cracking", "prevent most cracking", or "preventing an unacceptable risk
of cracking".
"the crack" suggests that there is a crack already existing and you are
now able to prevent it. Poof!
To "prevent" is too absolute, all options have a risk of failure, even
nuclear reactors designed to hold radioactive materials with a half life
of 15,000 years, seem to only be designed for events with a recurrence
of less than 2000 years. So like everything, there is an acceptable risk
and in this case a crack, or for the reactor potentially adding to the
ever growing earth's background radiation. Its sort of ok that high
concentrations have dissipated.
Large things are understood one step at a time.
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