Bentaib, A.

Gabrielli, F.

Herranz, L. E.

Kljenak, I.

Paci, Sandro

Piluso, P.

Rocchi, F.

L. E. Herranz

A. Bentaib

I. Kljenak

F. Gabrielli

Sandro Paci

P. Piluso

F. Rocchi

Archivio della Ricerca - Università di Pisa

28/05/202011 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&Dwww.nugenia.orgSevere Accident Research Priorities:Need for actionETSON/ERG MeetingMay 29th, 2020L.E. Herranz (CIEMAT), A. Bentaib (IRSN), I. Kljenak(JSI), F. Gabrielli (KIT), S. Paci (Univ. of Pisa), P. Piluso (CEA),           F. Rocchi (ENEA)2 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DOUTLINE Background Motivation Current Framework Present NUGENIA-TA2 Final Remarks28/05/202023 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DBackground4 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DThe EURSAFE Project (2001-2003) In-vessel melt retention Ex-vessel melt retention Dynamic or long-term containment loading  Source term Systematic and quantitative PIRT methodology. Domains 21 areas highlighted as requiring furhter work• H2 generation during reflood or melt relocation • Integrity of RCS• Oxidizing environment impact on source term• … (Importance ratio based on safety relevance and knowledge)28/05/202035 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DThe SARNET View (2013) The instrumentation for severe accidents; the maintenance of reactor pressure vessel (RPV) integrity by external vessel cooling; the RPV vessel failure mode; and the subsequent corium release from the failed vessel. The mixing of hydrogen in the containment (and reactor building) atmosphere, possible hydrogen combustion/detonation processes and the influence of countermeasures like recombines or the effect of spray systems.  The characterization and quantification of FP release under oxidation conditions and in particular air ingress for high burn-up and MOX fuel High temperature chemistry in the Reactor Coolant System (RCS) and its impact on the ST Methodology: SARNET-based Expert judgement6 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DThe Latest update (2019) Methodology: Experts’ update based on recent developments  Most SA research topics continue with the same priority level, with a few exceptions. Highlighted research areas:- Corium behavior in LP.- Integrity of RPV due to EVC- RPV failure mode (BWR)- H2 combustion- Melt reloc. in water & part. formation- Melt spreading underwater (FCI)- Stratified oxidic/metallic  MCCI- Ex-V corium coolability (TopF)- High T chemistry- Oxidizing chem. In RCB)- FA behavior in SFP - Instrumentation for SA- LT SAMgmt - Methodologies for SA analysis28/05/202047 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DMotivation8 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&D Available resources are being reduced. High-value expertise in the field is disappearing. TA2 expert pool on SA is a unique platform. Key activities ongoing: EC-MUSA; OECD projects. Expert judgement is “biased” and not exhaustive. Need to focus on: predictability & AMgmt Much achieved, but still “black holes” (F). Critical view of current situation is missing (DB;SAC).• Predictability (investment  efficient uncertainties reduction)• Accident management (a key axis of the SARP methodology)28/05/202059 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DActivity Proposal(under construction)10 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&D A 2-level approach: Project to be coordinated by TA2. Three-year duration.• Severe accident progression (AM included)  Safety relevance.• Phenomena domain  Assessment of existing knowledge. Three phases:1. Set up of methodology & experts pools.2. Develop individual groups work.3. Sharing work, evaluation and settling conclusions Multiple “discussion and hands-on” mtgs foreseen28/05/2020611 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DFinal Remarks12 www.nugenia.org NUGENIA is mandated by SNETP to coordinate nuclear Generation II & III R&DThank you for your attention!Thank you for making TA2 a reality!

English

Severe Accident Research Priorities: Need for action

Severe Accident Research Priorities: Need for action

Abstract

Similar works

Full text

Available Versions

Archivio della Ricerca - Università di Pisa