Specific questions were asked about PPC subsystem verification by vendors and whether the information could be shared. There were 1300 time dependences in the modules of which 120 needed remediation. It was noted that this is consistent with western experience. The code was not tested until after the remediation had been completed. There is not much source code available at the plants.
Most source code resides at the vendors.
In general, the PPCs are monitoring tools, not control mechanisms. However, there are other computer systems that have control functions and which could have Y2K vulnerabilities. In general, operations without network and computer systems would be unlikely. For example, the Kurchatov Institute holds the code and tools required for some of the modules on WWER-1000 PPCs. For other plants it was indicated that a majority of the source code is held and can be used, but there is no time available for a complete code review.