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51314-4344-An Examination of the Realities of the Plant Buried Piping Environment Via Measured Potentials

Picture for An Examination of the Realities of the Plant Buried Piping Environment Via Measured Potentials
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Product Number: 51314-4344-SG
ISBN: 4344 2014 CP
Author: Peter Wood
Publication Date: 2014
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Power plants contain a complex network of buried piping composed of various materials primarily metals all electrically connected via a copper grounding grid. While the effects of mixed metal couples are a topic of discussion little has been done to examine and document their measured impact in a real-world environment. This paper will present an analysis of an extensive amount of native (static) copper/copper sulfate reference cell (CSE) potential data obtained from buried structure surveys at more than twenty nuclear plants most with existing CP systems but several without CP. By integrating this CSE potential data with detailed digitized drawings of piping and grounding systems showing buried structures by material diameter and coating type a map of the native potential landscape in nuclear power plants with respect to the buried mixed metal piping environment is developed. Statistical analyses of the distribution of native potentials will be discussed along with possible implications of these analyses for our understanding of the real-world impact of mixed metals. Suggestions for further examination of the effects of mixed metals in a plant environment will also be presented.The perspectives discussed in this paper have implications for the nuclear power plant operator especially with regard to LR-ISG-2011-03 “Final License Renewal Interim Staff Guidance” for NUREG-1801 Revision 2 (“The GALL Report”) Aging Management Program XI.M41.Note: Some of the data presented in this paper was previously presented at an EPRI CPUG meeting in February 2013. 
Power plants contain a complex network of buried piping composed of various materials primarily metals all electrically connected via a copper grounding grid. While the effects of mixed metal couples are a topic of discussion little has been done to examine and document their measured impact in a real-world environment. This paper will present an analysis of an extensive amount of native (static) copper/copper sulfate reference cell (CSE) potential data obtained from buried structure surveys at more than twenty nuclear plants most with existing CP systems but several without CP. By integrating this CSE potential data with detailed digitized drawings of piping and grounding systems showing buried structures by material diameter and coating type a map of the native potential landscape in nuclear power plants with respect to the buried mixed metal piping environment is developed. Statistical analyses of the distribution of native potentials will be discussed along with possible implications of these analyses for our understanding of the real-world impact of mixed metals. Suggestions for further examination of the effects of mixed metals in a plant environment will also be presented.The perspectives discussed in this paper have implications for the nuclear power plant operator especially with regard to LR-ISG-2011-03 “Final License Renewal Interim Staff Guidance” for NUREG-1801 Revision 2 (“The GALL Report”) Aging Management Program XI.M41.Note: Some of the data presented in this paper was previously presented at an EPRI CPUG meeting in February 2013. 
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