Nuclear & Critical Infrastructure Manufacturing worked example

Spare Part Obsolescence Risk with component criticality score of 4 score: a worked example

This worked example runs the spare part obsolescence risk numbers for a tougher week than the baseline: component criticality score of 4 score instead of the typical 8 score. Score the obsolescence risk of spare parts for nuclear and critical infrastructure assets, so reliability and procurement teams can rank which parts need last-time buys, requalification, or stocking first.

The inputs for this scenario

  • Component criticality score: 4 score (the input this scenario stresses; the baseline uses 8)
  • Supply availability risk score: 6 score (held at the documented default)
  • Lead-time and stocking exposure score: 5 score (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Obsolescence risk score = component criticality score × supply availability risk score × lead-time and stocking exposure score.
  • Obsolescence risk score works out to 4.95 score at these inputs, and this is the headline figure for the scenario.
  • Component criticality score works out to 4 score at these inputs.
  • Supply availability risk score works out to 6 score at these inputs.
  • Lead-time and stocking exposure score works out to 5 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where component criticality score sits at 8 score and the headline result is 6.55 score, this scenario comes in 24.43% below the baseline at 4.95 score.
  • Use it when triaging a spares catalog to decide which parts get a proactive last-time-buy, alternate qualification, or commercial-grade dedication first. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Obsolescence risk score: 4.95 score (headline result)
  • Component criticality score: 4 score
  • Supply availability risk score: 6 score
  • Lead-time and stocking exposure score: 5 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Spare Part Obsolescence Risk calculator, set component criticality score to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.