Each agency shall establish and maintain such control of personal property inventories as will assure that the total cost involved will be kept to the minimum consistent with program needs. For purposes of stock replenishment, inventories may be considered to be composed of active inventory which is that portion carried to satisfy average expected demand, and safety stock which is that portion carried for protection against stock depletion occurring when demand exceeds average expected demand, or when leadtime is greater than anticipated.
41 C.F.R. §101-27.101