4.211. Materials for coverings and coatings (such as paint, sealant and epoxy resin) should be selected to ensure that they do not interfere with any normal operations or safety functions, for example by deteriorating and causing clogging of the filters of sumps, or as a result of the formation of organic iodine. Appropriate paints and coatings should be used to facilitate decontamination of the walls.

4.212. If organic liners are applied to increase the leaktightness of the containment structure, they should be selected to withstand the thermal loads and pressure loads, as well as the environmental conditions in the containment, without losing their safety function. Provision for managing the ageing of these organic liners should be made, including provision for maintenance and surveillance.

4.213. Painting and coating materials should be selected so as not to pose a fire hazard.

4.214. In the selection of painting and coating materials, consideration should be given to the effect of the dissolution of their solvents in the sump on the volatility of iodine.