2.61 Timely assessment of cracks in steam generator tubes is important for extending the life of nuclear steam generators. Wang and Reinhardt

(J. Pressure Vessel Technology, 2003) studied the failure assessment of a steam generator tube with defects, using a finite element method.

For different percentage degraded areas (PDA)

of the steam generator tube (10% to 90% degradation), they recorded the expected finite element limit load supported. Table below gives PDA and normalized finite element limit loads.

a Describe the relation between PDA and limit load.
b Fit an appropriate model to the relationship between PDA and the limit load, using regression technique.

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PDA (%) Limit load 10 0.80 20 0.67 30 0.52 40 0.45 50 0.32 60 0.32 70 0.27 80 0.19 90 0.10