Analyses on ex-vessel debris formation and coolability in SARNET frame

G. Pohlner, M. Buck, R. Meignen, P. Kudinov, W. Ma, F. Polidoro, Eveliina Takasuo

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The major aim of work in the SARNET2 European project on ex-vessel debris formation and coolability was to get an overall perspective on coolability of melt released from a failed reactor pressure vessel and falling into a water-filled cavity. Especially, accident management concepts for BWRs, dealing with deep water pools below the reactor vessel, are addressed, but also shallower pools in existing PWRs, with questions about partial cooling and time delay of molten corium concrete interaction. The subject can be divided into three main topics: (i) Debris bed formation by breakup of melt, (ii) Coolability of debris and (iii) Coupled treatment of the processes. Accompanied by joint collaborations of the partners, the performed work comprises theoretical, experimental and modelling activities.Theoretical work was done by KTH on the melt outflow conditions from a RPV and on the quantification of the probability of yielding a non-coolable ex-vessel bed by use of probabilistic assessment.IKE introduced a theoretical concept to improve debris bed coolability. A large amount of experimental work was done by partners (KTH, VTT, IKE) on the coolability of debris beds using different bed geometries, particles, heating methods and water feeds, yielding a valuable base for code validation. Modelling work was mainly done by IKE, IRSN, RSE and VTT concerning jet breakup and/or debris bed formation and cooling in 2D and 3D geometries. A benchmark for the DEFOR-A experiment of KTH was performed.Important progress was reached for several tasks and aspects and important insights are given, enabling to focus the view on possible key aspects of future activities.
Original languageEnglish
Pages (from-to)50-57
JournalAnnals of Nuclear Energy
Volume74
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed
Event6th European Review meeting on Severe Accident Research, ERMSAR-2013 - Avignon, France
Duration: 2 Oct 20134 Oct 2013
Conference number: 6

Fingerprint

Debris
Cooling
Water
Geometry
Pressure vessels
Molten materials
Time delay
Accidents
Concretes
Heating
Experiments

Keywords

  • nuclear power plants
  • severe accidents
  • melt fragmentation
  • debris bed formation
  • debris coolability
  • multidimensional modelling
  • code validation

Cite this

Pohlner, G., Buck, M., Meignen, R., Kudinov, P., Ma, W., Polidoro, F., & Takasuo, E. (2014). Analyses on ex-vessel debris formation and coolability in SARNET frame. Annals of Nuclear Energy, 74, 50-57. https://doi.org/10.1016/j.anucene.2014.07.013
Pohlner, G. ; Buck, M. ; Meignen, R. ; Kudinov, P. ; Ma, W. ; Polidoro, F. ; Takasuo, Eveliina. / Analyses on ex-vessel debris formation and coolability in SARNET frame. In: Annals of Nuclear Energy. 2014 ; Vol. 74. pp. 50-57.
@article{03b34d08aeb84b4894fa9762208847a7,
title = "Analyses on ex-vessel debris formation and coolability in SARNET frame",
abstract = "The major aim of work in the SARNET2 European project on ex-vessel debris formation and coolability was to get an overall perspective on coolability of melt released from a failed reactor pressure vessel and falling into a water-filled cavity. Especially, accident management concepts for BWRs, dealing with deep water pools below the reactor vessel, are addressed, but also shallower pools in existing PWRs, with questions about partial cooling and time delay of molten corium concrete interaction. The subject can be divided into three main topics: (i) Debris bed formation by breakup of melt, (ii) Coolability of debris and (iii) Coupled treatment of the processes. Accompanied by joint collaborations of the partners, the performed work comprises theoretical, experimental and modelling activities.Theoretical work was done by KTH on the melt outflow conditions from a RPV and on the quantification of the probability of yielding a non-coolable ex-vessel bed by use of probabilistic assessment.IKE introduced a theoretical concept to improve debris bed coolability. A large amount of experimental work was done by partners (KTH, VTT, IKE) on the coolability of debris beds using different bed geometries, particles, heating methods and water feeds, yielding a valuable base for code validation. Modelling work was mainly done by IKE, IRSN, RSE and VTT concerning jet breakup and/or debris bed formation and cooling in 2D and 3D geometries. A benchmark for the DEFOR-A experiment of KTH was performed.Important progress was reached for several tasks and aspects and important insights are given, enabling to focus the view on possible key aspects of future activities.",
keywords = "nuclear power plants, severe accidents, melt fragmentation, debris bed formation, debris coolability, multidimensional modelling, code validation",
author = "G. Pohlner and M. Buck and R. Meignen and P. Kudinov and W. Ma and F. Polidoro and Eveliina Takasuo",
year = "2014",
doi = "10.1016/j.anucene.2014.07.013",
language = "English",
volume = "74",
pages = "50--57",
journal = "Annals of Nuclear Energy",
issn = "0306-4549",
publisher = "Elsevier",

