We believe that the use of the significance criterion of § 197.36(a) would assure a reasonable test ofdisposal system performance throughthe period of geologic stability. We
recognize that setting forth the significance screening criterion in § 197.36(a) of our proposal as pertaining to the 10,000-year period could be construed as creating a situation in which important long-term processes could be excluded altogether from the analysis if they were not significant in the earlier period.