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In-Vessel Melt Retention Severe Accident Management Strategy for Existing and Future NPPs

In-Vessel Melt Retention Severe Accident Management Strategy for Existing and Future NPPs

Objective

The stabilization of molten corium is recognised as essential if a safe and stable state is to be reached following a severe accident. Among the possible options, In-Vessel Melt Retention (IVMR) appears as an attractive solution that would minimize the risks of containment failure (less Hydrogen produced, no corium-concrete interaction), if it can be proved to be feasible.
The strategy is already adopted for the VVER 440 type 213 based on thorough research work for the Finnish Loviisa NPP and Hungarian Paks NPP. It is also included in the design of some new Gen.III reactors like AP-1000, APR 1400 and Chinese CPR-1000. It has also been studied in the past for other reactor concepts like KERENA (BWR) or VVER-640.
Current approaches for reactors with relatively small power, such as VVER 440 or AP600, use conservative assumptions. However, for higher power reactors (around 1000 MWe), it is necessary to evaluate the IVMR strategy with best-estimate methods in order to address the uncertainties associated with the involved phenomena. Additional R&D is needed to ensure and demonstrate adequate safety margins, including identification of efficient technical solutions for the external cooling of the vessel and performing best-estimate evaluation of relevant scenarios. Among other provisions, the possibility of cooling the corium inside the vessel by direct injection of water into the degraded core, may be considered because it is likely to remove a significant part of the residual power.
The goal of the project is an analysis of the applicability and technical feasibility of the IVMR strategy to high power reactors, both for existing ones (e.g. VVER 1000 type 320 units) as well as for future reactors of different types (PWR or BWR). The main outcomes of the project will be elevant assumptions and scenarios to estimate the maximum heat load on the vessel wall, improved numerical tools for the analysis of IVMR issues and a harmonized methodology on the IVMR.

Coordinator

INSTITUT DE RADIOPROTECTION ET DE SURETE NUCLEAIRE

Address

Av De La Division Leclerc 31
92260 Fontenay Aux Roses

France

Activity type

Research Organisations

EU Contribution

€ 803 180

Participants (22)

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UJV REZ, a. s.

Czechia

EU Contribution

€ 644 085

JRC -JOINT RESEARCH CENTRE- EUROPEAN COMMISSION

Belgium

EU Contribution

€ 321 726

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

France

EU Contribution

€ 550 120

KUNGLIGA TEKNISKA HOEGSKOLAN

Sweden

EU Contribution

€ 1 077 576

KARLSRUHER INSTITUT FUER TECHNOLOGIE

Germany

EU Contribution

€ 319 375

AREVA NP SAS

France

EU Contribution

€ 82 500

ELECTRICITE DE FRANCE

France

EU Contribution

€ 111 719

GESELLSCHAFT FUR ANLAGEN UND REAKTORSICHERHEIT (GRS) gGmbH

Germany

HELMHOLTZ-ZENTRUM DRESDEN-ROSSENDORF EV

Germany

EU Contribution

€ 96 000

Fortum Power and Heat Oy

Finland

EU Contribution

€ 47 437

Teknologian tutkimuskeskus VTT Oy

Finland

EU Contribution

€ 79 856

MAGYAR TUDOMANYOS AKADEMIA ENERGIATUDOMANYI KUTATOKOZPONT

Hungary

EU Contribution

€ 46 000

NUBIKI Nuclear Safety Research Institute Ltd.

Hungary

EU Contribution

€ 45 000

INZINIERSKA VYPOCTOVA SPOLOCNOST TRNAVA S.R.O.

Slovakia

EU Contribution

€ 98 125

AGENZIA NAZIONALE PER LE NUOVE TECNOLOGIE, L'ENERGIA E LO SVILUPPO ECONOMICO SOSTENIBILE

Italy

EU Contribution

€ 108 750

LIETUVOS ENERGETIKOS INSTITUTAS

Lithuania

EU Contribution

€ 28 500

TRACTEBEL ENGINEERING

Belgium

EU Contribution

€ 7 500

IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE

United Kingdom

EU Contribution

€ 125 905

NUCLEAR RESEARCH AND CONSULTANCY GROUP

Netherlands

EU Contribution

€ 69 300

INSTITUTE OF NUCLEAR RESEARCH AND NUCLEAR ENERGY - BULGARIAN ACADEMY OF SCIENCES

Bulgaria

EU Contribution

€ 40 800

CENTRUM VYZKUMU REZ SRO

Czechia

EU Contribution

€ 80 000

NARODOWE CENTRUM BADAN JADROWYCH

Poland

EU Contribution

€ 48 000

Project information

Grant agreement ID: 662157

Status

Closed project

  • Start date

    1 June 2015

  • End date

    31 May 2019

Funded under:

H2020-Euratom-1.8.

H2020-Euratom-1.3.

H2020-Euratom-1.1.

  • Overall budget:

    € 8 205 085

  • EU contribution

    € 4 831 454

Coordinated by:

INSTITUT DE RADIOPROTECTION ET DE SURETE NUCLEAIRE

France

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