Concrete component aging and its significance relative to life extension of nuclear power plants

The objectives 'of this study are to (1) expand upon the work that was initiated'in 'the first 'two Electric Power Res'earch Institute studies relaTtive td-6lbngevity and 'life extension considerations' of safety-related ;concrete' components' in 'light-' water 'reactor (LWR) facilities 'and (2)'provide background 'that will logically lead to'subsequent development:of a methodology for assessing and predicting the effects of aging on the 'per-' formance of'concrete-based materials nd components.' These objectives'are consistent with Nuclear Plant Aging Research (NPAR) Program goals't (1) to-'identify and characterize aging and service wear effects that,' if unchecked,'icould cause degradation of structures, components, and systems'and," thereby, impair plant safety; (2) to identify methods of inspection, surveillance, and monitoring'or of evaluating residual life of'structures, components, and systems that will ensure timely detection of. significant'aging effects before loss of-safety function; and-' (3) to 'evaluate -the effectiveness of 'storage' maintenance, repair, and replacement practices in mitigating-the rate and extent'of ,degradation caused by ging'and service wear. Applications of safety-related concrete 'components to LWR technology 'are 'identified, and pertinent-components (containment buildings,'containment base mats, biological shield walls and'buildings,and auxiliary buildings),'as well as the materials of which they are constructed (concrete, 'mild steel'reinforcement,' prestressing'system's, embedments, and anchorages) are described. Historical-performance of concrete components was established through information presented on concrete longevity, component behavior in both LWR and high-temperature gas-cooled reactor applications, and areview of problems with concrete components in both general civil engineering and nuclear power applications. The majority of the problems identified in conjunction with:znuclear' power applications were minor and involved either concrete cracking, concrete voids, or low -' concrete-strengths at early!.ages.Five incidences involving . LWR concretecontainments considered significant are described '*Research 'fundea by the Nuclear Regulatory Commission NPAR Program and conducted in conformance with its program goals. B . M. Morris'and J. P.'Vo'ra,1NucZear PZant Aging 'Research (NPAR) Program Plan, NUREG-1144, Division of Engineering' Technology, .'Office -of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, D.C., July 1985.

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