The OECD Nuclear Energy Agency-Paul Scherrer Institut (NEA-PSI) Benchmark was initiated to test the capability of state-of-the-art Computational Fluid Dynamics (CFD) and dedicated containment codes to predict the important physical processes occurring in a containment volume following a postulated severe accident in which there is a significant build-up of hydrogen in the containment atmosphere.
To provide a suitable experimental data base for the benchmark exercise, a new test was carried out during February-March 2013 within one, comprehensively-instrumented vessel of the PANDA integral containment facility, located at PSI in Switzerland. The facility had been used in the past within the context of several NEA-sponsored benchmarking initiatives, and as a result the members of the PANDA experimental team have acquired considerable experience in performing containment tests of the type required here. However, some extra care was needed in this case: namely, that precise information on measurement error, jet injection boundary conditions, was provided in a consistent package, which made up the benchmark specifications. Also, the invitation to participate was made to a wider audience, since this test was 100% PSI funded.