The Written Practice That Controls Every Certification Your Plant Issues

What the document has to contain before anything else

A written practice is not a policy statement; it is the operative document that authorises every NDT certification the organisation issues. At minimum it has to define its own scope — which methods and which levels the employer actually uses, and it should not list methods the plant does not perform, because listing them creates an obligation to have the whole apparatus in place. It has to state education, training and experience requirements per method and per level, and where the employer departs from the recommended values, say so plainly rather than leaving the difference to be discovered.

It has to specify training: content mapped to a topical outline, hours per method and level, and how outside courses are evaluated against that outline. It has to specify examinations: general, specific and practical, who prepares them, who administers them, who grades them, the pass thresholds and the composite requirement, and how examination material is secured. It has to specify physical requirements — near-vision acuity, colour contrast differentiation where the method depends on it, the interval, and who is permitted to administer the test. It has to state the recertification interval it adopts and the basis for recertification, whether by examination, by evidence of continuing satisfactory performance, or both.

And it has to define responsibility. What a Level I may do unsupervised, what a Level II may interpret and evaluate, what the Level III alone may approve. Who the Level III of record is and how that person qualifies. How certification is documented, where records live, how long they are retained and who controls revisions to the document itself. That last item catches plants out: a written practice sitting in a shared folder with no revision index and no approval signature is not a controlled document, whatever its contents say.

SNT-TC-1A or CP-189: the choice is not cosmetic

SNT-TC-1A is a recommended practice. It is written as guidance for employers to build their own programme, and its flexibility is deliberate — the employer decides, documents and justifies. That flexibility is the reason it dominates industrial practice and also the reason it produces weak documents in the hands of people who treat the recommendations as optional without recording why they departed from them. A practice that quietly halves a training-hour recommendation without saying so has not exercised flexibility; it has created an unexplained gap.

CP-189 is a standard, with mandatory requirements and materially less latitude, including a considerably stricter basis for who may function as Level III. Some owners specify it. Some client quality requirements flow it down without the plant noticing until an audit. The two documents are not interchangeable in a sentence: moving from one to the other changes qualification bases, examination administration and Level III requirements, and the transition is a planned project with a gap analysis, not a search-and-replace on the cover page.

There is a third layer that confuses power-plant buyers: third-party certification schemes. ISO 9712 certification is issued by an independent certification body against a scheme, not by the employer, and some European-origin owners and OEMs expect it. It does not replace an employer's written practice in a US plant working to ASME codes; it can sit alongside as accepted evidence if the practice defines how. The failure mode is a plant that collects a mix of employer certifications and third-party certificates and has written nothing about how the two relate, leaving each auditor to decide for themselves.

Who controls the practice, and what an outside Level III cannot be

The employer owns the written practice. Not the consultant who wrote it, not the contractor who supplies technicians, not the corporate office three states away unless the practice says the corporate document governs and the site has adopted it formally. Ownership means someone at the plant is accountable for its revision, its distribution and its application, and that person should be named. Practices with no named owner drift by default, because nobody is responsible for noticing that reality has moved.

Where the Level III is an outside consultant — the normal arrangement for a plant that does not need a full-time Level III in each method — the practice has to describe the arrangement rather than merely name the individual. Which decisions are delegated: procedure approval, examination preparation and grading, certification recommendation, technical rulings during outages. What remains the employer's: the certification decision itself, the training record, the deployment of the technician. How the Level III is reached when a field question arises at two in the morning during a compressed outage, and what happens if he cannot be reached.

The pattern that fails an audit is the absentee Level III: a name appearing on every certification record and every procedure approval, with no evidence in the file that the person ever observed a practical examination, reviewed a specimen set or visited the site. Auditors probe this directly, usually by asking a technician who administered his practical examination and comparing the answer with the signature. When the answer does not match, the finding is not administrative — it goes to whether the certification decisions were made by anyone qualified to make them, which puts the examinations those technicians performed into question.

What the auditor samples, and the order they do it in

Experienced auditors do not read a written practice front to back and then look for compliance. They read enough to know what the document claims, then work backwards from people. They take the outage roster or the current technician list, pick a handful of names weighted toward whoever performed the most consequential recent work, and reconstruct each person's chain of qualification from the certificate back to the paragraph that permitted it.

The chain has fixed links and each has a characteristic failure. The certificate must state method, level, dates and scope, and must match an interval the practice defines. The examination records must include general, specific and practical, graded, with the practical identifying the specimens presented and what the candidate was required to find — a bare score is the single most common weakness. Training hours must be documented with content, and where the course was external, mapped to the topical outline the practice adopts. Experience must be recorded by method in hours, not inferred from length of employment. Vision testing must be current, dated and administered by someone the practice authorises.

Only then does the auditor return to the document, and by that point they are testing specific paragraphs against specific evidence rather than reading generally. This is why polishing the language of a written practice without fixing the record-keeping behind it is wasted effort. A plainly worded practice with a complete, traceable file for every certified technician passes comfortably. An elegantly drafted practice with four names whose practical examination records show nothing but a number does not, and the finding lands on the certifications rather than the prose.

