Risk management and maintenance optimization of nuclear reactor cooling piping systems

Title: Risk management and maintenance optimization of nuclear reactor cooling piping systems
Author(s): L. Augé, B. Capra, M. Lasne, P. Bénéfice, R. Comby
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 5
Language: English

Abstract: Seaside nuclear power plants have to face the ageing of nuclear reactor cooling piping systems. In order to minimize the duration of the production unit shutdown, maintenance operations have to be planned well in advance. In a context where owners of infrastructures tend to extend the life span of their goods while having to keep the safety level maximum, it is more and more important to develop high level expertise and know-how in management of infrastructures life cycle. Oxand’s methodology relies on several modules that all participate in fixing network optimum replacement dates: expertise on ageing mechanisms (corrosion, cement degradation…) and the associated kinetics, expertise on impacts of ageing on functional integrity of piping systems, predictive simulation based on experience feedback, development of monitoring techniques focused on actual threats. More precisely, a patented monitoring technique based on optic fibber sensors, which aims at controlling the deterioration level of piping systems, has been designed. This preventive maintenance enables the owner to determine criteria for network replacement based on degradation impacts. This approach helps the owner justify his maintenance strategy and allows him demonstrating he actually manages the safety level. More generally, all monitoring techniques used by the owners are valorised and coupled to predictive simulation tools, notably thanks to processes based on Bayesian approaches. A methodology to evaluate and optimize operation budgets, depending on predictions of future functional deterioration and available maintenance solutions, has been developed and applied. Finally, all information related to infrastructure ageing and available maintenance options are put together to establish the right solution for safe and performing infrastructure management.

Keywords: reinforced concrete pipes, corrosion, maintenance strategy, optimisation

Online publication: 2006-08-02
Classification: 3.3 Theme 3: Monitoring, Repair and Maintenance of Concrete Structures
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.088