compound probability = 1 - (1 - annual probability of excedence)^n where:

• annual probability = 0.01
• n = exposure period = 10 years

by other hand Mean Recurrence Interval - MRI = Return Period = 1 / annual probability of exceedence, but only if MRI >= 10 years, if not then:

annual probability of excedence = 1-e(-1/MRI)