Execution period 2005 - 2007
Contractor Kozloduy NPP Plc.

ANALYSIS OF THE POSSIBILITIES FOR CONTAINMENT BYPASS

The task has been accomplished in the framework of Measure 24241 of the Modernization Program of Kozloduy NPP Units 5 and 6.

The services of that project are as follows:

  • Development of the methodology;
  • Analyses of the boundary conditions for all the IE (Initiating Event)  groups listed in the "Design accidents IE list" with influence on the containment construction;
  • Analysis of the reliability of the containment structures for ultimate stress estimation:
  • Overall performance of the containment in Beyond Design Basis Accident (BDBA) scenarios using simultaneously maximum load of pressure and temperature;
  • Individual assessment of the number of the mechanical equipment, located on containment boundary;
  • Sensitivity analysis (for operator action sensitivity – to the end-state condition).

For the analysis of the technical condition of the containment the following codes were used: SOLVIA (main calculation), NISA (transient temperature calculation) and FEMAP (universal pre-processor).

The technical condition of components was analyzed with the following codes: ALGOR FEA and PIPE PLUS. The model preprocessor “SUPER DRAW 3D” and ALGOR FEA.

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