Integral Experiments Data, Databases, Benchmarks and Safety Joint Projects
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MASCA, In-vessel phenomena during severe accidents

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Program name Package id Status Status date
MASCA CSNI2008/01 Arrived 12-FEB-2007

Machines used:

Package ID Orig. computer Test computer
CSNI2008/01 Many Computers
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The MASCA Project was a follow-up of the RASPLAV Project and investigated in-vessel phenomena during a severe accident. In particular, it addressed the influence of the chemical composition of the molten corium on the heat transfer to the pressure vessel environment. The project addressed this by investigating stratification phenomena of the molten pool and the partitioning of fission products (FP) within the different layers of the melt. The project was scheduled to be completed in July 2003, but it was continued until 2006 under the MACS-2 Project, given the experimental needs that still exist and the quality of the experimental work done so far.


The tests aimed to resolve remaining uncertainties about the heat load on the reactor vessel and thus the possibility of retaining the melt in the vessel. These uncertainties are mainly associated with scaling effects and coupling between the thermal-hydraulic and chemical behaviour of the melt. Supporting experiments and analyses - in addition to helping understand key in-vessel phenomena - facilitated a consistent interpretation of the results. The experiments were carried out with corium compositions prototypical of power reactors which use iron and steel materials. The MASCA experimental goal was achieved through corium tests of different scale, and was complemented by pre- and post-test analyses and development of computational models. Additional measurements of thermo-physical properties of the melts such as density, thermal conductivity and liquidus-solidus temperatures considerably expanded the material properties data obtained during the RASPLAV Project.


The major goals of the MASCA Project were to:

  • Investigate the influence of chemical behaviour on heat transfer in stratified molten pools of prototypical compositions;

  • Investigate FP behaviour in a molten pool and in particular:

    • Partitioning of FP between layers in case of stratification;

    • Partitioning of FP between phases during melting and solidification;

    • Distribution of FP simulants in the melts.

  • Expand the material properties database;

  • Develop computer models describing the relevant phenomena.

Separate effects were studied in series of small- and mid-scale experiments. Corium tests were performed in the RASPLAV, TULPAN, TF, STF, KORPUS, and TIGEL facilities. Salt tests were performed in the present RASPLAV-Salt facility.


Participating countries:
Belgium, Canada, Czech Republic, Finland, France, Germany, Hungary, Italy, Japan, Netherlands, Republic of Korea, Russia, Spain, Sweden, Switzerland, United Kingdom, United States.


Project period: July 2000-July 2003 (extended until 2006 as the MASCA-2 project).


The distribution of this package is restricted and subject to prior approval.


