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 trucks, flatbed machines), an engineering equipment - 8 machines (Fadroma, bulldozers) and 15 special vehicles (cranes, tractors and tanks). Freight transport and specialized material handling equipment is owned by the Kozloduy NPP and includes 32 vehicles located at the site of Units 5 and 6. The emergency plan of Autotransport department includes snow clearing and sanding the road surface of the NPP during the winter period. The activity of the Autotransport department during an emergency is coordinated by the Shift Supervisor of the nuclear power unit till the establishment of emergency structures, and after its establishment it is coordinated by Head of Support Services of the Management Team. Emergency inventories according to the technical specifications According to technical specifications of the nuclear facilities the necessary emergency inventories of boric acid, reagents, agents for chemical and radio chemical laboratories, boric solutions and demineralized water in tank compartment SK2, SK3 and shop for chemical water traetment is maintained to bring them in safe condition. The emergency plan of Kozloduy NPP [28] provides for measures relating to the management of nuclear facilities during and after the earthquake, with a focus on anticipation and prevention in the sequence of action. At KNPP site the necessary infrastructure to respond to seismic events has been designed and built. 2.9.5 General process to ensure the availability and preparedness of external mobile equipment and supplies provided in the emergency plans after the earthquake (natural disasters) External forces and resources to be involved to support KNPP are specified in the National Emergency Plan for carrying out rescue and emergency repair work in case of disasters, emergencies and accidents [75]. State authorities maintain a reserve of funds for decontamination, food, clothing and fuel for the needs of application of the external emergency plan. A system has been established for liaison with the national emergency services and the inclusion of emergency operations in the National Emergency Plan [75]. Providing fire and emergency rescue activities on the site of Kozloduy NPP and the area of preventive measures is ensured with forces and resources of the Regional Service for fire safety and protection of the population - KNPP and the Regional Service for fire safety and protection of the population - Kozloduy. According to the National Emergency Plan the General Directorate for Fire Safety and Protection of Population of the Ministry of Internal Affairs established a reserve of forces and means for introducing them as necessary in the area of emergency and precautionary measures. When introducing the National Emergency Plan the National Headquarters for control and coordination under the Council of Ministers chaired by Prime Minister of Bulgaria or Minister of Internal Affairs and the Supreme Council to the National Emergency Plan for protection against 91/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests disaster and emergency convene. Under the National Headquarters for control and coordination Expert Council is formed with member experts from various ministries and departments, which defines and coordinates the actions for the supply of necessary raw materials and equipment. At a distance of 80 km from the plant site the training base of Bulgaria and the training center for lifeguards at General Directorage for fire safety and protection of the population is located. The center is certified by NATO and the European Commission and has heavy engineering equipment, mobile laboratories, crews for response for 24 hour duty service. 2.9.6 Potential deviations from the licensing base, actions and measures for their elimination Kozloduy NPP meets the requirements, standards and rules on nuclear safety, radiation protection and physical protection when carrying out activities under the license. No non-conformities with the licensing base for any of the nuclear installation were identified and the recommendations made result from conservative analyses with combination of the most adverse operational states and with the analysis of cliff edge effects. 2.10 ASSESSMENT OF SAFETY MARGINS AGAINS EARTHQUAKE The margins reassessment should define the boundary capacity of the nuclear facility, i.e. to determine the values of the accelerations at which refusals of the SSCs will compromise the performance of safety functions and damage to the fuel will be inevitable [2], [3]. 2.10.1 Description of methods for margins assessment The equipment which is important for safety and is involved in accident sequences was analyzed for seismic resistance defined as parameters of functions describing the conventional probability of its failure (fragility curves). For the purposes of the safety margins reassessment review of the parameters of the functions of conventional probability for the destruction of individual SSCs obtained in [34] and [36] is conducted. The curves of the conventional probability of failure of components (element of building structure, equipment or a separate element of the facility) is defined by its probability of failure at different values of the reference parameter of the seismic response. The purpose of the seismic vulnerability analysis is to determine the value of the peak ground acceleration where seismically induced efforts in the component under consideration located at a given point of the ciivl structure will exceed its capacity. Assessment of this acceleration value is done using the data for the design stage and reassessment of the seismic analysis, taking into account the dynamic response of the components, the actual spatial dimensions of structures and properties of materials. The analysis consists in the consistent review of all ranges of seismic effects, for each range safety related SSCs that fail being presented. Changes in the behavior of nuclear facilities (the 92/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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