Execution period 2004 - 2005
Contractor Kozloduy NPP Plc.


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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