Abstract
The Limiting Conditions for Operation (LCO) and Allowed Outage Times (AOTs) given in Technical Specifications (TechSpec) were originally set for Electric Power Supply Systems (EPSS) using deterministic criteria and qualitative analysis, following similar principles as for the frontline safety systems. Because of diverse functional consequences, the safety impact of EPSS failures has been difficult to assess in a balanced way prior to being able to use a plant specific PSA. This background led to the incentive to improve the consistency of the current requirements. An integrated approach to evaluate risk impact of single and multiple failures was developed. Our paper will describe the main features of the developed approach, including the applied working criteria for the risk-based setup of AOTs and action statements, which considers several risk measures in parallel.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Himanen, R., Use of PSA as a tool to monitor and enhance safety of TVO NPP, TOPSAFE’ 95 Conference, Budapest, September 24–27, 1995.
Kosonen, M. & Mankamo, T., Risk-based approach to define Limiting Conditions of Operation and Allowed Outage Times for electrical power supply systems. IAEA Technical Committee Meeting on Procedures for Use of PSA for Optimizing NPP Operational Limits and Conditions, Barcelona, 20–23 September 1993. Proceedings.
T-Book. Reliability data book of components in Nordic NPPs, 3rd edition. Prepared by ATV Office, Vattenfall AB and Studsvik AB, 1992.
Risk-based optimization of technical specifications for operation of nuclear power plants. IAEA-TECDOC-729, December 1993.
Handbook of Methods for Risk-Based Analyses of Technical Specifications. Prepared by Samanta, P.K. & Kim, I.S. (BNL), Mankamo, T. (Avaplan Oy) and Vesely, W.E. (SAIC) for USNRC, Report NUREG/CR-5995, November 1994.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Springer-Verlag London
About this paper
Cite this paper
Pesonen, J., Kosonen, M., Mankamo, T. (1996). Risk Based Approach to Define Allowed Outage Times of Electric Power Supply Systems at the TVO I/II Plant. In: Cacciabue, P.C., Papazoglou, I.A. (eds) Probabilistic Safety Assessment and Management ’96. Springer, London. https://doi.org/10.1007/978-1-4471-3409-1_32
Download citation
DOI: https://doi.org/10.1007/978-1-4471-3409-1_32
Publisher Name: Springer, London
Print ISBN: 978-1-4471-3411-4
Online ISBN: 978-1-4471-3409-1
eBook Packages: Springer Book Archive