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 Another source for Danube River level monitoring are the daily reports received electronically from the Agency for exploration and maintenance of the Danube River in the town of Ruse. 3.2.3.1.4 Underground waters monitoring Kozloduy NPP site region underground water level monitoring is performed the so-called piezometers specially built for tube wells. All piezometers are benchmarked and related with Kozloduy NPP coordinate system. Through monthly monitoring of the location of piezometric line indirect monitoring of condition of the lining and the joints of dual channel, spray pools, underground water lines is also performed. 3.2.3.2 Emergency procedures The actions at flooding or accidents caused by flooding are specified in the following documents of Kozloduy NPP: · Emergency plan of Kozloduy NPP, [28]; · Emergency action plan for accident situations by the existing ХТС for Kozloduy NPP service water supply, [127]; · Instruction for operation, monitoring and control of ХТС buildings for Kozloduy NPP service water supply, [131]; · Instruction for starting of announciation process by Kozloduy NPP announciation system, [132]; · Action plan of “Autotransport” department at emergency situation in Kozloduy NPP, [133]; · Plan for medical support at accident in Kozloduy NPP; · External emergency plant of Kozloduy NPP [75]. 3.2.4 Potential impact from outside the plant, including prevention or blocking of personnel and equipment access to the site 3.2.4.1 Potential impacts on the adjacent facilities in the lowland at MWL The lowland is divided from the hydro-technical channels of Kozloduy NPP into three zones. The most western zone is limited to the east from hot channel-2, to the south from Kozloduy NPP and to the west reaches and enters the town of Kozloduy. The medium zone is limited from hot channel-2, Kozloduy NPP and the dual channel. The eastern zone is limited from the dual channel and the bed of Ogosta River. Below the flooding of the lowland situated between Kozloduy NPP site and Danube River is considered separately for the three different zones in order to demonstrate indirect impact of such flooding that may influence on the plant operation. 113/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests 3.2.4.1.1 Potential impacts at flooding of the lowland at break of the dike in the area between hot channel-2 and BPS At break of the national dike first shaft pump stations located in the immediate vicinity of the national dike will be flooded and hindered as sources of supplemental water for spray pools of Units 5 and 6. Access to the bank pump station by land is most likely to be lost. This will happen during the first hours following the break of the state dike because the drain channels and roads to the bank pump station are at lower elevation and will be quickly flooded. At flooding of the lowland and filling to elevation 32.00 meters also destruction of part of the columns of power lines on the way of the tidal wave can be anticipated. The emergency pipelines of the emergency pump station of bank pump station to the emergency capacity are steel and placed in the pit, but when crossing the drain channels are open and bridging them. These open areas are vulnerable and can be damaged by tidal wave. In the valley formed by the hot channel-2, cold channel-1 and the Danube embankment all the sewage from the site of Units 1 to 4 and from the reactor compartment, diesel generator stations and the Turbine Hall of the site of Units 5 and 6 are drained. The rest of the sewage of the site of Units 5 and 6 will also retain water because water will pass over the siphons of low pressure channels and under hot channel-2 in outfalls for sewage and rain water. This can create conditions of water return by sewage collectors for domestic and rain water sewers, passing by spray pools and filling to the elevation of plain flooding. It is possible for sewage pits the site to be filled with water to el. 32,93 m. The availability of treatment plant for domestic waters for the site of Units 5 and 6 does not prevent the entry of water in domestic sewage system as it is possible that water passes through shaft 537, which serves as an overflow at excess capacity of the treatment plant. In the town of Kozloduy the vicinity of the mill and a part of Lom highway will be flooded. The access from the town of Kozloduy to the site will be possible in the ring highway and pass point Kharlets. To the west the water will reach the town part to the north of hotel “Istar”, will flood the buildings of ECR, the treatment plant, settlements. 3.2.4.1.2 Potential impacts at flooding of the lowland at break of the dike in the area between the town of Kozloduy and hot channel-2 At flooding of the valley of this area the end result will be almost the same as described in item 3.2.4.1.1. The difference will be that only part of the columns will take the initial impact of the tidal wave as the others are protected by hot channel-2. 3.2.4.1.3 Potential impacts at flooding of the valley at break of the dike in the zone between BPS and Ogosta River In flooding of the valley from this area power lines Harlets, Neutron and Danube will be affected the most. In the area there are no other facilities related to the operation of Kozloduy NPP besides the open stores. Under certain conditions the formation of the initial tidal wave the dike of warm-channel-1 may be eroded and destroyed. Ingress of water to the area of the valley between 114/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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