How do you calculate the cost of a supplier audit?

Multiply planned auditor-days by the loaded auditor day rate, then by the share of scope you are covering, and add fixed travel and reporting cost. With 12 auditor-days at $1,200/day, full 100% scope, and $3,500 fixed cost, the total is $17,900.

What is a good cost per auditor-day for a nuclear supplier audit?

In this example the effective cost per auditor-day is $1,491.67 once the $3,500 fixed travel and reporting is spread across 12 days. Loaded rates of $1,000 to $1,800 per day are typical for credentialed NQA-1 lead auditors; rates much higher usually reflect specialized weld, NDE, or commercial-grade dedication expertise.

Why is the audit scope share included?

On shared or joint audits you may only own part of the checklist. Setting scope share to 50% halves the variable cost because you are funding half the auditor effort while another party covers the rest.

Audit cost vs cost of a supplier escape?

A $17,900 audit is cheap insurance against a single counterfeit or fraudulent part (CFSI) or a non-conforming safety component reaching a plant, which can cost six figures in rework, root-cause investigation, and NRC reporting.

How many auditor-days does a requalification audit need?

A focused single-process supplier may need 3 to 5 auditor-days; a broad NQA-1 program covering design, procurement, and special processes can run 10 to 15. The 12 used here reflects a full triennial program audit with a small team.

Should I run the audit in-house or use a third party?

Compare your loaded internal day rate against an agency quote. If a NUPIC-style joint audit lets you set scope share below 1.0, the shared-cost model often beats funding the entire $14,400 variable cost yourself.

Nuclear & Critical Infrastructure Manufacturing calculator

Qualified Supplier Audit Cost Calculator

Qualified supplier audit cost is the fully-loaded price of auditing a supplier against a nuclear-grade quality program such as ASME NQA-1, 10 CFR 50 Appendix B, or a utility's approved supplier list requirements. Supplier quality engineers, procurement leads, and QA managers in nuclear and critical-infrastructure manufacturing use it to budget triennial requalification audits, source surveys, and for-cause audits. Because lead auditor time is the dominant cost driver, the figure tells you whether an audit is worth doing in-house, splitting across a third-party agency like NIAC/NUPIC, or sharing through a joint audit. Getting it right protects you from blowing the supplier-quality budget mid-fiscal-year.

What this calculator does

Estimate the cost of qualifying and auditing suppliers for nuclear and critical infrastructure work, so procurement and supplier quality teams can budget audit programs and compare audit scope.
Use it when planning a supplier qualification or surveillance audit program and you need a defensible cost across the audit days, day rate, and fixed travel and reporting cost.
It computes the total loaded cost of a supplier audit from planned auditor-days, the loaded day rate, the share of scope you are covering, and fixed travel and reporting cost.

Formula used

Variable audit cost = auditor-days planned × loaded auditor day rate × audit scope share
Total audit cost = variable audit cost + fixed travel and reporting cost

Inputs explained

Auditor-days planned:
Loaded auditor day rate:
Audit scope share:
Fixed travel and reporting cost:

How to use the result

Use it when budgeting a scheduled requalification, scoping a for-cause audit, or deciding whether to buy into a shared NUPIC-style joint audit instead of running your own.
It assumes a single blended day rate and a fixed travel figure; multi-auditor teams at different rates, overseas per-diem swings, or open findings that trigger a follow-up visit are not captured.

Common questions

How do you calculate the cost of a supplier audit? Multiply planned auditor-days by the loaded auditor day rate, then by the share of scope you are covering, and add fixed travel and reporting cost. With 12 auditor-days at $1,200/day, full 100% scope, and $3,500 fixed cost, the total is $17,900.
What is a good cost per auditor-day for a nuclear supplier audit? In this example the effective cost per auditor-day is $1,491.67 once the $3,500 fixed travel and reporting is spread across 12 days. Loaded rates of $1,000 to $1,800 per day are typical for credentialed NQA-1 lead auditors; rates much higher usually reflect specialized weld, NDE, or commercial-grade dedication expertise.
Why is the audit scope share included? On shared or joint audits you may only own part of the checklist. Setting scope share to 50% halves the variable cost because you are funding half the auditor effort while another party covers the rest.
Audit cost vs cost of a supplier escape? A $17,900 audit is cheap insurance against a single counterfeit or fraudulent part (CFSI) or a non-conforming safety component reaching a plant, which can cost six figures in rework, root-cause investigation, and NRC reporting.
How many auditor-days does a requalification audit need? A focused single-process supplier may need 3 to 5 auditor-days; a broad NQA-1 program covering design, procurement, and special processes can run 10 to 15. The 12 used here reflects a full triennial program audit with a small team.

Last reviewed 2026-05-12.