Advanced Reactor Licensing : Experience with Digital I&C by RT Wood; Oak Ridge National Laboratory. .; United States.

By RT Wood; Oak Ridge National Laboratory. .; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information

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This ensures the integrity of the transfer process from the mainframe computer to the microcomputer. The checksum calculation is repeated throughout the microcomputer operation. The change control and configuration management for the hardware follows corporate drafting standards used for previous generation protection systems. After installation, the executable code that has been burned into programmable read-only memory (PROM) was treated as hardware. The microprocessor printed circuit board is imprinted with a drawing number that defines, among other things, the software configuration.

6 Software Errors United Kingdom Commissioning testing of HICS at the Sizewell B Nuclear Power Station revealed an error in the system software. The software error, which was in the'data network controller, was easy to uncover and reproduce. Under burdened operation, the data buffer management could corrupt the data. The problem occurred at a threshold, so it was easily detected after the threshold was reached. However, the software error was a subtle problem with dynamic data buffers that is not amenable to analysis using formal methods.

For SDS1, the trip computer design requirements and design description consisted of an English overview description and a corresponding mathematical functional description based on a box-structured method. The design description described the 25 interface requirements between hardware and software components. The required software functions contained in the design requirements and design were combined to form the "virtual" trip computer software requirement specifications. For SDS2, the software requirement specifications were written using function tables.

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