Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
2.4.1.2 SSEL systems and components
The original deign classification of the systems of units 3 and 4 has been completed in
accordance with [48] and [49].
Later the systems and components have been classified in accordance with current
normative documents. The procedure for qualification is verified according to the international
requirements and the systems and equipment have been requalified as follows:
· Safety classification is performed according to [47] as the main document, and also
functions from [50] and [51] were used.
· Seismic classification is performed based on the IAEA guideline [41] considering
[52].
The qualification is performed for components included in the safe shutdown equipment list
and used for SNF safe storage in the in the SFP. Seismic qualification and operability of the
following equipment ensuring spent nuclear fuel safe storage in the SFP has been confirmed.
Seismic category 1:
· Reactor (core, reactor internals), reactor vessel and lid;
· Fuel storage pool;
· Primary circuit main circulation lines and Reactor coolant pumps;
· Steam generators;
· Pressurizer primary circuit pressure maintaining system;
· Thermal-physical and neutron-physical parameters – neutron flux monitoring
equipment;
· SFP cooldown system;
· Makeup water system;
· Main steam lines system (main steam header);
· Emergency makeup water system;
· SFP flooding system;
· Core flooding system;
· Steam generator compartment pressure reduction system - Spray system;
· Uninterruptible power supply system, category 1 and 2;
· Automatic seismic protection system ;
· Triggered load system (for the diesel generators loading);
· Containment system;
· Containment pressure reduction system;
· Essential components service water supply system;
· Fire alarm and protection system;
· Additional system for SG emergency makeup Units 3 and 4.
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