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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