ASME NQA-1a:2009 pdf free download

ASME NQA-1a:2009 pdf free download.Quality Assurance Requirements for Nuclear Facility Applications.
304 Methods of Preservation
Items subject to deleterious corrosion shall be protected by using either contact preservatives, inert gas blankets, or vapor-proof barriers with desiccants.
304.1 Contact Preservations. Contact preservatives are compounds applied to hare metal surfaces to prevent surface corrosion during shipping and storage and generally require removal prior to installation.
The Following criteria shall be used when considering the type of contact preservative to be used:
(a) The contact preservative shall be compatible with the material on which it is applied.
(F’) Contact preservatives that are nondrying shalt require a neutral greaseproof protective wrap when packaged.
(c) The procedure for applying contact preservatives shall not require disassembly of the item nor shall it be necessary to disassemble the item at the site for complete removal, An exception would Lw for long-term storage protection to be agreed upon by the Owner, Buyer and Manufacturer.
(d) The method of contact preservative removal shaLl be accomplished with approved solvents and wiping cloths, or by flushing internal cavities with solvents that are not deleterious to the Item or other interconnecting niate,-ial. HowLvz pa.ervat.ves [or inaccessible lnide surtaces of pumps, valves, and piping for systems containing reactor coolant water shall be the water lushable Wpe.
(e) The name of th preservative used shall be provided to facilitate touch-up.
(j) When motors, pumps, turbines, etc., are shipped with oil reservoirs and bearing cavities filled with preservative oil, the item shall be so tagged and instructions for draining, flushing, refilling, and periodic rotation shall be included with the item.
(g) When it is anticipated that the item might require an extended storage period (6 months or longer), a pieservative needed for the long-term protection of the item shall be applied or arrangements shall be made to periodically reapply the preservatives.
304.2 Inert Gas Blankets. l’urging and pressurizing the interior of an item or its container, or both, with a dry inert gas provides a means of preventing moisture or corrosive atmospheres from acting on sensitive, bare metal surfaces or other materials. The item or it container shall be either evacuated prior to filling with the inert gas or adequately purged with the same gas prior to applying the gas blanket.
When inert gas blankets are used, the following criteria shall apply:
(a) Inert gas blankets shall be used only when the exterior shell of the item or its container can be tightly sealed or an inert gas blanket can otherwise be maintained.