Liquid Penetrant Testing (PT) Requirements Under NUPIC

Consumables are batch-controlled: certificates for each batch, contamination checks, and the sulphur and halogen limits where the material demands it. NUPIC, enforced by NUPIC — a committee of NRC licensees and international nuclear plant operators,.: NUPIC certifies nobody and imposes no scheme of its own.

An auditor examining PT asks for penetrant, developer, cleaner and emulsifier batch records, plus the light meters for the inspection environment. NUPIC is not a regulator and issues no certificate. It is a cost-sharing mechanism: rather than every utility auditing the same NDT vendor separately to 10 CFR 50 Appendix B, member utilities run one joint audit, and the resulting report is shared with the membership so each licensee can use it to place the supplier on its own Approved Suppliers List. NUPIC distinguishes a full audit, which examines compliance with 10 CFR 50 Appendix B, from a commercial grade survey, which assesses the critical characteristics of the components supplied. It publishes the checklists used and an annual audit and survey schedule, and its programme documents are numbered — NUPIC Document 6 describes the joint audit programme and Document 11 the implementation guidelines.

Source: NUPIC official website (nupic.com) — home page, FAQ and Documentation pages, accessed 21 Aug 2026 — for eligibility (five NRC licensee or international operator customers), sponsorship by five members, the standard 33-month audit schedule and the 36-month fuel supplier cycle, approximately five-day audit duration conducted 8am–5pm Monday to Friday, the distinction between a full audit against 10 CFR 50 Appendix B and a commercial grade survey of critical characteristics, no vendor membership fee with the sponsoring customer facility bearing audit cost, the NUPIC Audit Checklist, NUPIC Survey Checklist and Calibration Checklist, the QA manual submission facility, and the document set: NUPIC Document 6 Joint Audit Program Description, Document 10 Joint Commercial Grade Survey Program Description, Document 11 Joint Audit and Checklist Implementation Guidelines, Document 21 Commercial Grade Item Survey Implementation Guidelines, Document 29 Commercial Grade Calibration Services Implementation Guidelines, plus 2024, 2025 and 2026 audit and survey schedules and the ILAC page referencing NEI-14-05-A Rev 1 and the ILAC MRA signatory list updated August 2024. Cross-referenced to 10 CFR Part 21 and Appendix B to 10 CFR Part 50, govinfo CFR annual edition revised 1 January 2024.

Liquid Penetrant Testing under NUPIC — procedure, personnel and evidence
Item	What applies	Why it matters
Regime	Nuclear Procurement Issues Committee joint utility supplier audits and commercial grade surveys	Enforced by NUPIC — a committee of NRC licensees and international nuclear plant operators, self-governing, with audits performed by lead auditors and team members drawn from the member utilities
Method	Liquid Penetrant Testing (PT)	Needs its own procedure and its own qualified personnel
Procedure approval	The employer's Level III, qualified in this method	The signature an auditor traces
Other methods in scope	UT, PAUT, RT, MT, VT, ET	Each needs separate qualification
Renewal	Most vendors sit on NUPIC's standard 33-month audit schedule; fuel suppliers are on a 36-month cycle. Continued eligibility depends on retaining member sponsorship — an audit is arranged and paid for by the sponsoring utility facility, so a supplier that loses sponsors falls off the joint schedule and reverts to individual utility audits.	Applies to the personnel certification behind this method

Does NUPIC require a separate procedure for PT?

Yes. Every method in scope needs its own written procedure, approved by someone qualified in that method, describing technique, equipment, calibration, scanning or coverage, acceptance criteria and reporting. A single combined "NDT procedure" covering several methods is a finding under every regime that names procedures individually.

Who can approve a PT procedure under NUPIC?

A Level III qualified in PT. Because NUPIC accepts employer-based certification, that Level III may be contracted rather than employed — but their own qualification must cover PT, and an auditor will check that before accepting the signature.

What PT records does a NUPIC audit sample?

The approved procedure, the technician's PT certification on the date of work, and the equipment evidence — penetrant, developer, cleaner and emulsifier batch records, plus the light meters for the inspection environment. The auditor works backwards from a finished job, so every item has to reconcile with the report and its stated acceptance criteria.

What is the most common PT finding at audit?

Batch certificates missing for consumables used, or dwell time not recorded. It is a records failure rather than a technique failure — the examination was performed correctly and the evidence supporting it cannot be produced, which under NUPIC is recorded the same way as not having done the work.

Can a technician certified elsewhere perform PT under NUPIC?

Not automatically. Employer-based certification ends when the holder leaves, so the new employer must certify them under its own written practice. Prior training and documented experience transfer as evidence; the certificate itself does not.

What equipment evidence does PT need under NUPIC?

Calibration status traceable to the day of use, covering the instrument and its accessories — probes, cables, blocks and reference standards for ultrasonics; sources and densitometers for radiography. An in-calibration instrument with an out-of-calibration reference block fails the same way as an uncalibrated one.

How do PT requirements differ from the other methods in NUPIC?

Scope, qualification and evidence are method-specific, so the differences are real rather than administrative. NUPIC also covers UT, PAUT, RT, MT, VT, and each carries its own procedure, its own personnel qualification and its own equipment evidence.

Personnel certification for PT

NUPIC certifies nobody and imposes no scheme of its own; it verifies that the supplier's programme meets 10 CFR 50 Appendix B and whatever code the licensees invoke, which for NDT means employer-based certification under a written practice built to ASNT SNT-TC-1A or ANSI/ASNT CP-189, and to ASME Section XI where inservice inspection is in scope. An outsourced Level III can therefore own the written practice, qualify and examine personnel, and approve procedures — but NUPIC auditors will look for the employer's own certification signatures, the objective evidence behind each certification package, and documented justification that the contracted Level III is qualified for that role.