Reinforced concrete wall under hydrogen detonation

Research output: Book/ReportReport

Abstract

The structural integrity of a reinforced concrete wall in the BWR reactor building under hydrogen detonation conditions has been analysed. Of particular interest is whether the containment integrity can be jeopardised by an external hydrogen detonation. The load carrying capacity of a reinforced concrete wall was studied. The detonation pressure loads were estimated with computerised hand calculations assuming a direct initiation of detonation and applying the strong explosion theory. The results can be considered as rough and conservative estimates for the first shock pressure impact induced by a reflecting detonation wave. Structural integrity may be endangered due to slow pressurisation or dynamic impulse loads associated with local detonations. The static pressure following the passage of a shock front may be relatively high, thus this static or slowly decreasing pressure after a detonation may damage the structure severely. The mitigating effects of the opening of a door on pressure history and structural response were also studied. The non-linear behaviour of the wall was studied under detonations corresponding a detonable hydrogen mass of 0.5 kg and 1.428 kg. Non-linear finite element analyses of the reinforced concrete structure were carried out by the ABAQUS/Explicit program. The reinforcement and its non-linear material behaviour and the tensile cracking of concrete were modelled. Reinforcement was defined as layers of uniformly spaced reinforcing bars in shell elements. In these studies the surrounding structures of the non-linearly modelled reinforced concrete wall were modelled using idealised boundary conditions. Especially concrete cracking and yielding of the reinforcement was monitored during the numerical simulation.
Original languageEnglish
Number of pages50
ISBN (Electronic)87-7893-077-4
Publication statusPublished - 1 Nov 2000
MoE publication typeD4 Published development or research report or study

Publication series

SeriesNKS Nordisk Kärnsäkerhetsforskning, NKS
NumberNKS-26

Fingerprint

Detonation
Reinforced concrete
Hydrogen
Reinforcement
Structural integrity
Concretes
Boiling water reactors
Pressurization
ABAQUS
Load limits
Concrete construction
Explosions
Boundary conditions
Computer simulation

Keywords

  • non-linear reinforced concrete
  • hydrogen detonation
  • finite element analysis

Cite this

Saarenheimo, A. (2000). Reinforced concrete wall under hydrogen detonation. NKS Nordisk Kärnsäkerhetsforskning, NKS, No. NKS-26
Saarenheimo, Arja. / Reinforced concrete wall under hydrogen detonation. 2000. 50 p. (NKS Nordisk Kärnsäkerhetsforskning, NKS; No. NKS-26).
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Saarenheimo, A 2000, Reinforced concrete wall under hydrogen detonation. NKS Nordisk Kärnsäkerhetsforskning, NKS, no. NKS-26.

Reinforced concrete wall under hydrogen detonation. / Saarenheimo, Arja.

2000. 50 p. (NKS Nordisk Kärnsäkerhetsforskning, NKS; No. NKS-26).

Research output: Book/ReportReport

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AB - The structural integrity of a reinforced concrete wall in the BWR reactor building under hydrogen detonation conditions has been analysed. Of particular interest is whether the containment integrity can be jeopardised by an external hydrogen detonation. The load carrying capacity of a reinforced concrete wall was studied. The detonation pressure loads were estimated with computerised hand calculations assuming a direct initiation of detonation and applying the strong explosion theory. The results can be considered as rough and conservative estimates for the first shock pressure impact induced by a reflecting detonation wave. Structural integrity may be endangered due to slow pressurisation or dynamic impulse loads associated with local detonations. The static pressure following the passage of a shock front may be relatively high, thus this static or slowly decreasing pressure after a detonation may damage the structure severely. The mitigating effects of the opening of a door on pressure history and structural response were also studied. The non-linear behaviour of the wall was studied under detonations corresponding a detonable hydrogen mass of 0.5 kg and 1.428 kg. Non-linear finite element analyses of the reinforced concrete structure were carried out by the ABAQUS/Explicit program. The reinforcement and its non-linear material behaviour and the tensile cracking of concrete were modelled. Reinforcement was defined as layers of uniformly spaced reinforcing bars in shell elements. In these studies the surrounding structures of the non-linearly modelled reinforced concrete wall were modelled using idealised boundary conditions. Especially concrete cracking and yielding of the reinforcement was monitored during the numerical simulation.

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Saarenheimo A. Reinforced concrete wall under hydrogen detonation. 2000. 50 p. (NKS Nordisk Kärnsäkerhetsforskning, NKS; No. NKS-26).