Change search
ReferencesLink to record
Permanent link

Direct link
An Opportunistic Maintenance Optimization Model for Shaft Seals in Feed-Water Pump Systems in Nuclear Power Plants
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
Show others and affiliations
2009 (English)In: 2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future / [ed] Toma L; Otomega B, New York: IEEE , 2009, 2962-2969 p.Conference paper (Refereed)
Abstract [en]

Nuclear power is one of the main electricity production sources in Sweden today. Maintenance management is one tool for reducing the costs for operation of a power plant. Driving forces for cost-efficiency has pushed the development of new methods for maintenance planning and optimization forward. Reliability Centered Asset Management (RCAM) is one of these new approaches, and maintenance optimization is one way to perform quantitative analysis which is a feature of RCAM. This paper proposes a model for opportunistic maintenance optimization where replacement schedules for shaft seals in feed-water pump systems in nuclear power plants are constructed. The feed-water pump system is important for the availability of the entire nuclear power plant. Results show that the optimization model is dependent on e.g. the discount interest and a limit for when the optimal solution goes from non-opportunistic to opportunistic is calculated. The circumstances for which opportunistic maintenance could be used have been investigated given different values of discount rates and remaining life at start of the planning period.

Place, publisher, year, edition, pages
New York: IEEE , 2009. 2962-2969 p.
Keyword [en]
Maintenance management, nuclear power, opportunistic maintenance, optimization, reliability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-25421DOI: 10.1109/PTC.2009.5281892ISI: 000276834601169ScopusID: 2-s2.0-74949087423ISBN: 978-1-4244-2234-0OAI: diva2:358174
2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future; Bucharest; Romania; 28 June 2009 through 2 July 2009

QC 20101021

Available from: 2010-10-21 Created: 2010-10-21 Last updated: 2014-10-06Bibliographically approved
In thesis
1. On maintenance management of wind and nuclear power plants
Open this publication in new window or tab >>On maintenance management of wind and nuclear power plants
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Electrical production in Sweden today is mainly from nuclear and hydro power. However, there is large increase in renewable energy like wind power and the installed new capacity goals are large. Several electrical production sources are important for the sustainability of the energy system. Maintenance is an approach for keeping a system sustainable. The importance of structured maintenance for reliable electrical production systems triggers the development of qualitative and quantitative maintenance management methods. Examples of these methods are Reliability-Centered Maintenance (RCM) which is a structured qualitative approach that focuses on reliability when planning maintenance, and Reliability Centered Asset Management (RCAM) which is a development of RCM into a quantitative approach with the aim to relate preventive maintenance to total maintenance cost and system reliability.

This thesis presents models, as applications of RCAM, based on the methods of Life Cycle Cost (LCC) and mathematical optimization, applied to wind and nuclear power plants. Both deterministic and stochastic approaches have been used and the proposed models are based on the Total Cost model, which summarizes costs for maintenance and production loss, and the Aircraft model, which is an opportunistic maintenance optimization model. Opportunistic maintenance is preventive maintenance performed at opportunities. The wind power applications in this study show on different ways to cover costs of condition monitoring systems (CMS) and further on economic benefits of these when uncertainties of times to failure are included in the model. The nuclear power applications show on that the optimization model is dependent on the discount rate and that a high discount rate gives more motivation for opportunistic replacements. When put into a stochastic framework and compared to other maintenance strategies it is shown that an extended opportunistic maintenance optimization model has a good overall performance, and that it, for high values of the constant cost of performing maintenance, is preferable to perform opportunistic maintenance. The proposed models, applied to wind and nuclear power plants, could be extended and adapted to fit other components and systems.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. vii, 38 p.
Trita-EE, ISSN 1653-5146 ; 2009:042
electrical poduction systems, windpower, nuclear power, maintenance management, RCM, RCAM, LCC, mathematical optimization, opportunistic maintenance
urn:nbn:se:kth:diva-11321 (URN)978-91-7415-448-1 (ISBN)
K2, Teknikrigen 28, KTH (Swedish)
Reliability and cost centered maintenance methods
Available from: 2009-10-26 Created: 2009-10-23 Last updated: 2010-10-21Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Nilsson, Julia
By organisation
Electromagnetic Engineering
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 66 hits
ReferencesLink to record
Permanent link

Direct link