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 Original design of Units 3 and 4 of Kozloduy NPP provides three-channel structure of the AC and DC emergency power supply, with channel capacity 3x100% and complete separation between the channels. Each channel consists of diesel-generator, diesel-generator battery, 6 and 0.4 kV AC uninterruptible power units with transformers between them, rectifier, inventers, battery and DC power board. Each channel is physically separated and independent, as additional measures for protection against external and internal hazards have been provided. 1.2.2.4.4 Alternative options for the batteries recharging There is mutual redundancy and recharging between the batteries of the diesel-generators and safety systems. Additional links have been created to allow redundancy and recharging of the batteries UPSS-І from all uninterruptible power supply sections - І category or from uninterruptible power supply sections - ІІ category. The unit batteries from uninterruptible power supply sections - І category and batteries in diesel-generator station-2 have the same capacity that allows for mutual redundancy in an emergency situation. 1.3 MAIN DATA ON UNITS 5 AND 6 1.3.1 Main data of Units 5 and 6 1.3.1.1 Reactor Type Each unit has installed power of 1000 MWe and includes the reactor installation with VVER-1000/В-320 reactor, the turbine-generator installation with К-1000/60-1500-2 turbine and ТВВ-1000-4У3 electrical generator. VVER-1000/V-320 is a heterogeneous thermal neutrons water-water energy reactor, of the vessel type. Demineralised water with diluted boric acid in it is used as the coolant and the moderator in the primary circuit, with concentration of the boric acid changing during operation. The reactor core (fuel system) includes 163 fuel assemblies, each consisting of 312 fuel elements. The primary pressure is 15. 7 МРа, reactor inlet water temperature is 288°С. Low enrichment uranium dioxide is used as a fuel with enrichment of 4.4 % 235 U concentration. The primary coolant is heated at passing through the core. After that it is delivered to the steam generators where heat is transferred to the secondary circuit. 1.3.1.2 Thermal power 25/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests Some of the main characteristics of Units 5 and 6 are provided in table 1.3-1: Table 1.3-1: Main data of Units 5 and 6. CHARACTERISTICS VALUE Reactor thermal power Unit electric power - 3000 MW - 1000 MW Unit efficiency factor (gross) - 34,17 % Primary circuit pressure Secondary circuit pressure (MSH) - 15.7 MPa - 6.27 MPa 1.3.1.3 First criticality date. Table 1.3-2: Historical data for Units 5 and 6. DESCRIPTION UNIT 5 UNIT 6 Commencement of constriction 09.07.1980 01.04.1982 Physical start-up – the first criticality 05.11.1987 29.05.1991 Reaching 100% power 21.06.1988 13.08.1992 Acceptance to operation 23.12.1988 30.12.1993 1.3.1.4 Fuel Storage Pond The fuel storage pool (SFP) serves for storage of spent fuel (until the residual heat reaches permissible level). The capacity of the SFP is 612 FAs and it ensures storage of the spent FAs for at least three years (section 9 of [7],[8]). It is provided with tight fuel storage and consists of 4 parts – three sections designed directly for storage of spent fuel assemblies and universal slot for fresh and spent fuel handling. The universal slot is used for both transport container for spent fuel and containers with fresh fuel and with hermetic casks. The transport containers loading zone is separated from the spent fuel assemblies storage zone, so that in case of dropping a container, fuel elements are not damaged or the boron solution level over the assemblies is not reduced. The fencing structures of SFP are designed to retain cooling boron solution (that may contain radioactive products) as well as to mitigate ionizing irradiation. They present reinforced concrete walls with double metal hermetic lining with potential leak control drainages. 1.3.2 Systems Ensuring or Supporting the Fundamental Safety Functions In the design of safety related systems and equipment design solutions are used, based on the passive principle of operation. Safe failure principle and inherent self protection properties (selfcontrol, thermal inertia, reactivity feedback and natural coolant circulation) and other natural processes are underlain in the design. 26/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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