OECD/NEA PKL-4 benchmark activity. Code assessment of the relevant phenomena associated to a blind IBLOCA experiment

Code assessment and validation is one of the most relevant research lines in thermal hydraulics best estimate codes. During last decades, Nuclear Energy Agency (NEA) Organization for Economic Co-operation Development (OECD) have sponsored dozens experimental projects this field. Most them were compiled CSNI Validation Matrix 1996. Several been promoted new century as SETH, PKL, PKL-2, PKL-3 PKL-4 at PKL test facility. In 2017 a benchmark activity was launched within framework OECD/NEA project with aim assessing capabilities system codes to reproduce phenomena associated IBLOCA scenario. 16 participant organizations from 9 different countries simulated i2.2 (run 3) experiment semi-blind conditions. A large variety used activity: ATHLET, CATHARE, KORSAR, LOCUST, RELAP5, RELAPSCDASIM, SPACE TRACE. This paper presents main outcomes code such The first part describes features selection key validation. addition, intoduces detailed description each comparison between data blind simulations participants. Finally, sources uncertainty modelling are listed well conclusions activity. general, results obtained by all participants showed good performance satisfactory agreement data, which increases confidence current TH technologies. overall quality contributions partly consequence excellent documentation information provided team.