Repair of Reinforced Concrete of Existing Nuclear Power Plants (RCTG) Chiara Ferraris, NIST Nathan Sauer, SIMCO Technologies.

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Presentation transcript:

Repair of Reinforced Concrete of Existing Nuclear Power Plants (RCTG) Chiara Ferraris, NIST Nathan Sauer, SIMCO Technologies

Schedule  July 2011: TG was approved by NESCC  December 2012: Final report to ballot  Nov. 28, 2012 – January 4,2013: Ballot  January-March 2013: address comments  March 28, 2013: to NESCC for comments  April – July 2013: address comments and publication

Ballot December- January 119 comments on content (no editorial allowed) All were on missing documents and missing references. Some details were added Did not change the conclusions as presented in November

Table of content 1.Introduction 2.Objectives overview 3.Inventory of NRC documents 4.Evaluation of the concrete structure 5.Concrete repair strategy and design 6.Repair implementation 7.Monitoring quality control 8.Conclusions 9.Index of Standards documents

Objectives Categorize codes and standards related to concrete repair in NRC documents Identify relevant repair concrete codes and standards missing from the NRC documents Identify technologies and new research that could translated in to new standards and codes to be adopted by an SDO Identify new technology and research needs to fill knowledge gaps in existing concrete repair codes and standards

Overall recommendations NRC should have a mechanism to evaluate any new version of an SDO document and determine its adoption or clearly state the reason for rejection Develop a repair code specific for nuclear structures Increase/sponsor research on the effects of radiation on concrete, combined with the effect of temperature exposure over a long period of time.

Overall recommendations (2) Standardized process from NRC should be implemented to pre-approve new technology and materials (database from SAG) Develop models for prediction of service life of repairs, especially taking into account the interaction with the concrete substrate Develop models for evaluation of remaining service life of a damaged structure.

Overall recommendations (3) Develop standard test methods to evaluate a structure for repair, quality control and quality assurance.

Questions? Comments?