By 1966 it had become apparent that the industry would still be unable to obtain adequate private insurance, so the act was extended until 1976. A provision was added to the Act which prevented companies from offering certain defenses to damages claims (particularly defenses which claimed that the accident had not been their fault). A minimum time limit was also introduced (which could be surpassed by state law), giving claimants three years after discovering harm in which to make a claim. The alterations were intended to make the process of obtaining funds from reactor companies easier, and to remove discrepancies in different states where different laws applied. The new provisions only applied to incidents where a significant escape of radioactive material was deemed to have occurred (an ENO, extraordinary nuclear occurrence).