Nuclear Security Act of 2001

Nuclear Security Act of 2001 - Amends the Atomic Energy Act of 1954 to instruct the Nuclear Regulatory Commission to: (1) establish a nuclear security force to provide for the security of sensitive nuclear facilities against the design basis threat; (2) develop and implement a security plan to ensure such facilities' security; and (3) periodically revise the design basis threat to address specified threats.

Establishes the Nuclear Security Fund to administer such programs.

Amends the Energy Reorganization Act of 1974 to establish the Operation Safeguards and Response Unit to: (1) conduct operation safeguards and response evaluations; (2) conduct emergency response exercises; and (3) establish a Mock Terrorist Team comparable to special operations forces of the Armed Forces.

Mandates establishment of: (1) an operation safeguards and response evaluation program to assess periodically the ability of each sensitive nuclear facility to defend against the design basis threat; and (2) an emergency response program to evaluate emergency response personnel ability to respond to a radiological emergency within a 50-mile radius of a sensitive nuclear facility.

Amends the Atomic Energy Act of 1954 to direct the Commission to ensure sufficient stockpiles of potassium iodide tablets to provide adequate protection to the affected population within a 50-mile radius of a sensitive nuclear facility.