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 1.5.2.3 Emergency power supply Emergency power supply is ensured from uninterruptible power supply system (UPS) with backup batteries for the 1 st category equipment, such as data recorders, core monitoring and alarm devices, etc. to ensure safe evacuation of the building after loss of normal power supply. These systems are mounted in place and have discharge time from 10 minutes, which is sufficient to start the backup power supply. 53/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests 1.6 GENERAL PLANT FACILITIES AND STRUCTURES 1.6.1 Outdoor switchyard (OSY) The outdoor switchyard (OSY) of Kozloduy NPP has two main purposes, namely distribution of the electric power generated by the units and providing for NPP auxiliaries, including power supply to the bank pump stations. 1.6.1.1 The site location and specific features The outdoor switchyard is located on Kozloduy NPP site. Its 110 KV part was commissioned before the construction and erection of Unit 1, and the whole construction of OSY has been implemented in three stages – for connection unit1 and 2, units 3 and 4 and units 5 and 6. 1.6.1.2 Connections of the plant to the electric energy system (EES) Kozloduy NPP has been connected to the electric energy system (EES) of Bulgaria via three own switchyards (OSY) of voltage 400 kV, 220 kV and 110 kV, with the transmission lines outgoing from the plant as follows: · Eight transit transmission lines 400 kV, of which 2 are between the lines to the EES system in Romania and 6 lines to substations within the country; · five transmission lines 220 kV, from which 3 transit lines to substations in the country and 2 radial lines to bank pump station (BPS); · four transmission lines 110 kV, from which 2 transit lines to substations in the country and 2 radial lines to substations in the country. The total number of the transmission lines to which Kozloduy NPP is connected is 17, among which 13 are transit and 4 are radial. The connection between OSY 400 kV and OSY 220 kV also between OSY 220 kV and OSY 110 kV are realize through autotransformers. Figure 1.6-1 presents a switchyard, showing all the conclusions and accessions. The following Figure 1.6-2 shows a detailed circuit diagram of the switchyard-400KV, related to power units 5 and 6. The diagram clearly shows the triple redundancy power stations own needs. It is also shown and the connection of mobile diesel generators. 54/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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