TY - GEN
T1 - Risk-informed decision-making on 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 - 2010
Y1 - 2010
N2 - Technical specification (TS) establishes the limits and conditions for the safety operation of Nuclear Power Plants. These limits and conditions have been originally based on engineering judgments and determinist analysis. Regulatory bodies are encouraging the use of Probabilistic Risk Assessment (PRA) to support a risk-informed regulatory framework, in particular for evaluating changes to TS seeking for an improvement in NPP safety. However, in spite of regulatory guides require that all sources of uncertainty be indentified and analyzed such that their impacts are understood, it is only recently when some guidance is being proposed on the systematic treatment of uncertainties associated with the use of the PRA in risk-informed decision making of LB changes. However, no specific guidance has been proposed yet for the treatment of uncertainties in analyzing TS changes. This paper presents an approach for the evaluation of the risk impact of changes to an Allowed Outage Time (AOT), which is part of the Limiting Condition for Operation (LCO) in TS, using a level I PRA including treatment of uncertainties. It is provided also a case study that focuses on an AOT change of the Accumulators System of a Nuclear Power Plant.
AB - Technical specification (TS) establishes the limits and conditions for the safety operation of Nuclear Power Plants. These limits and conditions have been originally based on engineering judgments and determinist analysis. Regulatory bodies are encouraging the use of Probabilistic Risk Assessment (PRA) to support a risk-informed regulatory framework, in particular for evaluating changes to TS seeking for an improvement in NPP safety. However, in spite of regulatory guides require that all sources of uncertainty be indentified and analyzed such that their impacts are understood, it is only recently when some guidance is being proposed on the systematic treatment of uncertainties associated with the use of the PRA in risk-informed decision making of LB changes. However, no specific guidance has been proposed yet for the treatment of uncertainties in analyzing TS changes. This paper presents an approach for the evaluation of the risk impact of changes to an Allowed Outage Time (AOT), which is part of the Limiting Condition for Operation (LCO) in TS, using a level I PRA including treatment of uncertainties. It is provided also a case study that focuses on an AOT change of the Accumulators System of a Nuclear Power Plant.
UR - http://www.scopus.com/inward/record.url?scp=84861677016&partnerID=8YFLogxK
M3 - Ponencia publicada en las memorias del evento con ISBN
AN - SCOPUS:84861677016
SN - 9780415604277
T3 - Reliability, Risk and Safety: Back to the Future
SP - 2278
EP - 2286
BT - Reliability, Risk and Safety
T2 - European Safety and Reliability Annual Conference: Reliability, Risk and Safety: Back to the Future, ESREL 2010
Y2 - 5 September 2010 through 9 September 2010
ER -