not later than 90 days after the date of enactment of this section, initiate a rulemaking proceeding, including notice and opportunity for public comment, to be completed not later than 18 months after that date, to revise the design basis threats of the Commission; or

not later than 18 months after the date of enactment of this section, complete any ongoing rulemaking to revise the design basis threats.

the events of September 11, 2001;

an assessment of physical, cyber, biochemical, and other terrorist threats;

the potential for attack on facilities by multiple coordinated teams of a large number of individuals;

the potential for assistance in an attack from several persons employed at the facility;

the potential for suicide attacks;

the potential for water-based and air-based threats;

the potential use of explosive devices of considerable size and other modern weaponry;

the potential for attacks by persons with a sophisticated knowledge of facility operations;

the potential for fires, especially fires of long duration;

the potential for attacks on spent fuel shipments by multiple coordinated teams of a large number of individuals;

the adequacy of planning to protect the public health and safety at and around nuclear facilities, as appropriate, in the event of a terrorist attack against a nuclear facility; and

the potential for theft and diversion of nuclear materials from such facilities.