Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
· Turbine hall and electric building fire alarm and fire extinguishing systems;
· Auxiliary building-3 fire alarm and fire extinguishing systems.
2.5.3.4.3 Measures for protection against explosions
According to the analysis [87] in the report assessment of the safety impact and proposals
are made for organizational measures to prevent from and to reduce the consequences of explosion
on petrol station owned by Kozloduy NPP located in the area of Garage No. 2: the total amount of
petrol in the petrol station shall not exceed three tons.
In pursuance of this recommendation analysis and assessment of the impact from potential
explosion of petrol occurred in the plant owned petrol station on the neighbouring facilities and
structures in the area of Kozloduy NPP have been developed, [88]. The results of the study [88]
demonstrate that at potential explosion of petrol the Nis and safety systems elements will not be
affected.
2.6 PROVISIONS MADE FOR PROTECTION AT RLE OF SFS
2.6.1 Systems, structures and components (SSCs) required for maintaining SFS in safe state
According to the recommendations [3] the stress tests are performed based on the available
and approved by Kozloduy NPP instructions, procedures, technical specifications, SAR, technical
decisions and their substantiations, results of studies and reviews.
Analysis [44] was performed covering all operational states taking into account the most
unfavourable conditions (boundary conditions of operation) according to [26].
To cope with different accident scenarios SSCs (elements) are summarized according to lists
mentioned in item 2.1.1.4. of [85]:
· Emergency DG of SFS;
· Mobile DG;
· Interlocking of the refuelling machine in SFS by industrial seismic protection system
(III and IV unit);
· Level gauges in the rooms at emergency flooding of elevation -7.20m;
· Fire alarm system in SFS;
· Fire tubes drying from elevation 0.00m to the roof of building in SFS;
· Compartments for SNF storage (civil structure, pipelines and valves for leak
control);
· SFS building;
· Bridge crane 160/32/8t (incl. load carrying structures for container handling);
· Crane 16 t (incl. load carrying structures for SNF handling)
· SFS DG building.
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