The drift that makes a sound practice fail three years later

Almost no written practice fails on the day it is written. It fails because the plant changed and the document did not. The most common form is method drift: the plant buys a phased array instrument, or starts using encoded corrosion mapping on the economizer circuits, or brings in guided wave screening for buried or insulated lines, and the practice still lists conventional UT, MT, PT and VT. Everything examined with the new technique since is, on paper, outside the certified scope. Correcting it retroactively is laborious; noticing it in advance costs one revision.

The second is people drift. The Level III of record leaves and nobody updates the document. The examination administrator changes and the new person uses a different question bank. The plant reorganises and the QA manager who owned the practice now owns something else. Each of these breaks a named responsibility that the practice asserts, and the break is invisible until somebody checks the signature against the org chart.

The third is edition drift. The jurisdiction or the client adopts a newer code edition, which references a different edition of the personnel qualification standard, and the practice still cites what it cited in 2014. The fourth, and the most consequential in power, is staffing drift: the plant moves from a permanent crew to contract labour for outage scope, and the practice — written for permanent employees who were trained and examined in-house — has nothing to say about how another employer's certification is evaluated. That single omission accounts for a large share of the findings written against power-plant NDT programmes.

Outage surge staffing: the highest-volume, least-controlled part of the programme

A gas or combined-cycle plant may certify a handful of its own technicians over a year and then accept forty contract certifications in the first week of an outage. The ratio alone explains where the risk sits. Those forty arrive with certificates issued under other employers' written practices, of varying quality, referencing editions and intervals the plant has not reviewed, and the review window is the morning of mobilisation with a critical path already running.

A written practice that handles this well says exactly what is required before a contract technician performs work: which documents are furnished, what the plant verifies and against what criteria, whether any examination is re-administered or a practical demonstration required for high-consequence scope, who signs the acceptance, and how the acceptance is recorded so it can be produced later. It also states what happens when the documents are incomplete — because the honest answer under schedule pressure is otherwise that the technician works anyway.

The practice should also address the contractor's own programme. If the contractor is performing NDT under their own written practice and their own procedures, the plant is relying on a supplier's programme and should have evaluated it — which methods, whose Level III, which procedures, qualified how. Where the work is a repair or alteration under the NBIC, the repair organisation carries its own quality system and NDT programme requirements, and the plant's verification of that is part of its own file. Doing this evaluation between outages, when there is time to read, is the difference between a supplier assessment and a signature under duress.

What changes 'adequate' in gas and combined-cycle power

Power generation applies a distinctive set of pressures to an NDT personnel programme, and it is worth being precise about which are real. No reliability standard audits NDT certification, and plants that believe otherwise sometimes build toward the wrong requirement. What actually arrives is: the jurisdictional or National Board commissioned inspector, whose interest is the boiler and pressure equipment and who will look at the qualification behind examinations supporting a repair; the NBIC requirements imposed on any organisation performing repairs or alterations, which carry their own programme obligations that the plant must verify; the insurer's boiler and machinery engineer; and client, offtaker or lender technical audits that increasingly include the inspection programme.

There is one regulatory interaction that catches combined-cycle plants specifically. Units with selective catalytic reduction store ammonia. Aqueous ammonia below the concentration threshold generally sits outside the process safety management rule; anhydrous ammonia at or above the threshold quantity does not, and the storage and supply system then falls under OSHA 29 CFR 1910.119, including its mechanical integrity provisions. That pulls inspection and testing of that equipment — and the qualification of the people performing it — into a compliance framework the rest of the plant does not sit under. Plants that switched to aqueous specifically to avoid this are common; plants that did not, and never traced the consequence into their NDT programme, are also common.

Atlantis is not a process safety management auditor and does not act as the API inspector of record. What it supplies is the NDT technical authority underneath: the written practice, procedure development and qualification, personnel certification within that practice, independent review of inspection data, and representation on technical questions when an auditor or an inspector is at the table. Where a client imposes ISO/IEC 17020 on an inspection supplier, or where a fleet that also owns nuclear assets flows 10 CFR 50 Appendix B language onto fossil procurement, those are separate frameworks that should be recognised as such rather than absorbed silently into the site practice.

How a written practice engagement runs

The work starts with a gap review against reality, not against the ideal. What methods and techniques are actually performed on site and by contractors; what the current practice says; which technicians hold which certifications and on what evidence; which procedures exist and whether they are approved by someone qualified to approve them; which client and jurisdictional requirements are flowing down. The output is an ordered list, because sequence matters — rewriting a practice before knowing what scope it must cover produces a document that needs rewriting again.

The document itself follows: methods and levels, training and experience, examinations and their administration, physical requirements, recertification, responsibilities, Level III authority and the arrangement behind it, contract personnel acceptance, records and revision control. Alongside it comes the apparatus that makes it real — examination sets built to the adopted topical outlines, practical specimens that reflect the plant's actual components rather than generic coupons, and record templates that force the fields auditors ask for instead of leaving them optional.

Then the maintenance, which is where most programmes are actually won or lost: a scheduled review before each major outage, a revision whenever a method or technique is added, and a standing technical contact for the questions that arise on the floor. Mock audits before a client or jurisdictional visit are worth more than they cost, because they find the thin link while there is still time to rebuild it. To discuss a written practice review, a CP-189 transition, or outage readiness for your certification programme, request a consultation at info@atlantisndt.com.

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