How do you calculate nonconformance disposition time?

Divide the number of NCRs by the dispositions completed per hour to get base hours, then multiply by one plus the engineering review allowance. For 30 NCRs at 3 per hour with a 20% allowance, base is 10 hours and required time is 12 hours.

What is a realistic disposition rate for safety-related NCRs?

Simple dispositions like return-to-supplier or scrap can run 4 to 6 per hour, but technically justified use-as-is or repair dispositions on safety-related parts often drop to 1 to 2 per hour because they need engineering analysis. The 3 per hour here reflects a mixed queue.

Why add an engineering review and corrective action allowance?

The raw disposition is only part of the work. Root-cause analysis, corrective-action documentation, and MRB concurrence add time. The 20% allowance turns 10 base hours into the 12 hours you actually need to budget.

What is a good disposition cycle time per NCR?

Cycle time depends on queue complexity, but a common target is under 30 days from NCR open to closure. This calculator sizes labor hours, not calendar days; convert by dividing required hours across available reviewer capacity.

Disposition time vs corrective action time?

Disposition resolves the specific nonconforming material; corrective action prevents recurrence. The allowance here folds in light corrective-action effort, but systemic CAPA driven by trending may warrant a separate, larger time budget.

How do I clear an NCR backlog faster?

Raise the disposition rate by pre-sorting simple scrap and return-to-supplier NCRs from complex use-as-is cases, and by giving the MRB dedicated blocks. Cutting the review allowance only works if root-cause rigor is not sacrificed.

Nuclear & Critical Infrastructure Manufacturing calculator

Nonconformance Disposition Time Calculator

Nonconformance disposition time is the engineering and quality labor required to drive a stack of nonconformance reports (NCRs) to a documented disposition: use-as-is, rework, repair, return-to-supplier, or scrap. In nuclear and critical-infrastructure manufacturing, every NCR on a safety-related part needs a technically justified disposition under 10 CFR 50 Appendix B and your NQA-1 program, so the clock includes Material Review Board time, not just a clerk's signature. QA managers and project engineers use this to size staffing, forecast when an NCR backlog clears, and protect ship dates that hinge on open dispositions. Underestimating it is how safety-related shipments slip.

What this calculator does

Estimate the labor hours needed to disposition nonconformances in nuclear and critical infrastructure manufacturing, so quality teams can plan corrective action workload and protect schedule.
Use it when a batch of nonconformance reports needs review and disposition and you need an honest estimate of the hours before they hold up shipment.
It computes the total labor hours to disposition a given number of NCRs at a known disposition rate, padded by an allowance for engineering review and corrective action.

Formula used

Base disposition hours = nonconformance reports to disposition ÷ dispositions completed per hour
Required disposition hours = base disposition hours × (1 + engineering review and corrective action allowance)

Inputs explained

Nonconformance reports to disposition:
Dispositions completed per hour:
Engineering review and corrective action allowance:

How to use the result

Use it when an NCR backlog is threatening a shipment, when staffing the Material Review Board, or when forecasting how long a quality-hold queue will take to clear.
It assumes a steady disposition rate and a single allowance percentage; a few complex use-as-is or repair dispositions requiring stress analysis or supplier coordination can consume far more time than the average implies.

Common questions

How do you calculate nonconformance disposition time? Divide the number of NCRs by the dispositions completed per hour to get base hours, then multiply by one plus the engineering review allowance. For 30 NCRs at 3 per hour with a 20% allowance, base is 10 hours and required time is 12 hours.
What is a realistic disposition rate for safety-related NCRs? Simple dispositions like return-to-supplier or scrap can run 4 to 6 per hour, but technically justified use-as-is or repair dispositions on safety-related parts often drop to 1 to 2 per hour because they need engineering analysis. The 3 per hour here reflects a mixed queue.
Why add an engineering review and corrective action allowance? The raw disposition is only part of the work. Root-cause analysis, corrective-action documentation, and MRB concurrence add time. The 20% allowance turns 10 base hours into the 12 hours you actually need to budget.
What is a good disposition cycle time per NCR? Cycle time depends on queue complexity, but a common target is under 30 days from NCR open to closure. This calculator sizes labor hours, not calendar days; convert by dividing required hours across available reviewer capacity.
Disposition time vs corrective action time? Disposition resolves the specific nonconforming material; corrective action prevents recurrence. The allowance here folds in light corrective-action effort, but systemic CAPA driven by trending may warrant a separate, larger time budget.

Last reviewed 2026-05-12.