The new modular emergency procedure concept for SIEMENS PWRs

The new modular procedure concept which is being implemented in German PWRs meets the increasing requirements on clarity, manageability and human factors optimization while keeping the efforts involved in updating, reproduction and storage on an acceptable level. The concept uses three levels of detail for presenting the required information: strategy chart with automatic and manual action modules, resolution of action modules into individual actions and background information, resolution of individual actions into detailed step programs. The procedures are written with the aid of an electronic publishing software that runs on multiple platforms such as Unix work stations, MS-DOS Pcs and Macintosh computers. To facilitate the generation of new procedures the action modules will be stored in a relational databank containing all relevant plant specific information. Verification of thermalhydraulic plant behaviour is done by computer simulation at the time of development. Use of the plant analyzer developed by SIEMENS is envisaged. Final man-machine interface validation is done by full scope simulators during training sessions of reactor operators. Future development will be directed to combine the event-oriented and the safety-function oriented approaches to a fully harmonized concept and to integrate the new modular procedures format into the computerized control room of the cockpit type being developed by SIEMENS. (author). 3 refs, 4 figs