Tham khảo tài liệu 'nuclear power deployment operation and sustainability part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Long-Term Operation of VVER Power Plants 165 Czech Report 2010 . The same achievements are published for other VVER plants in the national reports compiled under Safety Convention see Slovak Report 2010 . The CDF for Bochunice V-2 NPP is shown in Fig. 5. Development of Level 1 PSA results for NPP Bohunice V-2 Fig. 5. Decreasing the CDF for Bochunice V-2 NPP due to the implementation of safety upgrading measures Slovak Report 2010 Similar to Slovak and Czech plants results have been achieved at Paks NPP in Hungary too. Extensive modernisation and safety upgrading programme has been implemented in Ukraine Ukraine 2011 and Russia Rosenergoatom 2003 and Bulgaria Popov 2007 too. One of the issues related to the justification of the compliance with current licensing basis at VVERs operated outside of Russia is the lack of the knowledge of design basis especially the assumptions made by the designer with respect to the ageing mechanisms stressors and time limits of the safe operation of the components. The availability of design base information is a current licensing basis requirement. In the same time knowledge of design base is unavoidable for the preparation of long-term operation and licence renewal especially for the review of time-limited ageing analyses. Operators of WWER-440 213 units have to perform specific project for the design base reconstitution. The design base reconstitution covers the identification of design base functions values and bounding conditions according to the licensing basis. Two basic tasks have to be performed while reconstituting the design base - collection and review the original design information - consideration of the changes of the licensing basis since the design and issuance of the operational licence. The design of VVER-440 213 and the older VVER-1000 plants was generally based on the former USSR regulations of early the seventies 166 Nuclear Power - Deployment Operation and Sustainability - General Requirements on Safety of NPP .
