Meritorious conduct sentence reductions may be awarded for any of the following performances or acts:
Meritorious conduct sentence reductions must be awarded upon written recommendation of the warden and approved by the director of the department of corrections and rehabilitation on a lump sum basis resulting from separate recommendations and approvals. Such reductions may not be awarded on a continuing days-per-month basis beyond the month in which a reduction award is made. Such sentence reductions may not be granted for any month in which the performance sentence reduction under section 12-54.1-01 was withheld or forfeited.
N.D.C.C. § 12-54.1-04