The paper reviews the theory of technical evaluation of the containment and the experience of using the mobile geodetic diagnostic system at the nuclear power plant unit No. 4 of Rostov NPS. The paper considers the results of a regular built-in system designed to determine and evaluate the strain-stress state of containments during the acceptance in service, commissioning stage and operating period. A comparison with the results of the geodetic system obtained at the same stages of containment existence.

The theory of the containment technical condition estimation of NPP units is considered in the paper. The theory is that the results of a regular built-in system intended for determining and evaluation of the containment stress-strain state during the acceptance and operation period must be duplicated by the mobile geodetic system results, obtained at the same stages of the containment existence. At the same time, the proposal for applying this theory to the containments constructed in 1980-2010 has been developed. The possible initial working environment is considered and the proposals for this technique implementation are introduced in the conditions under consideration. The proposals presented provide an objective control of the containment for an unlimited period of their operation.