"This standard establishes application criteria for programmable digital computer systems used in safety systems for nuclear power generating stations by expanding the quality and equipment qualification requirements of IEEE Std 603-1980@ ""Standard Criteria for Safety Systems for Nuclear Power Generating Stations@""' to encompass software design@ software implementation@ and computer system validation. Figure 1 illustrates the interrelationships among the various processes in the application of programmable digital computer systems in safety systems for nuclear power generating stations. This standard does not consider site installation@ site testing@ or maintenance of the computer system."