SASPAM-SA: Assessment of the relevance and applicability of existing experimental databases to iPWR

One of the objectives of SASPAM-SA, in particular Work Package 3 (Applicability and Transfer of the Existing SA experimental database for iPWR Assessment), is to evaluate the relevance and applicability of the existing experimental database to iPWR. Based on postulated plant severe accident scenarios, identified and investigated in the project, the main boundary conditions and the specific features of iPWR are determined and compared to those of large LWR. Based on this comparison, the applicability of the existing experimental data to iPWR is assessed for in-vessel, containment, source term and ex-vessel coolability (if applicable) phenomena. The specific data to be evaluated include, e.g., natural circulation, debris bed formation, liquid melt spreading, steam explosion, re-flooding of an overheated core, in-vessel melt pool formation, corium cooling under water, hydrogen distribution, combustion and mitigation, aerosol characteristics, transport and hygroscopic growth, iodine speciation and mitigation, as well as pool scrubbing. If needed, methods will be developed to extend the applicability of existing data. Finally, the potential need for new experiments is determined. In this paper, a summary of the work done during the first project year is given.