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Mass/Energy Release Influence to Thermal Hydraulics of Accident Localisation System at Ignalina NPP in Case of MDBA

[+] Author Affiliations
E. Urbonavicius, S. Rimkevicius

Lithuanian Energy Institute, Kaunas, Lithuania

Paper No. ICONE10-22474, pp. 793-799; 7 pages
  • 10th International Conference on Nuclear Engineering
  • 10th International Conference on Nuclear Engineering, Volume 4
  • Arlington, Virginia, USA, April 14–18, 2002
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-3598-7 | eISBN: 0-7918-3589-8
  • Copyright © 2002 by ASME


The maximal loads on ALS structures could be reached during Maximum Design Basis Accident (MDBA). MDBA for Ignalina NPP is defined as guillotine rupture of the pressure header of main circulation pumps (MCP). In this paper the influence of calculated mass and energy release in case of MCP pressure header rupture on behavior of thermal hydraulic parameters in ALS compartments is presented. The performed analysis demonstrated the importance of mass/energy release for the calculated highest pressure in ALS. Nevertheless, the maximal calculated pressures in ALS compartments are below the design pressures even in case of most conservative mass/energy release through the break.

Copyright © 2002 by ASME



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