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pubblicazioni - Presentazione

The European PASSAM Project on severe accident source term mitigation: presentation and first outcomes

pubblicazioni - Presentazione

The European PASSAM Project on severe accident source term mitigation: presentation and first outcomes

Il progetto europeo “PASSAM – Passive and Active Systems on Severe Accident source term Mitigation” (7th FWP EURATOM), qui presentato, è stato costruito per esplorare i potenziali miglioramenti dei dispositivi di mitigazione esistenti e dimostrare la capacità dei sistemi innovativiper ottenere una maggiore ritenzione. In questo lavoro è presentato lo stato del progetto dopo circa un anno e mezzo dal suo avvio (Gennaio 2013- Settembre 2014).

The PASSAM project has been mounted in the frame of the 7th framework programme of the European Commission. Coordinated by IRSN, this four year project (2013 – 2016) involves nine partners from six countries having a strong experience on severe accidents: IRSN, EDF and university of Lorraine (France); CIEMAT and CSIC (Spain); PSI (Switzerland); RSE (Italy); VTT (Finland) and AREVA GmbH (Germany).It is focused on mitigation systems in case of severe accident intended for reducing potential radioactive atmospheric releases to the environment.

The PASSAM project is mainly of R&D experimental nature, aiming at:- exploring potential enhancement of existing source term mitigation devices,- demonstrating the ability of innovative systems to achieve larger source term attenuation.

To achieve these objectives, the PASSAM project is organized into 5 Work Packages (WP):

  • the 1st one on project management;
  • the 2nd one on drafting a state-of-the-art report on filtration systems used or potentially usable for source term mitigation of severe accidents and on performing in depth analysis of experimental results up to proposing correlations and/or simple models;
  • the 3rd one on experimental studies of existing filtration systems (pool scrubbing systems; sand bed filters plus metallic pre-filters);
  • the 4th one on experimental studies of innovative filtration systems (Acoustic agglomeration systems; Spray agglomeration systems; Electric filtration systems; Improved zeolite filtration systems; Combined Filtration Systems);
  • the 5th one on dissemination of knowledge and on project synthesis.The current status of the project, which will be presented at the NUSSA-2014 Workshop, is as follows.

The state-of-the-art report is now completed, allowing a precise definition of the experimental test matrices in direct link with the identified gaps of knowledge. The experimental work is ongoing and in some domains (e.g. pool hydrodynamics, acoustic agglomeration systems, use of zeolites for iodine trapping, combined wet and dry filtrations systems) first interesting results have been obtained. Among the activities on dissemination of knowledge, we can quote the organization of two open workshops mainly targeted to R&D organizations, to National Safety Authorities and their Technical Support Organizations, to utilities and to vendors. The first one was held on February 26th, 2014 in Madrid.

The second one will be organised at the end of the project, in December 2016.The project’s final outcomes will constitute a valuable database which may be strategic for helping the utilities on the decision of implementing and/or enhancing mitigation systems on their reactors and for improving severe accident management. Robustness features for each type of mitigation system studied will be evaluated to increase the reliability of operation in severe accident conditions.Simple models and/or correlations will result from in-depth analysis of PASSAM experimental results. Once implemented in accident analysis codes, these models should allow enhancing the capability of modelling Severe Accident Management scenarios and developing improved guidelines.