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          NRC Library  Document Collections  NUREG-Series Publications  Publications Prepared by NRC ContractorsStudy on Post Tensioning Methods (NUREG/CR-7208)

On this page: Publication Information AbstractDownload complete document NUREG/CR-7208 (PDF – 29.6 MB)Publication Information **Manuscript Completed:** November 2015**Date Published:** November 2015 **Prepared by:** Christopher A. Jones and Lili A. A. Heitman Sandia National Laboratories 1515 Eubank Albuquerque, NM 87123 Robert Dameron Moffatt and Nichol 1660 Hotel Circle North San Diego, CA 92108 Madhumita Sircar, NRC Project Manager and Technical Lead NRC Job Code V6186-00 Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington DC 20555-0001 Availability Notice Abstract In order to assess the effects of using grouted prestressing tendon systems in nuclear power containment vessels, a containment vessel is modeled in three dimensions using finite element analysis and different assumptions relating to grouted and ungrouted prestressing systems are applied. The particular containment vessel is the 1:4 Scale Prestressed Concrete Containment Vessel, for which extensive data exists. Such data can be used to benchmark and validate the modeling. The results from the grouted and ungrouted models indicate that greater localized maximum stresses and strains are predicted for the grouted case because the tendon system is not permitted to slip and redistribute loads as the vessel deforms. Accordingly it is noted that the analyses predict failure of the vessel at a slightly lower internal pressure in the case of the grouted system. Additionally, the response of the containment structure to tendon corrosion is investigated for both grouted and ungrouted systems while the prestressing system is subject to corrosion. Contrary to the results from the uncorroded tendon simulations, when corrosion impacts the prestressing system, the grouted system offers better performance owing to isolation of the corrosive effects and better preservation of prestressing force. A post-tensioned containment is not only subject to normal material degradation, but also to a continuous loss of prestressing force. The losses result from inherent material characteristics. Because loss of prestress is not completely predictable, loss of prestress or residual strength must be measured at regular intervals to determine the containment strength to resist accident pressure and design loads with acceptable margins. The US Nuclear Regulatory Commission and Sandia National Laboratories have investigated and documented current procedures for monitoring and evaluation of post-tensioning to verify the effectiveness of inservice inspection examination methods for grouted and ungrouted tendon systems. Questions addressed include: (1) are current inservice inspection and examination methods adequate and (2) if corrective measures are used, are they adequate. In general, nondestructive evaluation and sensing methods are the only way to monitor the structural health of grouted tendons, and improvements to available methods should be investigated. Similarly, remediation of problems such as corrosion with grouted systems is difficult. The evaluation and repair of ungrouted prestressing systems is more straightforward. 
      
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