Nuclear Energy for New Europe 2009

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No: 305

Conference: Nuclear Energy for New Europe 2009

Title: Risk-Informed Decision-Making Related to the On-Line Maintenance

Theme: Probabilistic Safety Assessment

Author(s): Marko Čepin

Contact : Marko Čepin

E-mail: marko.cepin@ijs.si

Address: Institut "Jožef Stefan" R4
1001 Ljubljana

Country: Slovenia

Term On-Line Maintenance (OLM) represents testing and maintenance that is performed with the main generator of the nuclear power plant connected to the grid. The objective of the paper is to show risk evaluations of OLM activities of current plants and to examine if the current practices are suitable for the new nuclear power plants. The risk of testing and maintenance activities for selected equipment is evaluated for several nuclear power plant probabilistic safety assessments including a new power plant. The results of risk evaluations of OLM and their comparison show that the criteria or guidelines developed for existing plants are not completely suitable for new plants. The new power plants with expected lower risk measures, which can be lower for more than couple of orders of magnitude compared to existing plants, would be able to deal with OLM in plant configurations which would increase the risk for orders of magnitude, but would still be acceptable in terms of risk, if the existing criteria or guidelines are used. Results suggest that the risk criteria and guidelines for the OLM should be updated for their use in the case of new nuclear power plants.

No:	305
Conference:	Nuclear Energy for New Europe 2009
Title:	Risk-Informed Decision-Making Related to the On-Line Maintenance
Theme:	Probabilistic Safety Assessment
Author(s):	Marko Čepin
Contact :	Marko Čepin
E-mail:	marko.cepin@ijs.si
Address:	Institut "Jožef Stefan" R4 1001 Ljubljana
Country:	Slovenia

Term On-Line Maintenance (OLM) represents testing and maintenance that is performed with the main generator of the nuclear power plant connected to the grid. The objective of the paper is to show risk evaluations of OLM activities of current plants and to examine if the current practices are suitable for the new nuclear power plants. The risk of testing and maintenance activities for selected equipment is evaluated for several nuclear power plant probabilistic safety assessments including a new power plant. The results of risk evaluations of OLM and their comparison show that the criteria or guidelines developed for existing plants are not completely suitable for new plants. The new power plants with expected lower risk measures, which can be lower for more than couple of orders of magnitude compared to existing plants, would be able to deal with OLM in plant configurations which would increase the risk for orders of magnitude, but would still be acceptable in terms of risk, if the existing criteria or guidelines are used. Results suggest that the risk criteria and guidelines for the OLM should be updated for their use in the case of new nuclear power plants.