In WP1 ‘Critical review’, a critical review of the available literature regarding (1) PAR efficiency under ex-vessel conditions, (2) existing PWR SAMGs regarding containment risk management (3) H2/CO combustion and the available engineering correlations for combustion risk estimation, and (4) equipment and instrumentation surveillance under severe accident conditions has been performed. A public deliverable (D1.1) reviewed by externals, has been published. One conference paper for NURETH2025 is under preparation.
In WP2 ‘Selection of severe accident sequences’, the two main tasks have been achieved successfully. On one hand, the PWR-W, PWR-KWU and PWR-VVER generic models have been developed, being documented extensively in the public deliverable D.2.1. On the other hand, a broad number of severe accident sequences for the three types of reactor have been performed with Lumped Parameters (LP) codes such as MELCOR, ASTEC or COCOSYS. As a consequence, an outstanding database on H2/CO scenarios of interest for the three types of PWR containments (KWU, W and VVER) have been developed. The sequences were documented in the public deliverable D2.2 together with the lessons learned. Several conference papers were published (see “publications”) and two journal papers are under preparation.
In WP3 ‘Experimental investigations’, the experiments on flammability limits and turbulent flames were done for the data that had a clear knowledge gap in the literature or no data available at all. For the second task, the PAR experiments in the REKO facilities have been performed to validate numerical PAR models. The public deliverables D3.1 and D3.2 were issued. Several journal and conference papers have been already published and some more are under preparation.
In WP4 ‘Full containment analysis’, new simulation models from the generic containment database of WP2 were created for three different modelling approaches: LP, 3D and CFD. Afterwards, a significant amount of sequences for LP codes were performed, investigating the impact of safety systems such as containment sprays, fan coolers, filtered venting systems and PARs was investigated regarding combustion risk in the containment. Very valuable lessons learned were taken from the 3 approaches comparison, which have been documented in D4.2 (restricted) and D4.3 (public). Additionally, relevant work was done to create better estimations of the combustion risk in the late phase of accidents learning from the WP3 experimental combustion data. This work has been documented in D4.1. From this WP, one journal paper was published, several conference papers were issued and other ones are under preparation.
The WP5 ‘Enhancement of severe accident management guidelines’ was designed as the interface from academic research and numerical simulations into industrial application. During its work, the results of these preceding work packages were reviewed, the applicability to existing European pressurized water reactor types (PWR-W, PWR-KWU, PWR-VVER) confirmed, and the results presented in a language commonly used in the industrial framework. The main outputs of this WP were: 1) enhanced technical accident management (AM) measures based on results achieved in the project; 2) a translation into practical AM measures in which human error is minimized as far as possible; and 3) recommendations for long term operation (LTO) upgrades to comply with the proposed AM measures above.
In WP6 ‘Dissemination, communication, education and training’, many activities took place: workshops with PhD students, students mobility programme, defences of PhD thesis, AMHYCO students being awarded for their work, participation at many events and conferences. From the start of the project, AMHYCO was present at 23 scientific conferences, had 49 conference proceedings/papers and presentations, and 5 peer-review journal papers (2 additional papers are currently under review and 10 are under preparation).
