Operations, Applications & Components

Maintenance Optimization and Nuclear Power Plant Life Management—A Proposal for an Integrated Set of Maintenance Effectiveness Indicators

[+] Author and Article Information
Paolo Contri

 JRC—Institute for Energy, Petten, The Netherlands

Irina Kuzmina

Vienna, Austria

Bernhard Elsing

 European Commission, DG JRC - Institute for Energy and Transport, Nuclear Reactor Safety Assessment Unit, Westerduinweg 3, NL-1755 ZG Petten, The Netherlandsbernhard.elsing@ec.europa.eu

JRC Enlargement and Integration Workshop IE-W06 “Optimization of Maintenance Programs at NPPs With Consideration of Safety and Economical Aspects,” Nov. 13–14, 2008, JRC—Institute for Energy, Petten, The Netherlands.

Wrench time is a measure of crafts personnel at work, using tools, in front of jobs. Wrench time does not include obtaining parts, tools or instructions, or the travel associated with those tasks. It does not include traveling to or from jobs. It does not include time spent obtaining work assignments.

IAEA definition: A Risk Monitor is “a plant specific real-time analysis tool used to determine the instantaneous risk based on the actual status of the systems and components. At any given time, the safety monitor reflects the current plant configuration in terms of the known status of the various systems and/or components, e.g., whether there are any components out of service for maintenance or tests.

IAEA definition: A Living PSA is a PSA study of the plant, which is updated as necessary to reflect the current design and operational features and is documented in such a way that each aspect of the model can be directly related to existing plant information, plant documentation, or the analysts’ assumptions in the absence of such information.

J. Pressure Vessel Technol 134(3), 031602 (May 18, 2012) (6 pages) doi:10.1115/1.4005809 History: Received June 16, 2009; Revised July 17, 2011; Published May 17, 2012; Online May 18, 2012

Economic deregulation of electricity markets in many countries has placed nuclear power plants (NPPs) in a new competitive environment where capital, operating, and maintenance costs must be minimized. Optimization of the maintenance strategy, enhancement of the maintenance efficiency, and monitoring of the performance are becoming the key attributes to ensure the survival of nuclear utilities in the energy market. The Institute for Energy and Transport (IET), one of the seven scientific Institutes of the Joint Research Centre (JRC), aDirectorate General of the European Commission (EC) recognized the need to collect relevant experience and suggests a consolidated system of maintenance performance indicators (MPIs) to measure the maintenance effectiveness. This paper highlights the latest improvements of the suggested system and discusses open issues that need to be addressed in further research activities for enhancing the maintenance effectiveness of NPPs.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

An approach to the monitoring of maintenance performance

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Figure 2

Example of plant risk profile provided by risk monitor

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Figure 3

Representation indicator D, the deviation of SMIs from the thresholds

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Figure 4

Representation indicator A, the SMIs gap to the target



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