}

Pohlner, G, Buck, M, Meignen, R, Kudinov, P, Ma, W, Polidoro, F & Takasuo, E 2014, 'Analyses on ex-vessel debris formation and coolability in SARNET frame', Annals of Nuclear Energy, vol. 74, pp. 50-57. https://doi.org/10.1016/j.anucene.2014.07.013

Analyses on ex-vessel debris formation and coolability in SARNET frame. / Pohlner, G.; Buck, M.; Meignen, R.; Kudinov, P.; Ma, W.; Polidoro, F.; Takasuo, Eveliina.

In: Annals of Nuclear Energy, Vol. 74, 2014, p. 50-57.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Analyses on ex-vessel debris formation and coolability in SARNET frame

AU - Pohlner, G.

AU - Buck, M.

AU - Meignen, R.

AU - Kudinov, P.

AU - Ma, W.

AU - Polidoro, F.

AU - Takasuo, Eveliina

PY - 2014

Y1 - 2014

N2 - The major aim of work in the SARNET2 European project on ex-vessel debris formation and coolability was to get an overall perspective on coolability of melt released from a failed reactor pressure vessel and falling into a water-filled cavity. Especially, accident management concepts for BWRs, dealing with deep water pools below the reactor vessel, are addressed, but also shallower pools in existing PWRs, with questions about partial cooling and time delay of molten corium concrete interaction. The subject can be divided into three main topics: (i) Debris bed formation by breakup of melt, (ii) Coolability of debris and (iii) Coupled treatment of the processes. Accompanied by joint collaborations of the partners, the performed work comprises theoretical, experimental and modelling activities.Theoretical work was done by KTH on the melt outflow conditions from a RPV and on the quantification of the probability of yielding a non-coolable ex-vessel bed by use of probabilistic assessment.IKE introduced a theoretical concept to improve debris bed coolability. A large amount of experimental work was done by partners (KTH, VTT, IKE) on the coolability of debris beds using different bed geometries, particles, heating methods and water feeds, yielding a valuable base for code validation. Modelling work was mainly done by IKE, IRSN, RSE and VTT concerning jet breakup and/or debris bed formation and cooling in 2D and 3D geometries. A benchmark for the DEFOR-A experiment of KTH was performed.Important progress was reached for several tasks and aspects and important insights are given, enabling to focus the view on possible key aspects of future activities.

AB - The major aim of work in the SARNET2 European project on ex-vessel debris formation and coolability was to get an overall perspective on coolability of melt released from a failed reactor pressure vessel and falling into a water-filled cavity. Especially, accident management concepts for BWRs, dealing with deep water pools below the reactor vessel, are addressed, but also shallower pools in existing PWRs, with questions about partial cooling and time delay of molten corium concrete interaction. The subject can be divided into three main topics: (i) Debris bed formation by breakup of melt, (ii) Coolability of debris and (iii) Coupled treatment of the processes. Accompanied by joint collaborations of the partners, the performed work comprises theoretical, experimental and modelling activities.Theoretical work was done by KTH on the melt outflow conditions from a RPV and on the quantification of the probability of yielding a non-coolable ex-vessel bed by use of probabilistic assessment.IKE introduced a theoretical concept to improve debris bed coolability. A large amount of experimental work was done by partners (KTH, VTT, IKE) on the coolability of debris beds using different bed geometries, particles, heating methods and water feeds, yielding a valuable base for code validation. Modelling work was mainly done by IKE, IRSN, RSE and VTT concerning jet breakup and/or debris bed formation and cooling in 2D and 3D geometries. A benchmark for the DEFOR-A experiment of KTH was performed.Important progress was reached for several tasks and aspects and important insights are given, enabling to focus the view on possible key aspects of future activities.

KW - nuclear power plants

KW - severe accidents

KW - melt fragmentation

KW - debris bed formation

KW - debris coolability

KW - multidimensional modelling

KW - code validation

UR - https://www.sciencedirect.com/journal/annals-of-nuclear-energy/vol/74/suppl/C

U2 - 10.1016/j.anucene.2014.07.013

DO - 10.1016/j.anucene.2014.07.013

M3 - Article

VL - 74

SP - 50

EP - 57

JO - Annals of Nuclear Energy

JF - Annals of Nuclear Energy

SN - 0306-4549

ER -