Digital Instrumentation and Control Systems in Nuclear Power Plants Safety and Reliability Issues (1997) / Chapter Skim
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Pages 14-17
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As an indicator, costs of nuclear plant "safety-grade" systems and equipment can be 10 times that of the equivalent commercial quality equipment. Although this report covers applications of digital I&C systems in nuclear power plants that include all three typesthe plant monitoring systems, the plant control systems, and the plant protection and mitigation systems insofar as the USNRC, the sponsor of this study, is primarily concerned with the "safety-grade" subset of these systems, this report emphasizes this subset.
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. ,, ~ technology In nuclear plants were successful in reducing unintended plant shutdowns ("trips")
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calibration requirements and improved plant condition monitoring displays (see, e.g., Gill et al., 1994~. Applications to Nuclear Plants Figure 1-1 illustrates a modern digital I&C system applied to a nuclear power plant.
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. Although many of these retrofits have been relatively small-scale, one-for-one replacements for such components as recorders, meters, and displays, in recent years some relatively large-scale, microprocessor-based, system-level retrofits have been made (Palo Verde Nuclear Generating Station, 1993; Prairie Island Nuclear Generating Plant, 1993; Turkey Point Plant, 1990; USNRC, 1992; USNRC, 1993b)
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