For more detailed information visit

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Package ID Status date Status
CSNI2008/01 12-FEB-2007 Masterfiled restricted
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CSNI2008/01, included references:
- Main Results of the First Phase of MASCA Project, May 2004 (MASCA1 Integrated
- V.Asmolov, V.Asmolov, V. Khabensky, S. Bechta, V.Gusarov, S.Vitol,
Ye.Krushinov, Yu.Degaltsev, V.Vlasov, Yu. Utkin:
MA-1 Experiment: Post-Test Analysis Results, MP-TR-1, November 2001
- V.Asmolov, Yu.Degaltsev, E.Dyakov, Yu.Kotov, V. Repnikov, T. Trushkina,
V.Vlasov, V.Vishnevskiy, Yu.Utkin, V.Zagryazkin:
Study of Carbon and Separation Impact on Suboxidised Corium Stratification,
MP-TR-2, June 2001
- V.Asmolov, V.Vlasov, V.Gubankov, Yu.Degaltsev, A.Kiselev, M.Krutov,
B.Lobovsky, V.Pavlov, Ye.Samarin. V.Sokolov, Yu.Utkin, A.Filippov,
I.Khazanovich, V.Chernyshov, V.Churin:
TULPAN T-7 Test Results, MP-TR-3, October 2001
- V.Chudanov, V.Strizhov, A.Surenkov, I.Gnidoy, D.Chuvilin:
Scaling Analysis and Proposal of MASCA Salt Test Programme, MP-TR-4, November
- V.G. Asmolov, Yu.G.Degaltsev, O.Ya. Shakh, S.S. Abalin, I.M. Semenov, I.F.
Isaev, K.V. Pechalin, B.L. Gershman, A.Ye.Ignatochkin, A.B. Grafskiy, V.V.
Vlasov, Yu.M. Utkin, A.M. Kovalev:
Study of the Molten Metal Migration in the Oxide Porous Matrix, MP-TR-5, July
- V.G. Asmolov, V.B. Khabensky, S.V. Bechta, S.A. Vitol, E.V. Krushinov, S.Yu.
Kotova, E.K. Kalyago, N.E. Kamensky, A.V. Lysenko, V.G. Bliznyuk, V.R. Bulygin,
E.V. Shevchenko, V.S. Granovsky, V.V. Martynov, V.V. Gusarov, V.I. Al'myashev,
M.D. Tolkachyov, M.R. Pavlov, V.V. Vlasov, Yu.G. Degaltsev, Yu.M. Utkin:
The MA-2 Experiment: Zirconium and Uranium Partitioning between Oxide and
Metallic Phases of Molten Corium, MP-TR-6, March 2002
- V.G.Asmolov, Ye.V. Astahova, V.Yu.Vishnevskiy, E.K.Dyakov, V.N. Zagryazkin,
A.Yu. Kotov, V.M. Repnikov:
Investigation of B4C Impact on U-Zr-O Corium Stratification and the Processes
of Its Interaction with the Melt Based on Fe, MP-TR-7, September 2002
- V.G. Asmolov, Ye.V. Astahova, V.Yu. Vishnevskiy, Yu.G.Degaltsev, E.K. Dyakov,
V.N. Zagryazkin, A.Yu. Kotov, V.M. Repnikov, T.V. Trushkina, Yu.M. Utkin, V.O.
Study of the Liquid Steel Behaviour in the Molten Corium in STFMFe Test Series,
MP-TR-8, February 2003
- V.Asmolov, V.Khabensky, S.Bechta, Ye.Krushinov, S.Vitol, V.Gusarov,
S.Yu.Kotova, V.Almyashev, Yu.Degaltsev:
The MA-3 and MA-4 Tests: Zirconium and Uranium Partitioning between Oxide and
Metallic Phases of Molten Corium, MP-TR-9, February 2003
- V.G.Asmolov, Ye.V. Astahova, V.Yu. Vishnevskiy, E.K. Dyakov, V.N. Zagryazkin,
A.Yu. Kotov, V.M. Repnikov, V.S.Uglov, Yu.G.Degaltsev, Yu.M.Utkin,
Partitioning of Fission Products between the Corium Melt Metallic and Oxidic
Phases Resulting from the STFM-FP Tests, MP-TR-10, June 2003
- V.G. Asmolov, S.S. Abalin, Yu.A.Veselkin, V.Yu. Vishnevskiy, V.V. Vlasov,
Yu.G. Degaltsev, Ye.K. Dyakov, I.F. Isaev, A.N. Kiselev, N.P. Kiselev, A.M.
Kovalev, A.G. Ol'khovsky, K.V. Pechalin, I.M. Semenov, V.F. Strizhov, T.V.
Trushkina, V.S. Uglov, Yu.M. Utkin, V.V. Chudanov, A.E. Aksenova, V.A.
Pervichko, I.M. Khazanovich
RCW Post-Test Analysis Results, MP-TR-11, September 2003
- V.Asmolov, S.Abalin, S.Bechta, A.Merzlyakov, V.Vishnevsky, A.Kotov,
Measurement of Physical Properties, MP-TR-12, June 2003
- V.Asmolov, S.Abalin, A.Surenkov, I.Gnidoy, B.Barkovsky, N.Komissarova,
D.Chuvilin, Yu.Rybakov, V.Strizhov, V.Semenov:
Study of Thermal Hydraulic Processes in a Stratified Molten Pool, MP-TR-13,
December 2003
- MASCA June 2004 Seminar Proceedings
- MASCA Project (2000-2003)/Vol.1&2, Proceedings of the MASCA Seminar 2004
Aix-en-Provence, France, 10-11 June 2004
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Russian Research Centre
Kurchatov Institute
Kurchatov sq., 1
Moscow 123182
Russian Federation

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Reports on the experiments carried out
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  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: accidents, core meltdown, corium, heat transfer, pressure vessels.