AMPP Nuclear Coatings flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Service Level I coating

A coating applied to structures, systems, or components whose failure could impair safe shutdown or accident mitigation; it must be qualified by radiation and simulated design basis accident testing before use.

Service Level II coating

A coating that is not Level I but whose degradation or released debris could adversely affect a safety-related system; it must not impair Level I coatings or safety functions.

Service Level III coating

Any plant coating that is neither Level I nor Level II. Only standard industrial good practice and normal quality requirements apply, and no design basis accident qualification is needed.

Design basis accident

Postulated accident conditions, such as a loss-of-coolant accident, defined by pressure, temperature, radiation dose, and chemical spray exposure that safety-related coatings must survive without unacceptable degradation.

ASTM D3911

Standard test method that exposes coatings used in light-water nuclear plants to simulated design basis accident conditions, including temperature, pressure, and chemical spray, after prior radiation exposure.

ASTM D4082

Standard test method for evaluating effects of gamma radiation on coatings used in light-water nuclear power plants; specimens are irradiated to a plant-specified total integrated dose before accident testing.

ASTM D4256

Standard test method used to determine how readily a coating can be decontaminated; coatings in radiologically controlled areas are evaluated for ease of removing surface contamination.

Zinc-rich primer restriction

Zinc-rich primers are generally prohibited or restricted on surfaces inside PWR containment because zinc reacts with boric acid spray, forming deposits and potentially generating hydrogen.

SSPC-SP 5/NACE No. 1

White metal blast cleaning: removal of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, and inclusions, leaving a uniform gray-white surface; the highest blast cleanliness grade.

SSPC-SP 10/NACE No. 2

Near-white blast cleaning: removal of all visible oil, grease, dirt, mill scale, rust, and coating, leaving only minor staining as random streaks or shadows on at least 95 percent of the surface.

SSPC-SP 13/NACE No. 6

Concrete surface preparation standard covering methods such as abrasive blasting, scarifying, and shottracking to remove laitance, form release agents, and contaminants before coating application.

Surface profile

The roughness pattern created by abrasive blast cleaning, measured as peak-to-valley depth in micrometres or mils; it provides the mechanical key that coatings need for adhesion.

ASTM D4417

Standard test methods for field measurement of surface profile on blasted steel using a comparator disc, a depth micrometer, or replica tape; results are reported in micrometres or mils.

Bresle test

A patch method for extracting soluble salts from a steel surface, described in ISO 8502-6 and ISO 8502-9; the extract conductivity indicates chloride and total salt loading.

Dew point spread

The difference between steel surface temperature and the dew point of the surrounding air. Surface temperature must stay at least 3 degrees Celsius (5 degrees Fahrenheit) above dew point.

SSPC-SP 1 solvent cleaning

Removal of oil, grease, dirt, and other soluble contaminants by solvent, vapour, emulsion, or alkaline cleaning before abrasive blasting, preventing contamination from being driven into the steel.

Induction time

The waiting period, specified by the manufacturer, between mixing the two components of a coating and starting application, allowing the chemical reaction to begin and trapped air to escape.

Pot life

The maximum usable time after mixing a two-component coating during which it can still be applied properly; material left beyond pot life must be discarded rather than thinned.

Recoat window

The manufacturer-specified interval during which the next coat may be applied without surface preparation; exceeding it usually requires abrading the cured film to restore intercoat adhesion.

Stripe coat

A narrow brush-applied coat on edges, welds, bolt heads, and irregular areas applied before the full coat, ensuring these difficult areas receive the specified film thickness.

Amine blush

A greasy carbamate film that can form on amine-cured epoxies applied under cool, damp conditions; it must be removed before recoating or adhesion will be reduced.

Volume solids

The percentage of a coating's liquid volume that remains as dry film. Wet film thickness equals the required dry film thickness divided by the volume solids fraction.

Wet film thickness

The thickness of freshly applied coating measured with a comb or wheel gauge; it is checked during application to confirm the specified dry film thickness will be achieved.

Inorganic zinc cure

Inorganic zinc silicate coatings cure by absorbing moisture from the air; relative humidity below about 50 percent can prevent proper curing and leave the film poorly adhered.

SSPC-PA 2

Standard practice for measuring dry film thickness of coatings on steel with magnetic or eddy-current gauges, defining spot measurements, averages, gauge tolerance, and acceptance limits.

Wet sponge holiday test

A low-voltage continuity test using a wetted sponge and detector to find pinholes, voids, and thin spots in coatings up to about 500 micrometres (20 mils) thick.

ASTM D4541

Standard test method for pull-off strength of coatings using portable adhesion testers; a loading fixture is bonded to the coating and pulled until detachment, giving a quantitative result.

ASTM D3359

Standard test methods for rating adhesion by tape test after a cross-cut or X-cut pattern is made through the film; results are reported as a classification from 0 to 5.

ASTM D4537

Standard guide for establishing procedures to qualify and certify personnel who inspect coating and lining work in nuclear facilities; it defines training, experience, and examination requirements.

ASTM D7108

Standard guide for establishing qualifications for a nuclear coatings specialist, covering knowledge of nuclear coating standards, specification review, inspection, and quality assurance responsibilities.

Hold point

A designated step in a work sequence that cannot proceed until the inspector or quality assurance representative has verified the work and formally released it.

Nonconformance report

A formal record describing work that does not meet specification, such as low film thickness or a holiday, together with the disposition and the corrective action taken.