National Report of The Slovak Republic , september 2001


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2.1.3 NPP V-1 units safety improvement programs


Safety improvement programme, so-called „small reconstruction“ was implemented on both units within 1991-1993; based on 81 requirements of the Resolution No. 5/91 and 14 requirements of the Resolution No. 213/92 of the former ČSKAE.

Based on the amended safety analysis report for NPP V-1 (1993) drafted on the „gradual upgrading“, ÚJD by its decisions No. 1/1994 and 110/1994 set areas and procedures for the adoption and implementation of measures enabling further operation of NPP V-1 units, the programme of the so-called „Gradual Upgrading“ implemented within 1994 through 2000. The NPP V-1 units safety improvement programme was based on both probabilistic and deterministic objectives:

  • probabilistic goals:
    • probability of safety systems failure must be below 10-3 on demand
    • probability of reactor core damage must be below 10-4/year
    • probability of reactor protection system failure must be below 10-5on demand
  • deterministic goals:
    • coping with the maximum design basis accident (LOCA 2 x F 200 mm) with the conservative approach and coping with beyond design basis accident (LOCA 2 x F 500 mm) with the best estimate approach,
    • to achieve such a tightness of containment, which ensure dose equivalents from will not be exceeded upon design basis accident and beyond design basis accidents,
    • to achieve seismic resistance of the installation of 8o MSK-64

The following section describes the process of the preparation and implementation of the „V-1 Units Gradual Upgrading“ programme.


2.1.3.1 Project development stage
2.1.3.2 Implementation of the Gradual Upgrading Project

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