The future need for pipe repairs due to intergranular stress corrosion cracking (IGSCC) is estimated, and the repair rate is predicted to increase with plant age. The expected cost of future repairs is calculated for an average plant using a life-cycle economic model. The calculated repair cost, $8.9 million (in the absence of countermeasures) is particularly sensitive to the economic scenario, the fraction of repairs that force outages, and the average repair time. The value of an IGSCC countermeasure is equal to the reduction in repair costs that results from implementing that countermeasure. The reduction in repair cost varies linearly with effectiveness; for a 100% effective countermeasure (i.e., no future repairs), the value is $8.9 million per plant. The sensitivity of the results to several uncertainties is analyzed, leading to +470, -83% bounds on the baseline estimates.
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