is selected for the officer naval nuclear power training program in connection with the supervision, operation, and maintenance of naval nuclear propulsion plants and agrees to serve, upon completion of such training, on active duty in connection with the supervision, operation, and maintenance of naval nuclear propulsion plants; or

has the current technical qualification for duty in connection with the supervision, operation, and maintenance of naval nuclear propulsion plants and agrees to remain on active duty in connection with the supervision, operation, and maintenance of naval nuclear propulsion plants.

is entitled to basic pay under section 204 of this title; and

remains on active duty for a specified period while maintaining current technical qualifications, as approved by the Secretary, for duty in connection with the supervision, operation, and maintenance of naval nuclear propulsion plants.

A nuclear officer bonus or nuclear officer incentive pay under this section may be paid in a lump sum or in periodic installments.

Upon acceptance by the Secretary concerned of the written agreement required by subsection (e), the total amount of the nuclear officer bonus to be paid under the agreement shall be fixed.

An officer who is performing obligated service under an agreement for a nuclear officer bonus may execute a new agreement to replace the existing agreement if the amount to be paid under the new agreement will be higher than the amount to be paid under the existing agreement. The period of the new agreement shall be equal to or exceed the remaining term of the period of the officer’s existing agreement. If a new agreement is executed under this paragraph, the existing agreement shall be cancelled, effective on the day before an anniversary date of the existing agreement occurring after the date on which the amount to be paid under this paragraph is increased.