Outdated controls & instrumentation in nuclear power plants - strategies for extending useful life

Technological improvements in today´s electronic systems continuously occur. For example, each and every year, computer platforms change significantly in functionality, reliability, and interface needs. In contrast, the Instrumentation and Controls (I&C) used in nuclear plant systems are generally very customized and demand a frozen design with long-term supplier participation in I&C support strategies. And for 20+ year-old plants, eventually such custom systems become more costly to maintain and out-of-sync with today´s technology. As a result, today´s nuclear I&C maintenance departments are faced with outdated electronics, increased failure rates, and tight plant operating budgets - it becomes a constant dilemma to identify solutions and strategies for sustained plant operation. This paper offers some strategies, techniques, and guidelines for obsolescence-proofing through I&C inventory service contracts, spare parts, repairs, and upgrades/mods. In addition, a Control Room Initiative program is discussed to create a framework for electronics life extension thereby improving the reliability, functionality, and human factors of the overall plant.