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 · Spray pools; · The walls of the advance chambers of CPS -3,4. (The seismic category of the advance chamber of CPS is given in relation with the safety of units 3 and 4 existing at the time.) · Cooling water channels in the Power Generation 2 area. (The seismic qualification is performed for the advance chambers and bridge fences at A=922.00 and at A=1108.00.) · Cable channels between DGS and reactor building. 2.5.1.2 SSEL systems and components In the framework of Modernization Programme of Units 5 and 6 [67] safety related equipment qualification was performed. The verification of the qualification procedure for compliance with international requirements, item 3.2.1.1 [7], [8] was performed as well as equipment qualification status was verified and the following was developed [71]: · SSSL (Safe Shutdown Systems List); · SSEL (Safe Shutdown Equipment List); · HECL – Harsh Environment Component List. At a later stage after completion of analysis of the current state of Units 5 and 6 equipment qualification as part of activities under contract of Kozloduy NPP and VNIAES – Moscow these lists were reconsidered and updated. The final list of equipment that has not been qualified was developed [72]. Currently seismic qualification of Units 5 and 6 remaining equipment not qualified for seismic impacts is underway by replacement or by a combination of expertise (including analogy) and analytical methods. The process of seismic qualification in the plant continues systematically, including supply of new equipment, maintenance and modernizations. The qualified equipment list SSEL (Safety Shutdown Equipment List) is maintained updated [68]. 2.5.1.2.1.1 Safety systems The design classification of the systems of Units 5 and 6 is performed according to [48] (similar to [49]). In the framework of Modernization Programme of Units 5 and 6 (and in accordance with IAEA regulations) classification of the systems and components in terms of safety, seismicity and quality was performed according to current normative documents, item 3.2 [7],[8]. The safety classification is performed according to [50] as the main document, using the functions from [51] for confirmation, item 3.2.1.1 [7], [8]. The seismic classification has been performed based on the guidance of [41] with account of [52]. The safety systems classification is provided in table 3.2.1 [7], [8]. Seismic qualification and operability of the following systems was confirmed: · High pressure emergency boron injection system; 71/202
“Kozloduy NPP” PLC SUMMARY REPORT for Conduct of Kozloduy NPP Stress Tests · Medium pressure emergency boron injection system; · Emergency and normal core cooldown system; · Passive emergency core cooldown system; · Primary circuit overpressure protection; · Secondary circuit overpressure protection; · Primary circuit emergency gas removal system; · SG emergency makeup water supply system; · Containment; · Spray system; · Pressure reduction filtering system; · Hydrogen concentration control and reduction system; · Essential components service water supply system; · Supporting ventilation systems; 2.5.1.2.1.2 Reactor The systems and components classification is performed in the framework of modernization of Units 5 and 6 of Kozloduy NPP. The reactor and the internals has been originally designed considering seismic impact of 9 points by MSK-64 scale, item 3.13.4 [7],[8], item 6.3.3 [67]. According to item 6.3.3 [67] these requirements are specified in the Terms of Reference (ToR) and confirmed. Item 4.7 [7],[8] summarizes the actions performed for the reactor modernization with regard to the Modernization Programme of Units 5 and 6. The equipment seismic qualification has been reviewed in the framework of the modernization programme [7],[8] and [67]. 2.5.1.2.1.3 Reactor building major equipment The major equipment in the reactor building has been designed considering the seismic impact loads from 9 points by MSK-643 scale [7] and [8]. Item 5.5 [7],[8] summarizes the actions completed for modernization of the primary circuit and related systems with regard to the modernization programme of Units 5 and 6. Under the modernization programme analysis of the behaviour and calculation of the seismic resistance of the major equipment and the safety systems equipment was performed and proposals developed for required reinforcements, item 6.3.3 [67], item 3.13.4 [7],[8]. The seismic qualification of the pipelines, equipment and fixing elements of the primary circuit has been reviewed in a number of measures under the modernization programme with the results are summarized considering the new seismic requirements for the site. Qualification of the following primary circuit equipment was confirmed: · Main circulation lines; · Steam generators; · Reactor coolant pumps. 72/202
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Summary Report for Conduct of Kozloduy NPP Stress Tests

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