TY - GEN
T1 - Importance analysis in risk-informed decision-making of changes to Allowed Outage Times addressing uncertainties
AU - Martorell, S.
AU - Villamizar, M.
AU - Villanueva, J. F.
AU - Carlos, S.
AU - Sánchez, A. I.
PY - 2012
Y1 - 2012
N2 - Safe operation of Nuclear Power Plants (NPP) depends on the Technical Specifications (TS), so that TS are part of the Licensee Basis (LB) to operate a NPP, which were established taking into account mainly deterministic criteria. The development of PRA (Probabilistic Risk Assessment) and its application since the early 80's to analyze TS changes has brought the opportunity to review TS consistency from a risk viewpoint, i.e. addressing the impact of the changes on plant safety on the basis of the risk information provided by the PRA, with particular attention to the role of the Allowed Outage Times (AOT) included within the Limiting Conditions for Operation (LCO). In ESREL 2010, an overview of an approach for performing the PRA based analysis of AOT changes was presented including guidance for the treatment of uncertainties. It was discussed how the several types of epistemic uncertainties require to be characterized and managed within the PRA application, in particular, to evaluate the risk impact of an AOT change within LCO. The objective of this paper focuses on the use of importance analysis within the approach proposed. A case study that focuses on an AOT change of the Accumulators System of a Nuclear Power Plant using a level I PRA is provided.
AB - Safe operation of Nuclear Power Plants (NPP) depends on the Technical Specifications (TS), so that TS are part of the Licensee Basis (LB) to operate a NPP, which were established taking into account mainly deterministic criteria. The development of PRA (Probabilistic Risk Assessment) and its application since the early 80's to analyze TS changes has brought the opportunity to review TS consistency from a risk viewpoint, i.e. addressing the impact of the changes on plant safety on the basis of the risk information provided by the PRA, with particular attention to the role of the Allowed Outage Times (AOT) included within the Limiting Conditions for Operation (LCO). In ESREL 2010, an overview of an approach for performing the PRA based analysis of AOT changes was presented including guidance for the treatment of uncertainties. It was discussed how the several types of epistemic uncertainties require to be characterized and managed within the PRA application, in particular, to evaluate the risk impact of an AOT change within LCO. The objective of this paper focuses on the use of importance analysis within the approach proposed. A case study that focuses on an AOT change of the Accumulators System of a Nuclear Power Plant using a level I PRA is provided.
UR - http://www.scopus.com/inward/record.url?scp=84856704230&partnerID=8YFLogxK
M3 - Ponencia publicada en las memorias del evento con ISBN
AN - SCOPUS:84856704230
SN - 9780415683791
T3 - Advances in Safety, Reliability and Risk Management - Proceedings of the European Safety and Reliability Conference, ESREL 2011
SP - 2143
EP - 2151
BT - Advances in Safety, Reliability and Risk Management - Proceedings of the European Safety and Reliability Conference, ESREL 2011
T2 - European Safety and Reliability Conference: Advances in Safety, Reliability and Risk Management, ESREL 2011
Y2 - 18 September 2011 through 22 September 2011
ER -