{"slug":"/consulting/ndt-risk-assessments","title":"NDT Risk Assessments: Site Hazards and Technical Limits","description":"NDT task risk assessments for radiography controlled areas, confined space, height and hot surfaces, plus technical risk: detection limits and coverage gaps.","h1":"Risk assessments that cover both the hazard and the missed flaw","answer":"An NDT risk assessment covers two risks before work starts: harm to people, from radiation exposure, confined spaces, work at height and hot surfaces, and technical risk, where the chosen method can miss the damage it is meant to find. Atlantis prepares and reviews this documentation; radiation licensing and site HSE approval stay with the licensee and the client.","expansion":"Sites already demand a task risk assessment or job safety analysis before NDT starts, and NDT assessments fail when they are generic: a radiography sheet copied from the last job, with nothing about this job's geometry, neighbouring trades or shift pattern. Radiography needs an exposure plan and controlled-area boundaries worked out by the licensee's method for the source or tube in use; in the United States the licensee operates under the NRC or an Agreement State, and its radiation safety officer owns the radiation safety programme. Confined space entry runs under the site's permit programme. Work at height brings access, dropped-object and rescue planning. Hot surfaces bring burns and the temperature limits of couplants, penetrants and probes. The technical side asks what the chosen method can and cannot detect on this component, where coverage will fall short and what the owner should be told. Atlantis drafts and reviews those documents; it does not issue permits or act as radiation safety officer.","source":"US NRC 10 CFR Part 34 (industrial radiography) and Agreement State equivalents; OSHA 29 CFR 1910.146 and 29 CFR 1926 Subpart AA (confined spaces); OSHA 29 CFR 1926 Subpart M (fall protection); ASME BPVC Section V method articles; client site HSE and permit-to-work procedures.","table":{"caption":"What an NDT task risk assessment covers, and who owns each control","columns":["Risk","What the assessment records","Typical controls","Who approves or owns it"],"rows":[["Radiation exposure (RT)","Source or tube, exposure geometry, controlled-area boundary by the licensee's method, shift timing, neighbouring trades","Collimation, shielding, barriers and signs, survey on each exposure, night or weekend working, permit coordination","The licensee's radiation safety officer and the site permit issuer"],["Confined space","Space identification, atmospheric hazards, entry permit, attendant, rescue arrangements","Permit, gas testing, ventilation, rescue plan, limits on cables and equipment taken inside","The site's confined space programme and entry supervisor"],["Work at height","Access method, anchor points, dropped objects such as probes, cables and magnets, rescue","Tagged scaffold, harness, tool tethering, exclusion zone below","The site's access and scaffold authority"],["Hot surfaces","Expected surface temperature against consumable and probe limits; burn risk","High-temperature couplant and probes, cool-down periods, gloves, the procedure's qualified temperature range","Contractor Level III for the technical limit; site HSE for the burn hazard"],["Electrical and magnetic (MT)","Prod or yoke use, arc risk on the surface, flammable atmosphere","Yokes in place of prods where arcing is unacceptable, hot work permit where required","The site permit issuer"],["Chemical (PT and MT consumables)","Aerosol flammability, ventilation, safety data sheets, waste","Ventilation, ignition control, waste handling","Contractor, with site HSE"],["Technical: method limitation","Damage mechanism against what the method can detect and size here","Stated rationale for the method, supplementary technique where needed","Owner's inspection lead, advised by a Level III"],["Technical: coverage gap","Areas that cannot be examined because of access, geometry, insulation or surface","Coverage map, limitation statement in the report, follow-up plan","Level III; accepted by the owner"]],"note":"A risk assessment does not authorize the work. It informs the permit, and the site issues the permit."},"facets":[{"q":"What should an NDT risk assessment include?","a":"The task, location and method; the people affected, including other trades; each hazard with its controls; the permits it relies on; emergency and rescue arrangements; and a technical section stating what the method can and cannot find on this component and where coverage will be limited. It should name who prepared it, who reviewed it and which permit it supports."},{"q":"Who is responsible for radiation safety during site radiography?","a":"The radiography licensee, through its radiation safety officer and the radiographers it assigns, under its licence and the regulator's rules. The site controls the permit and coordination with other work. Atlantis can prepare or review the exposure planning documentation and the risk assessment, but it does not hold that responsibility and does not sign as radiation safety officer."