IRSN STRATEGY TO ASSESS A NEW
MAINTENANCE POLICY
27.09.2010 / Nesebar, Bulgaria
Presented by Naoëlle MATAHRI, IRSN
CONTEXT
A competitive environment
Optimization of the maintenance strategy
Increase of the availability
High level of safety
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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
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AP-913 representation
Performance
monitoring
Scoping and
identification of
critical components
Continuing
equipment
reliability
improvement
Preventive
maintenance
implementation
Corrective action
Life cycle
management
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ER process area « Scoping and identifcation of critical
components »
Common scoping criteria
Identify important functions
Performance
monitoring
Preventive
maintenance
implementation
Identify critical components
Identify non-critical components
Identify run-to-failure components
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
Based on the impact on the safety,
the availability, the radiological
protection, the personnel security
and the environment
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Corrective
action
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
Performance
monitoring
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
Continuous improvement from plant
staff recommendations
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Preventive
maintenance
implementation
Corrective
action
Life cycle
management
ER process area « Performance monitoring »
Performance
monitoring
System performance
Preventive
maintenance
implementation
Component performance
Predictive trending results
Operations rounds monitoring
Monitor testing and inspection
results
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
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Corrective
action
Life cycle
management
ER process area « Preventive maintenance
implementation »
Performance
monitoring
Preventive
maintenance
implementation
Preventive maintenance work
Document equipment « as found »,
equipment condition
Equipment condition feedback
Standard post maintenance test
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
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Corrective
action
Life cycle
management
ER process area « Corrective action »
Performance
monitoring
Preventive
maintenance
implementation
Corrective maintenance
Cause and corrective action
Prioritization of equipment
problems
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
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Corrective
action
Life cycle
management
ER process area « Life cycle management »
Performance
monitoring
Preventive
maintenance
implementation
Long term strategy for system and
component health
Prioritization of improvement
activities
Integration of long term plans with
the station business strategy
Scoping and
identification of
critical
components
Continuing
equipment
reliability
improvement
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Corrective
action
Life cycle
management
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.
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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.
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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.
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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
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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.
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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.
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