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Tham khảo tài liệu 'nuclear power system simulations and operation part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 94 Nuclear Power - System Simulations and Operation Preparing the qualification matrix. Executing assessment calculations. Performing comparison and final evaluation. Configuration Period Distinctive features Remarks I st configuration 1983-1995 Old Steam Generators Difficulties in data recording Large number of unexpected transients 2nd configuration 1995-1999 New Steam Generators New Feed Water Control System New value of average temperature Few unexpected transients Complete set of start-up tests 3rd configuration 1999-2002 Approximately 8 power up-rating Very few unexpected transients Selected start-up tests 4th configuration 2002 - today Approximately 1 power up-rating Very few unexpected transients Limited number of start-up tests Table 1. Ascó configurations The qualification matrix is prepared by establishing a list of plant transients suitable for qualification and another list of systems and components needed for advanced qualification. The first list is prepared in a comprehensive way. Some decisions can be made in order to obtain a good level of qualification with reasonable effort. Some configuration can be interesting due to the number of unexpected transients but the engineering effort to maintain the corresponding model could be excessive. In this case it is better to discard the configuration provided that there are sufficient recorded transients in the rest of the configurations. The second list has to be prepared to identify which systems and components have had a significant effect on the transients analysed to date or intended to be analysed in a near future. Following what has been established in the previous section this includes a complete set of calculations related to PSA and others to EOP analysis. Once both lists were ready the information was organized as can be seen in Figures 5 and 6. The former is the qualification matrix and the latter shows a detailed part of it. Each transient is set to a column i and each system or component to a
