The Commission is being asked to act on a final rule that amends Parts 50 and 52 of Title 10 of the Code of Federal Regulations. The final rule establishes regulatory requirements for nuclear power reactor applicants and licensees to mitigate beyond-design-basis events. The NRC is making generically applicable the requirements in NRC orders for mitigation of beyond-design-basis events and for reliable spent fuel pool instrumentation. This rule also addresses a number of petitions for rulemaking submitted to the NRC following the March 2011 Fukushima Dai-ichi event. This rule is applicable to power reactor licensees and power reactor license applicants. The Commission has voted to approve the publication and implementation of this final rule subject to the changes noted in the attachment.