This is NKS NKS-R NKS-B News Seminars NKS Reports Phantom Library

You are here: Homepage NKS Reports View document
List all reports List all NKS-R reports List all NKS-B reports Search Reports  
NKS Programme Area:NKS-R
Research Area:Severe accidents and Reactor Physics
Report Number:NKS-73
Report Title:Structural integrity of a reinforced concrete structure and a pipe outlet under hydrogen detonation conditions
Activity Acronym:SOS-2.3
Authors:Arja Saarenheimo, Ari Silde, Kim Calonius
Abstract:Structural integrity of a reinforced concrete wall and a pipe penetration under detonation conditions in a selected reactor building room of Olkiluoto BWR were studied. Hydrogen leakage from the pressurised containment to the surrounding reactor building is possible during a severe accident. Leaked hydrogen tends to accumulate in the reactor building rooms where the leak is located leading to a stable stratification and locally very high hydrogen concentration. If ignited, a possibility to flame acceleration and detonation cannot be ruled out. The structure may survive the peak detonation transient because the eigenperiod of the structure is considerably longer than the duration of the peak detonation. However, the relatively slowly decreasing static type pressure after a peak detonation damages the wall more severely. Elastic deformations in reinforcement are recoverable and cracks in these areas will close after the pressure decrease. But there will be remarkable compression crushing and the static type slowly decreasing over pressure clearly exceeds the loading capacity of the wall. Structural integrity of a pipe outlet was considered also under detonation conditions. The effect of drag forces was taken into account. Damping and strain rate dependence of yield strength were not taken into consideration. The boundary condition at the end of the pipe line model was varied in order to find out the effect of the stiffness of the pipeline outside the calculation model. The calculation model where the lower pipe end is free to move axially, is conservative from the pipe penetration integrity point of view. Even in this conservative study, the highest peak value for the maximum plastic deformation is 3.5%. This is well below the success criteria found in literature.
Publication date:01 May 2002
ISBN:ISBN: 87-7893-129-0
Number of downloads:6714
Download:pdf NKS-73.pdf
Contact NKS   NKS Sekretariatet
Boks 49
DK-4000 Roskilde		   Telephone +45 46 77 40 41
E-mail: nks@nks.org 		  

Address for visitors
Directions and map

Privacy policy

Cookie policy

 

Alphabetical index  |  Sitemap  |  Extranet Login

Website last modified: 19 November 2024