Summary Report for Conduct of Kozloduy NPP Stress Tests

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“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests Figure 1.3-3: SFP for Units 5 and 6 Spend Fuel Tank Spray Pools From Spray Pumps Discharge Line Spend Fuel Cooling Heat Exchanger Service Water Pump Spray Pools Spend Fuel Cooling Pump Spend Fuel Cooling Heat Exchanger Service Water Pump Spend Fuel Cooling Pump Spend Fuel Cooling Heat Exchanger Service Water Pumps Spend Fuel Cooling Pump Service Water Pump Artesian Well Pumps 37/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests 1.3.2.3.3 Availability of heat removal logics and measures to extend the systems operability The pumps, heat exchangers and the equipment of each channel of the SFP cooling system are located in a separate room, which provides physical separation and impossibility of simultaneous common cause failure of two or more channels. Each system is able to perform its functions with account of single failure. 1.3.2.3.4 Heat removal systems AC and DC power supply Electric power supply to the active components for each train of the safety systems for SFP cooling is ensured for uninterruptible power supply І and ІІ category is from respective train of the system for І and ІІ categories uninterruptible power supply. 1.3.2.3.5 Alternative logics and equipment cooling In emergency modes with containment isolation removal of the residual heat from the fuel stored can be provided in two ways: by pool water evaporation and by supply of water to the spray system pool. In emergency modes with containment isolation isolating valves of the head and suction pipelines of SFP cooling system close and the system does not operate. The head pipelines of the system are connected with the spray system head pipelines, while the valves located on these lines are always closed. At containment pressure increase (when the isolation valves are closed) locking of opening of these valves is automatically removed and cooling of the SFP is provided through water supply the spray pumps head and the water overflow to the EMT. This can be achieved before the pool water evaporation. In this case, to prevent from unacceptable reduction of fuel compartment level and uncovering of the fuel, emergency makeup from spray system is also used. 1.3.2.4 Heat removal from containment area to the ultimate heat sink 1.3.2.4.1 Heat removal logics from the containment area to the main ultimate heat sink In normal operation mode heat removal from containment system is performed through ventilation systems for containment system cooling, whose air-coolers are cooled from essential components service water supply system. At accidents associated with containment system pressure increase heat is removed by spray system and then to the channels of essential components service water supply system. 1.3.2.4.2 Heat removal systems Spray System. The system is designed to localize accidents through condensation of the evaporated part of the coolant released from the containment. The system also performs the following functions: 38/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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