; 126 Stat. 2175), as most recently amended by section 3135 of the National Defense Authorization Act for Fiscal Year 2016 ( Public Law 114–92 ; 129 Stat. 1207), is further amended in subsection (a) by striking 30 days and inserting 180 days . 3114. National Nuclear Security Administration personnel system (a) In general Subtitle C of the National Nuclear Security Administration Act ( 50 U.S.C. 2441 et seq.) is amended by adding at the end the following new section: 3248. Alternative personnel system (a) In general The Administrator may adapt the pay banding and performance-based pay adjustment demonstration project carried out by the Administration under the authority provided by section 4703 of title 5, United States Code, into a permanent alternative personnel system for the Administration (to be known as the National Nuclear Security Administration Personnel System ) and implement that system with respect to employees of the Administration. (b) Modifications In adapting the demonstration project described in subsection (a) into a permanent alternative personnel system, the Administrator— (1) may, subject to paragraph (2), revise the requirements and limitations of the demonstration project to the extent necessary