Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
3.2.4.4 Possibility of intervention of support and external services to support the plant
operation
From what was said above, it follows that the postulated flooding of the area around the
plant with MWL has no impact on road infrastructure within its area, as well as of the road access to
it. In this situation one can rely on full support from the outside, including access of machines,
supply of equipment and materials on the site. There is neither restrictions in personnel access, nor
time delayed in access of these personnel to the plant.
For performance of fire fighting and rescue activities in the area of Kozloduy NPP
continuous day and night shifts with personnel and equipment from Regional Authority for Fire
Safety and Personnel Protection -Kozloduy NPP is provided. Regional Fire Service is located
immediately on Kozloduy NPP site. For fire fighting, participation in mitigation of disasters,
accidents headquarters for management of fire fighting and rescue activities is formed. In case of
occurrence of fire or loss of makeup water for automatic fire fighting system the necessary
personnel and equipment can be immediately provided from the fire service to ensure normal
operation of the plant.
3.3 PLANT COMPLIANCE WITH THE CURRENT LICENSING
CONDITIONS
The overall process for ensuring the SSCs required for safe maintaining of the units in
shutdown, ensuring the availability and preparedness of external equipment and supplies provided
in emergency plans after the flood does not differ from the one those described in paragraph 2.10 of
this report.
3.4 EVALUATION OF SAFETY MARGINS AGAINST EXTERNAL
FLOODINGS
3.4.1 Definition of safety margins against external floodings
3.4.1.1 Description of the approach
Based on the inspections carried out in the plant area the assumption that flooding of
Kozloduy NPP separate facilities is possible due to weaknesses in the sewerage network was
confirmed – it is possible that water returns in sewer collectors for domestic and rainwater sewers
and fills the spaces to the elevation of the plain flooding. Thus, in all buildings where the lowest
elevation of rainwater or domestic sewer is below 32.93 water penetration from outside becomes
possible. Physical flooding of the given room depends on the presence of drains, manholes or
damages below elevation 32,93 m.
The assessment of the plant margins at external flooding is based on individual margins of
all buildings and facilities directly related to the safety of the plant. The margin of a building is
determined by the lowest location where flooding of a room in the building can theoretically occur
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