Nuclear & Critical Infrastructure Manufacturing calculator
Configuration Control Effort Calculator
Size the change control desk before a design freeze. Enter the notices, the processing rate, the review board and record update allowance and the hours available; the page shows what fits and what spills over.
What this calculator does
- Configuration control hours for a change-notice backlog, with the review board allowance and the window explicit.
Formula used
- Base configuration control hours = notices to process ÷ notices processed per hour
- Required configuration control hours = base hours × (1 + allowance ÷ 100)
- Review board and record update hours = base hours × allowance ÷ 100
- Hours over the window = required hours − available configuration hours
- Window use = required hours ÷ available configuration hours × 100
Inputs explained
- Engineering Change Notices to Process: Open notices in the backlog, from the configuration log.
- Change Notices Processed per Hour: Average throughput once a notice reaches the queue.
- Review Board and Record Update Allowance: Uplift for board review and updates to controlled records.
- Available Configuration Hours: Configuration hours the schedule can give before the review cycle.
How to use the result
- Best suited to staffing a change board after a design freeze, forecasting backlog burn-down before a review cycle.
- A notice that triggers a full change evaluation can take far longer than the average. Upstream design and drafting time is outside these configuration hours.
Common questions
- How are configuration control hours calculated? Base hours divide the notices by the processing rate. Required hours add the review board and record update allowance. At 35 notices and 3 per hour the base is 11.67 hours; a 20% allowance takes the total to 14.
- What does the review board allowance cover? Board review, impact screening and updates to controlled records such as the document index and as-built drawings. That surrounding work is easy to leave out of a processing rate.
- What processing rate should I use? Blend the rate to the backlog: simple redlines move faster, while notices that need a full evaluation move slower. The default of three per hour suits a mixed queue; measure from recently closed notices.
- Does this include the design work behind a change? No. The page covers configuration control processing, review board and record updates only. The engineering that produces the change notice is a separate effort with its own estimates.
Last reviewed 2026-10-01.