are not available. Various operation processes of NPP can be executed by ATOPS and it can prevent human errors and reduce workload of operators in normal and abnormal states. Developing ATOPS can also help evaluate operating procedures, since detailed analysis of operating procedures is required for the development of ATOPS can also test the operating procedures in connection to real plants or simulators. ATOPS can not only be used for future NPPs but also for existing NPPs because architectures and principles of ATOPS are independent from specific reactor types. Automation is a big trend of control technology in industrial field, so ATOPS will support evolution of automation technology. Korea Advanced Institute Science and Technology 7

Prototype of ATOPS n With the prototype of ATOPS, simulations of some emergency situations such as loss of coolant accident (LOCA) and steam generator tube rupture (SGTR) have been carried out in connection to FISA 2/WS simulator which is a simulator for the KORI 2 NPP unit. n (1/2) From these simulations, it was shown that ATOPS can manage the emergency states properly according to EOP. Korea Advanced Institute Science and Technology 8

Prototype of ATOPS (2/2) Single Alarm ARP Multiple Alarm Normal State AOP HSB State Trip or SI EOP Korea Advanced Institute Science and Technology 9

Role of ATOPS (1/3) Monitoring/ Detection Situation Assessment Response Planning Response Implementation Display System Fault Diagnosis System Decision Support System Implementation System Instrumentation System Control/Protection System Plant Integrated model for I&C systems, MMI and human operator Korea Advanced Institute Science and Technology 10

Role of ATOPS Monitoring/ Detection Situation Assessment Response Planning (2/3) Response Implementation ATOPS Display System Fault Diagnosis System Instrumentation System Decision Support System Implementation System Control/Protection System Plant Korea Advanced Institute Science and Technology 11

Role of ATOPS Monitoring/ Detection Situation Assessment (3/3) Response Planning Response Implementation ATOPS Display System Decision Support System Fault Diagnosis System Implementation System Autonomous Operating System Instrumentation System Control/Protection System Plant Korea Advanced Institute Science and Technology 12

Architecture Instrumentation System Fault Diagnosis System Decision Support System Procedure Database Inference Engine Knowledge Database Autonomous Operating System Korea Advanced Institute Science and Technology 13

Further Study Review of automation systems in other industrial fields such as autopilot systems in aeronautics area. n Review of automatic diagnosis systems. n Review of systems using knowledge database. n Korea Advanced Institute Science and Technology 14