Quantitative risk reduction by means of recovery strategies

París, C., C. Queral, J. Mula, Gómez-Magán, J., Sánchez-Perea, M., Meléndez, E. and J. Gil

Reliability Engineering and System Safety, 2019, vol. 182, issue C, 13-32

Abstract: After the accident at Fukushima Dai-ichi, considerable efforts were put on enhancing the capability of the Nuclear Power Plants to cope with conditions resulting from the loss of plant safety-related systems. The most widespread solution adopted worldwide has been to define and implement new procedures and emergency actuation plans, the so called FLEX strategies. Among these strategies, there are several recovery strategies which involve the use of portable equipment for accomplishing the safety functions of the unavailable systems. In some cases, these strategies have been devised to be performed concurrently to the usual system recovery procedures included in the EOPs of most NPPs. In this regard, the heat sink recovery after the occurrence of a Total Loss of Feedwater (TLFW) in a Westinghouse 3-loop PWR design is a significant example, and it has been chosen in the present study to assess the quantitative risk reduction provided by the usual and FLEX recovery strategies in a Westinghouse 3-loop PWR design. With this aim, the Integrated Safety Assessment (ISA) methodology, developed by the Spanish Nuclear Safety Council (CSN), has been applied to TLFW sequences as part of the collaboration between Technical University of Madrid (UPM), NFQ Solutions and CSN.

Keywords: Damage domain; Dynamic event tree; Integrated safety assessment; Recovery and FLEX strategies; Probabilistic safety analysis; Acronyms: AFW, Auxiliary feed water; BDBEE, Beyond design basis external event; CSF, Critical safety function; CSN, Spanish nuclear safety council; DD, Damage domain; DEF, Damage exceedance frequency; DEP, Damage exceedance probability; DET, Dynamic event tree; EOP, Emergency operating procedure; ET, Event tree; F&B, Feed and bleed; FSLOCA, Full spectrum loss of coolant accident; FT, Fault tree; GET, Generic event tree; GETU, Generic event tree with uncertainties; HPSI, High pressure safety injection; IE, Initiating event; ISA, Integrated safety assessment; LOCA, Loss of coolant accident; MFW, Main feed water (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0951832017311742
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:182:y:2019:i:c:p:13-32

DOI: 10.1016/j.ress.2018.09.024

Access Statistics for this article

Reliability Engineering and System Safety is currently edited by Carlos Guedes Soares

More articles in Reliability Engineering and System Safety from Elsevier
Bibliographic data for series maintained by Catherine Liu (repec@elsevier.com).