; (II) reactor operations engineer; (III) human factors analyst or engineer; (IV) risk and reliability analyst or engineer; (V) licensing project manager; (VI) reactor engineer for severe accidents; (VII) geotechnical engineer; (VIII) structural engineer; (IX) reactor systems engineer; (X) reactor engineer; (XI) radiation scientist; (XII) seismic engineer; and (XIII) electronics engineer; or (ii) positions to be filled by exceptionally well-qualified persons that the Chairman, subject to paragraph (5), determines are necessary to fulfill the mission of the Commission. (C) Limitations (i) In general The annual rate of basic pay for a position described in subparagraph (B) may not exceed the per annum rate of salary payable for level III of the Executive Schedule under section 5314 of title 5, United States Code. (ii) Number of positions Appointments under subparagraph (A)(ii) may be made to not more than— (I) 10 positions described in subparagraph (B)(i) per fiscal year, not to exceed a total of 50 positions; and (II) 10 positions described in subparagraph (B)(ii) per fiscal year, not to exceed a total of 50 positions. (D) Performance bonus (i) In general Subject to clauses (ii) and (iii), an employee may be paid a 1-time performance bonus in an amount not to exceed the least of— (I) $25,000; (II) the amount equal to 15 percent of the annual rate of basic pay of the person; and (III) the amount of the limitation that is applicable for a calendar year under section 5307(a)(1) of title 5, United States Code. (ii) Performance Any 1-time performance bonus under clause (i) shall be made to a person who demonstrated exceptional performance in the applicable fiscal year, including— (I) leading a project team in a timely, efficient, and predictable licensing review to enable the safe use of nuclear technology; (II) making significant contributions to a timely, efficient, and predictable licensing review to enable the safe use of nuclear technology; (III) the resolution of novel or first-of-a-kind regulatory issues