},{"q":"What is technical risk in NDT?","a":"The risk that the inspection does not deliver the information the owner thinks it does: a method poorly suited to the damage mechanism, a flaw orientation the technique struggles with, a sizing limitation, or areas left unexamined. It is a risk to integrity decisions rather than to people on the day, and it belongs in the same document as the safety hazards."},{"q":"Should probability of detection figures appear in a risk assessment?","a":"Only where they exist for this technique, flaw type and condition, with the source cited. Probability of detection is measured for specific combinations, and borrowing a figure from a different study misleads. Where no data applies, describe the expected detection capability in words and say it is a Level III judgment. An invented number is worse than an honest description."},{"q":"Can a generic job safety analysis cover NDT work?","a":"It can serve as the starting template, not the finished assessment. NDT adds hazards a generic analysis misses, from radiation boundaries and UV-A lamps to magnet handling at height and couplant on walkways, and it adds the technical section no safety form asks for. The finished document has to describe this task on this component."},{"q":"Does the risk assessment change if the method changes?","a":"Yes, on both sides. Replacing radiography with ultrasonics removes the radiation hazard and the controlled area but changes the technical risk, because the two methods respond differently to flaw type and orientation. Any method substitution should reopen the assessment, and the owner should see the revised technical section before accepting the change."}],"sections":[{"heading":"Two registers in one document","paragraphs":["A complete NDT risk assessment keeps two registers. The first is familiar to every site: hazards to people from the task, its location and the work going on around it, each with controls and the permits it relies on. The second is particular to inspection: the risk that the examination gives the asset owner a false picture, because of the method's limitations, the flaw types it handles poorly or the areas it cannot reach. Site HSE reviews the first; the owner's inspection lead needs the second.","Keeping both in one document is deliberate. Many technical limitations come from the same site conditions that drive safety controls: scaffolding that limits probe access, insulation left in place, a hot surface that rules out a penetrant or couplant, a shift restriction that shortens exposure windows. When the two registers are written together, those links are visible, and a decision taken for safety reasons does not silently reduce what the inspection can find."]},{"heading":"Radiography: exposure planning and controlled areas","paragraphs":["Radiography carries the hazard that most shapes site planning. Exposure planning works out, for the source or X-ray tube, the exposure geometry, the collimation and shielding available, where the controlled-area boundary falls and how long the area will be held. Those boundaries are calculated by the licensee's method against the dose limits and boundary criteria of its licence and its regulator, and confirmed by survey with calibrated instruments once the exposure starts.","The risk assessment records what the exposure plan means for everyone else: which access routes close, which trades must stand down, whether work moves to a night shift, how barriers and signs are placed and checked, and how the area is cleared and reopened. In the United States, industrial radiography licensees work under the NRC's rules in 10 CFR Part 34 or an Agreement State's equivalent rules; elsewhere, under the national regulator's. Licensing, the radiation safety programme and dose records stay with the licensee."]},{"heading":"Confined space, height and hot surfaces from the inspection side","paragraphs":["Confined spaces, elevated work and hot equipment are governed by the site's own programmes, such as permit-required confined space entry and fall protection procedures, and the NDT assessment does not replace them. What it adds is the inspection detail those programmes do not anticipate: cables and umbilicals trailing through a manway, couplant or penetrant residue on ladders and grating, magnets and probes as dropped-object hazards, UV-A lamps that run hot, and long periods spent concentrating on a screen rather than on surroundings.","Hot surfaces deserve a technical entry as well as a safety one. Penetrants, developers, couplants and probes are made for stated temperature ranges, and a procedure qualified for one range does not cover another. Examining outside that range risks burns and an invalid examination at the same time. The assessment should record the expected surface temperature, the consumables and probes chosen for it, and the procedure range that applies, or the cool-down needed before work."]