Digital Instrumentation and Control Systems in Nuclear Power Plants Safety and Reliability Issues (1997) / Chapter Skim
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Pages 7-13
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From page 7... ...
Human Factors and Human-Machine Interfaces Issue Statement. At this time, there does not seem to be an agreed-upon, effective methodology for designers, owneroperators, maintainers, end regulators to assess the overall impact of computer-based, human-machine interfaces on human performance in nuclear power plants.
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From page 8... ...
European nuclear human factors researchers have used nuclear power plant human factors research to further a better understanding of human performance issues in both nuclear power plants and other safetycritical industries. Other safety-critical U.S.
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The lack of generically applicable regulatory requirements for digital upgrades has resulted in a case-bycase approach that has contributed to the confusion and uncertainty. This approach to reviews may have been necessary in the early phase of the transition to digital systems.
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From page 10... ...
The committee believes that defining all safety-related digital upgrades as resulting in an unreviewed safety question, as stated in the USNRC's draft generic letter of August 1992, is contrary to both the letter and spirit of 10 CFR 50.59. Conclusion 6.
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From page 11... ...
The USNRC must anticipate that the regulatory technical infrastructure will continue to be challenged by advancing digital I&C technology. The focus of the nearterm licensing effort will be on digital upgrades and certification of the advanced plants.
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From page 12... ...
Digital I&C systems offer powerful capabilities that can, however, affect nuclear power plant safety; therefore, digital systems should be treated carefully, particularly in safety-critical applications. It appears the USNRC and the nuclear power industry are moving forward with procedures, processes, and technical infrastructure needed to assure continued safe operation of the plants.
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From page 13... ...
Before proceeding to further discussion of safety systems, however, it is in order to describe the three types of I&C systems in nuclear power plants. Types of Instrumentation and Control Systems In a nuclear power plant, the I&C systems irrespective of whether they are analog or digital technology are generally grouped into three types: plant monitoring and display systems, plant control systems, and plant protection and mitigation systems.
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