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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.

Call for proposal

NFRP-2014-2015
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Funding Scheme

RIA - Research and Innovation action

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
€ 840 130

Participants (23)

UJV REZ, a. s.
Czechia
EU contribution
€ 663 397
Address
Hlavni 130, Rez
250 68 Husinec
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
JRC -JOINT RESEARCH CENTRE- EUROPEAN COMMISSION
Belgium
EU contribution
€ 293 215
Address
Rue De La Loi 200
1049 Brussels
Activity type
Research Organisations
COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
France
EU contribution
€ 550 682
Address
Rue Leblanc 25
75015 Paris 15
Activity type
Research Organisations
KUNGLIGA TEKNISKA HOEGSKOLAN
Sweden
EU contribution
€ 1 078 701
Address
Brinellvagen 8
100 44 Stockholm
Activity type
Higher or Secondary Education Establishments
KARLSRUHER INSTITUT FUER TECHNOLOGIE
Germany
EU contribution
€ 319 937
Address
Kaiserstrasse 12
76131 Karlsruhe
Activity type
Higher or Secondary Education Establishments
AREVA NP SAS

Participation ended

France
EU contribution
€ 57 879
Address
1 Place Jean Millier Tour Areva
92400 Courbevoie
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
ELECTRICITE DE FRANCE
France
EU contribution
€ 125 044
Address
Avenue De Wagram 22
75008 Paris 08
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
GESELLSCHAFT FUR ANLAGEN UND REAKTORSICHERHEIT (GRS) gGmbH
Germany
EU contribution
€ 0
Address
Schwertnergasse 1
50667 Koln
Activity type
Research Organisations
HELMHOLTZ-ZENTRUM DRESDEN-ROSSENDORF EV
Germany
EU contribution
€ 96 600
Address
Bautzner Landstrasse 400
01328 Dresden
Activity type
Research Organisations
Fortum Power and Heat Oy
Finland
EU contribution
€ 47 812
Address
Keilanimentie 1
00048 Espoo
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Finland
EU contribution
€ 80 456
Address
Tekniikantie 21
02150 Espoo
Activity type
Research Organisations
ENERGIATUDOMANYI KUTATOKOZPONT
Hungary
EU contribution
€ 46 000
Address
Konkoly Thege Miklos Ut 29-33
1121 Budapest
Activity type
Research Organisations
NUBIKI Nuclear Safety Research Institute Ltd.
Hungary
EU contribution
€ 45 375
Address
Konkoly Thege Miklos Utca 29 33 6 Ep
1121 Budapest
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
INZINIERSKA VYPOCTOVA SPOLOCNOST TRNAVA S.R.O.
Slovakia
EU contribution
€ 108 500
Address
Jana Holleho 5
917 01 Trnava
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
AGENZIA NAZIONALE PER LE NUOVE TECNOLOGIE, L'ENERGIA E LO SVILUPPO ECONOMICO SOSTENIBILE
Italy
EU contribution
€ 109 125
Address
Lungotevere Grande Ammiraglio Thaon Di Revel 76
000196 Roma
Activity type
Research Organisations
LIETUVOS ENERGETIKOS INSTITUTAS
Lithuania
EU contribution
€ 28 875
Address
Breslaujos G. 3
LT-44403 Kaunas
Activity type
Research Organisations
TRACTEBEL ENGINEERING
Belgium
EU contribution
€ 7 875
Address
Boulevard Simon Bolivar 34 - 36
1000 Bruxelles
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE
United Kingdom
EU contribution
€ 58 030
Address
South Kensington Campus Exhibition Road
SW7 2AZ London
Activity type
Higher or Secondary Education Establishments
NUCLEAR RESEARCH AND CONSULTANCY GROUP
Netherlands
EU contribution
€ 69 825
Address
Westerduinweg 3
1755 LE Petten
Activity type
Other
INSTITUTE OF NUCLEAR RESEARCH AND NUCLEAR ENERGY - BULGARIAN ACADEMY OF SCIENCES
Bulgaria
EU contribution
€ 41 400
Address
Tzarigradsko Shose 72
1784 Sofia
Activity type
Research Organisations
CENTRUM VYZKUMU REZ SRO
Czechia
EU contribution
€ 80 000
Address
Hlavni 130
250 68 Husinec-rez
Activity type
Research Organisations
NARODOWE CENTRUM BADAN JADROWYCH
Poland
EU contribution
€ 57 600
Address
Ulica Andrzeja Soltana 7
05 400 Otwock
Activity type
Research Organisations
FRAMATOME
France
EU contribution
€ 24 996
Address
1 Place Jean Millier Tour Areva
92400 Courbevoie
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)