},{"heading":"Technical risk: what the method will not tell you","paragraphs":["Every NDT method has blind spots, and the asset owner deserves to see them written down. Radiography responds poorly to planar flaws not aligned with the beam. Conventional contact ultrasonics has a near-surface dead zone and relies on surface condition and access. Magnetic particle testing works only on ferromagnetic material and finds surface and near-surface flaws. Penetrant testing finds only flaws open to the surface. Visual testing finds what can be seen and lit. None of this is controversial, yet it is often absent from the documents that justify a method choice.","The technical section links the damage mechanism the owner is worried about to what the chosen technique can detect and size on this component, in this condition. Where a technique has been qualified by demonstration, that record supports the claim; see [procedure qualification by demonstration](/consulting/ndt-procedure-qualification-demonstration). Where it has not, the section should say the expected capability is a Level III judgment and explain its basis. Probability of detection figures belong only where real data applies."]},{"heading":"Coverage gaps and limitation statements","paragraphs":["Coverage is where technical risk becomes concrete. Supports, nozzles, insulation, attachments, weld caps, scaffold positions and access restrictions all leave areas that cannot be examined as planned. The risk assessment should anticipate them from drawings and a site walk-down where possible, and the plan should say what happens when they are found: a supplementary technique, removal of the obstruction, or a recorded limitation the owner accepts.","That plan then flows into the report. A report that lists indications but says nothing about coverage achieved invites the reader to assume full coverage. Limitation statements, coverage maps and a clear record of areas not examined give the owner what they need to decide on follow-up. The risk assessment is where that expectation is set before work begins, rather than argued about afterwards."]},{"heading":"Preparing versus approving: where the boundary sits","paragraphs":["Responsibilities in this area are fixed by law and contract, and the documents must respect them. The radiography licensee owns radiation safety. The site owns permits to work, confined space entry, hot work and access. The contractor owns its own task risk assessment and the competence of its people. The owner's inspection lead or integrity engineer owns the decision to accept technical limitations. A risk assessment that blurs these lines is weaker, whoever wrote it.","Atlantis's role is preparation and review. We draft task risk assessments and the technical section, review a contractor's or licensee's documents for completeness and for consistency with the procedure and the inspection plan, and identify where the technical risk needs the owner's attention. In these engagements we do not take the licensee's role, issue permits, act as radiation safety officer or approve site HSE documents on the client's behalf."]},{"heading":"What Atlantis delivers on NDT risk assessments","paragraphs":["Deliverables are a task risk assessment template built around the methods you use, completed assessments for specific jobs where you supply the site information, a technical risk section linking damage mechanisms to method capability and coverage, and a review of your existing assessments with a list of gaps. Technical content is reviewed by an ASNT NDT Level III in UT, RT, MT, PT and VT.","The best moment to involve us is at inspection planning, while method choices and access arrangements can still change. [Ask for a quote on risk assessment documentation](/contact?service=consulting&subject=NDT%20risk%20assessment) and tell us the methods, the type of site, and who holds the radiation licence and the permits on the job."]}],"faq":[{"q":"Will Atlantis act as the radiation licensee or safety officer for our job?","a":"No. The radiography contractor that performs the exposures holds the licence and runs the radiation safety programme, and the site issues the permits. We prepare or review the exposure planning documentation and the task risk assessment so that both are complete and consistent with the procedure."},{"q":"Can one risk assessment be reused across sites?","a":"The template can; the assessment cannot. Hazards, access, neighbouring work, permits and component condition change from site to site, and so does the technical risk. Reuse the structure and the method-specific content, then complete the site-specific parts afresh for every job."},{"q":"Who should review the technical risk section?","a":"A Level III certified in the method, for the technical content, and the owner's inspection lead or integrity engineer, who decides whether the stated limitations are acceptable. Record that acceptance, because it is a decision about the asset, not just about the inspection."},{"q":"When does a risk assessment need revising during the work?","a":"Whenever the conditions it assumed change: a method substitution, a change of source or equipment, new neighbouring work, a different access arrangement, or an unexpected coverage limitation. Record the revision and brief the crew before work continues, rather than relying on the original sign-off."}]}