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R. , 1993. “Probabilistic Methods for Condition Assessment and Life Prediction of Concrete Structures in Nuclear Power Plants,” Nuc. Eng. , North-Holland, Amsterdam, The Netherlands, Vol 142, pp. 155-166. 22. Mori, Y. , 1994. “Maintaining Reliability of Concrete Structures II: Optimum Inspection/Repair Strategies,” Ibid, pp. 846-862. 23. Mori, Y. , 1994. “Maintaining Reliability of Concrete Structures I: Role of Inspec-tion/Repair,” J. of Struct. , American Society of Civil Engineers New York, New York, 120(3), pp.

4) IE-SASW method In order to predict the thickness of concrete member or to identify the defect using IE method, Pwave velocity of concrete is required. The P-wave velocity can be found as presented in Equations (1) and (2), when the boundary condition and the thickness of concrete member are predetermined. In general, however, the thickness of member such as slab and wall of building remains unknown. The concrete specimen should be extracted from the structures using core-boring machine, and substituting the height of core specimen into the equations (1) produces the P-wave velocity.

1cm, respectively. 0cm, it can be concluded that the IE-SASW method shows a good potential to identify the defect and unknown thickness of concrete member reliably. 2. Test Specimen-B The P-wave velocity of test specimen was determined by the SASW test. A test was carried out along the line where there were no defects and no rebars as designated in figure 6. SASW test was performed twice, changing the interval between source and the first receiver from 20cm to 40cm. The dispersion curves are presented in figures 9 (a) and (b).

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