Outage management strategy at Olkiluoto 1 and 2, Finland. Appendix I

TVO has an activity based management system approved by the Finnish regulatory body (the Radiation and Nuclear Safety Authority (STUK)). The system fulfils the requirements of Quality System Standard ISO 9001: 2000 and is certified by an accredited body (DNV Certification OY/AB). The main objectives of outage management at TVO are to: Restore plant quality and performance; Ensure shutdown safety; Improve future performance; Implement plant modifications; Minimize conventional and radiological hazards; Minimize waste generation: Minimize outage scope; Optimize outage duration. In order to meet the above objectives, TVO has an effective outage management system, consisting of strategy, outage planning: outage execution and post-outage review. The technical specifications can be seen as a set of operational safety rules and criteria, which define the allowed operational range from the safety point of view. The content of the technical specifications for OL1 and OL2 was changed in 1986, when a separate chapter (Conditions and Limitations for Cold Shutdown and Refuelling Outage) was written. If exemptions from the rules given in the technical specifications are necessary to carry out some tasks in a practical manner, then the safety office of the utility prepares an application for an exemption. The on-site safety committee handles all applications for exemptions before submittal to the regulatory body. According to the regulatory guide for nuclear power plant outages, the utility has to submit for approval or information a large number of documents to STUK well in advance of the outage. During thc outage. there are up to ten inspectors Prom STUK at the plant site. Although the supervision of outage activities carried out by STUK is relatively extensive, the regulatory activities do not normally cause any significant delays in the progress of outage activities