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

V. Martinez-Quiroga (1) , M. Szogradi (2) , S. Schollenberger (3) , M. Sanchez-Perea (4) , N. Sandberg (5) , J. Zhongyun (6) , P. Freydier (7) , M. Suslov (8) , H. Austregesilo (9) , Tony Glantz (10) , J.H. Lee (11) , Z. Li (12) , I. Shvetsov , R. Mukin (13) , J. Holmstrom (14) , J.F. Villanueva (15) , E. Virtanen (16) , J. Freixa (17)

1 UPC - Universitat Politècnica de Catalunya = Université polytechnique de Catalogne [Barcelona]
2 VTT - VTT Technical Research Centre of Finland
3 Framatome GmbH
4 CSN
5 OECD/NEA - OECD Nuclear Energy Agency
6 China Nuclear Power Technology Research Institute
7 EDF - EDF
8 OKB
9 Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbH
10 IRSN/PSN-RES/SEMIA/LEMC - Laboratoire d'étude et de modélisation du combustible
11 KAERI - Korea Atomic Energy Research Institute [Daejeon, south Korea]
12 Nuclear Power Institute of China
13 PSI - Paul Scherrer Institute
14 Ringhals AB/NUQ, 432 58 Väröbacka, Sweden
15 UPV - Universitat Politècnica de València = Universitad Politecnica de Valencia = Polytechnic University of Valencia
16 STUK - Säteilyturvakeskus [Suomi] = Radiation and Nuclear Safety Authority in Finland = Autorité de sûreté nucléaire et de radioprotection [Finlande]
17 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)

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

Domaines: Sciences de l'ingénieur [physics]

V. Martinez-Quiroga, M. Szogradi, S. Schollenberger, M. Sanchez-Perea, N. Sandberg, et al.. OECD/NEA PKL-4 benchmark activity. Code assessment of the relevant phenomena associated to a blind IBLOCA experiment. Nuclear Engineering and Design, 2022, 389, pp.111632. ⟨10.1016/j.nucengdes.2021.111632⟩. ⟨hal-03977035⟩