NRTS

NRTS (Not Reparable This Station) （この場所での修理不可）

NRTS is a new input variable (Parts at Site) in TEMPO that replaces the MTDs (maintenance task distribution) required in earlier versions. The sum of the maintenance task distributions for operating sites, intermediate sites and the depot, plus the condemnation rate, was required to be one. MTD is not an appropriate concept in a more flexible model such as XL where the number of support sites between an operating site and the procurement source may vary.  MTD has been replaced by NRTS in TEMPO, because NRTS, the fraction of demand not reparable this station, depends only on the site itself. There is no constraint on the sum of NRTS rates.

Conversion formulas to obtain NRTS from MTD are given under MTD.