Ecological Systems and Devices Annotation << Back Methods and Devices for Cleaning the Free Surface of Lead and Lead-Bismuth Heat Carriers of RU and Stands From Impurities Bokova T.A., Meluzov A.G., Volkov N.S., Sumin R.V., Pogorelov M.V., Zyryanova T.K. In fast neutron reactors cooled by heavy liquid metal coolants, there is a problem of formation of deposits: lead oxides, oxides of structural material, insoluble impurities. This type of surface contamination complicates the processes of both operation and repair of damaged parts of equipment, while reducing the effi ciency of using the reactor plant and the service life of its individual elements. The existing methods of cleaning free surfaces are the experience of operating projects with a loop layout; however, modern reactor installations are based on a tank layout, which adds new operating features that are not taken into account in the experience of previous years. The specifi c features of cleaning the HLMC circuit with a tank layout include small values of average coolant velocities, which contributes to the agglomeration of impurities, including on the free surface of the coolant, the presence of several free coolant levels. The presence of impurities on the free surface of the coolant, which are localized in the contact zones of the free surface and the devices and can lead to the destruction of protective oxide coatings of the devices and further abrasion of their material. Also, when impurities are captured in the volume of lead, contact destruction of the friction pairs of the device element and the impurity occurs. And if the methods of reducing lead oxides have been studied and are actively used in the operation of circuits with HLMC, then the methods of cleaning the free surface from impurities that cannot be restored by hydrogen at this stage require both theoretical and experimental study. Keywords: HLMC, PbBi, cleaning of free coolant surfaces, reactor plant, impurity capture, bubbling process. DOI: 10.25791/esip.10.2024.1481 Pp. 70-82.