IRSN STRATEGY TO ASSESS A NEW MAINTENANCE POLICY

1. 27.09.2010 / Nesebar, Bulgaria Presented by Naoëlle MATAHRI, IRSN IRSN STRATEGY TO ASSESS A NEW MAINTENANCE POLICY

2. CONTEXT • A competitive environment • Optimization of the maintenance strategy • Increase of the availability • High level of safety

3. The selected method: AP-913 METHOD • Method developed by INPO • Objectives: • Improvement of the reliability of the systems and components • Improvement of the availability • Principle: analysis of the components behaviour and the operating condition • Structure: 6 equipment reliability (ER) process areas

4. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management AP-913 representation

5. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Scoping and identifcation of critical components » • Common scoping criteria • Identify important functions • Identify critical components • Identify non-critical components • Identify run-to-failure components • Based on the impact on the safety, the availability, the radiological protection, the personnel security and the environment

6. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Continuing equipment reliability improvement » • Development and use of preventive maintenance (PM) templates • Continuing adjustments to PM task and frequency based on station and industry equipment operating experience • Documentation of the PM technical bases • Consideration of alternative maintenance strategies to ensure reliable equipment • Continuous improvement from plant staff recommendations

7. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Performance monitoring » • System performance • Component performance • Predictive trending results • Operations rounds monitoring • Monitor testing and inspection results

8. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Preventive maintenance implementation » • Preventive maintenance work • Document equipment « as found », equipment condition • Equipment condition feedback • Standard post maintenance test

9. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Corrective action » • Corrective maintenance • Cause and corrective action • Prioritization of equipment problems

10. Performance monitoring Preventive maintenance implementation Scoping and identification of critical components Corrective action Continuing equipment reliability improvement Life cycle management ER process area « Life cycle management » • Long term strategy for system and component health • Prioritization of improvement activities • Integration of long term plans with the station business strategy

11. IRSN Strategy • Analysis of the international experience feedback of the implementation and use of the method. • Experiences of some American and foreign nuclear power plants and the American documents from INPO, EPRI, NEI and others. • A large EPRI documentation about the implementation but also the operating experience feedback : recommendations, advices and good practices detected and highlighted. • A complete understanding of the method and the key points of the implementation by foreign licensees.

12. IRSN Strategy • Classification : • Definition of common criteria for the nuclear power plant, • Choice of these criteria, • Methodology to classify. • Performance criteria: • Definition of these criteria, • Justification of the selected performance criteria.

13. IRSN Strategy • PM Template: • A matrix which represents, in a synthetic way, the monitoring and maintenance actions of similar equipment, and the associated periodicities. • Objective: to guarantee zero failure for the critical components. • Examples of tasks in these templates : • Diagnostic task, • Functional test, • Major periodic maintenance, • Maintenance based on the results of the diagnostic task (the preventive maintenance will be carried out only if the diagnosis shows weak points), • Periodic routine maintenance, • Periodic test… • Analysis of the content of the templates in order to guarantee the availability of the SSC important for safety.

14. IRSN Strategy • Organisational change: new divisions, new competences… • Competences: • To understand the physical, mechanical… phenomena, • To know the behaviour and the environment condition of the SSC, • To evaluate the performance of the SSC and its possible degradation, • To perform predictive trending analysis. • Necessary specific trainings for the plant staff • An accompaniment on site

15. IRSN Strategy • Measurement of the effectiveness of this maintenance from the safety point of view: • Maintenance performance indicators (MPI), • To monitor the maintenance performance in an effective and objective way, • The leading indicators for the effectiveness of the maintenance process and the lagging indicators measure results. • This mix provides a general sense of the overall performance of a maintenance programme. • IRSN performed the operational state-of-art in many countries and international organizations (IAEA, UE…). This analysis of the existing practices is performed in nuclear and non-nuclear industries.

16. Conclusion • The AP-913 method: a very structured asset management method • the main purpose : the zero failure for the structures, systems and components (SSC) classified in the critical category. • all the stages of components life: manufacture, supply, installation, monitoring of the performance during its use, life cycle management of the component. • The international experience feedback of the use of the method taken into account in the IRSN first assessment.